CPC · California Plumbing Code

Which general regulations apply to storm drainage and exterior work?

For a homeowner: the California Plumbing Code requires that rain and runoff from roofs, yards and paved areas be drained to an approved storm outlet (not to the sanitary sewer). Roof drainage must have both a properly sized primary system (normally sized to a 60‑minute, 100‑year storm) and emergency secondary drainage (scuppers or secondary drains). Subsoil drains around basements must be at least 3 in diameter and discharge to an approved outlet or a sump with a pump. The uploaded CPC material includes these Chapter 11 requirements (e.g., §1101.1–§1101.12) but the specific Chapter 3 sections you listed (§311.1, §321.0, §322.0, §323.0) were not present in the files provided; if you want explicit text from those §’s, please supply the pages or I can retrieve the official text.

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Last reviewed: July 6, 2026

What the code requires — plain English

The California Plumbing Code (CPC) places storm water and exterior plumbing work under both the General Regulations chapter and the Storm Drainage chapter. The matrix in the CPC lists the Chapter 3 sections the user asked about — §311.1, §321.0, §322.0, and §323.0 — but the uploaded CPC text does not include the body text for those specific sections, so I cannot quote or ground requirements to those §’s directly from the files you provided. (The matrix that lists them is present in the file set.)

Because the actual regulatory text for those §’s was not available in the supplied files, this article instead summarizes the storm‑drain and exterior‑work requirements that are present in the retrieved CPC material that apply in practice — especially the storm drainage rules in Chapter 11 (for example §1101.1, §1101.2, §1101.3, §1101.12) — and cites those sections in the supplied files. Use this summary as the practical, code‑text grounding available in the upload; if you want a strict, section‑by‑section reading of §311.1 / §321.0 / §322.0 / §323.0 you’ll need to provide the missing pages or allow me to fetch the official text.

The single most important practical rule: drain roofs, paved areas and similar exterior surfaces to a separate storm system (or acceptable outlet) and provide primary and emergency/secondary roof drainage sized to the applicable storm event — do not put storm water into the sanitary sewer. See §1101.1, §1101.2 and §1101.3.

Requirements in detail

Scope & where the rules live

The CPC’s Chapter 11 — Storm Drainage governs materials, design, and installation of storm drainage systems; §1101.1 states this chapter’s applicability.
The CPC explicitly forbids draining storm water into sanitary sewers: §1101.3.

Note: the Chapter 3 section numbers you specified appear in the CPC matrix (Chapter 3 — General Regulations), but the uploaded file set did not include their full text for quoting; the matrix entry is evidence they exist but I cannot quote those sections themselves from your provided files.

Primary drainage — roofs, gutters and leaders

Primary roof drainage (roof drains, gutters, leaders) must be sized and located with the structural roof design and pitch in mind; unless the AHJ requires otherwise, primary systems are sized for a 60‑minute duration, 100‑year return period storm. See §1101.12.1.
Secondary (emergency) drainage is required by either scuppers/open sides or secondary roof drains; scuppers must be at least 4 inches (102 mm) high and have a width equal to the circumference of the required roof drain for the area served (§1101.12.2.1), or secondary drains must be located not less than 2 inches (51 mm) above the roof surface (§1101.12.2.2).

Subsoil drains, areaways & exterior discharge

Subsoil drains around basements/cellars/crawl spaces must be at least 3 inches (80 mm) in diameter and laid in porous material with at least 4 inches (102 mm) surround; discharge points must go to an approved outlet (storm drain, approved watercourse, street curb/gutter, alley) (§1101.6 and Table 1101.4.6).
Subsoil sump pumps: when gravity discharge isn’t possible, provide an accessible sump not less than 15 in (381 mm) diameter × 18 in (457 mm) deep with automatic pump capacity not less than 15 gpm (0.95 L/s) and discharge piping not less than 1 1/2 in (40 mm) diameter.

Materials, separation & system layout

Materials for exterior leaders, underground storm drains, and building storm sewers must comply with the CPC referenced standards and Chapter 17 material tables (§1101.4 and related tables).
Separate storm and sanitary systems are required within the building; combined systems only where a separate storm sewer is not available or by the design described for secondary drains (see §1101.2 and §1101.12).

Engineered systems, controlled flow & sizing

Controlled‑flow roof drainage and engineered systems are allowed, but have specific rules: controlled‑flow roof water depths are limited by roof rise (see Table 1105.1(1)) and scupper bottom distances are limited by Table 1105.1(2); siphonic/engineered roof systems must be designed by a registered design professional (§1105.0 and §1106.0).
Storm drainage may be sized using flow rates from Appendix D (gpm/ft²) or by allowable roof area per pipe size (Table 1103.1 / Table 1103.2); the Appendix includes a worked sizing example.

Decision‑relevant dimensions & values (quick table)

Decision element	Key value(s)	Code Reference
Minimum subsoil drain diameter	3 in (80 mm)	§1101.6
Sump min size	15 in dia × 18 in deep	§1101.6.2
Sump pump min capacity	15 gpm (0.95 L/s)	§1101.6.2
Scupper min opening height	4 in (102 mm)	§1101.12.2.1
Secondary roof drain min elevation above roof	2 in (51 mm)	§1101.12.2.2
Primary drainage design storm	60‑minute, 100‑year (unless AHJ requires otherwise)	§1101.12.1
Controlled‑flow max water depth at drain	3–6 in depending on roof rise (Table 1105.1(1))	§1105.1 / Table 1105.1(1)
Minimum distance of open discharge from property line when allowed to open area	10 ft (3048 mm)	§1101.6.5

Exceptions & special cases

One‑ and two‑family dwellings: the CPC permits storm water discharge onto flat areas (streets, lawns) provided the water flows away from the building and adjoining property and does not create a nuisance (see §1101.2).
Where gravity discharge is impossible (continuously flowing groundwater, springs), subsoil drains must discharge to a storm drain or approved water course; otherwise a sump with pump is required (§1101.6.1 and §1101.6.2).
Engineered (siphonic) systems and controlled‑flow designs are permitted but require a registered design professional and compliance with the CPC’s specific requirements (see §1106.0 and §1105.0).

Because the uploaded files do not include the text of §311.1, §321.0, §322.0, or §323.0, I cannot list any exceptions or special local amendments that those sections might contain. The CPC matrix does show those section numbers under Chapter 3, which indicates they are recognized but their text wasn’t present in the files you uploaded.

Common mistakes

Routing roof or surface storm water into the sanitary sewer (prohibited by §1101.3).
Omitting a secondary/emergency roof drainage path (scuppers or secondary drains) or undersizing scuppers/secondary drains relative to the roof area; scuppers must meet the minimum dimension rules (§1101.12.2).
Using improper materials for exterior leaders/underground storm drains (materials must comply with Chapter 17 referenced standards and §1101.4).
Failing to submit roof drainage calculations or to coordinate drains with the structural roof design when controlled‑flow or engineered systems are used (§1105.0 and §1106.0 require calculations and professional design).

Worked example — sizing a roof drain (concrete example from Appendix D method)

Scenario: You have a roof area that will be drained by a single 6‑inch roof drain. Local 60‑minute rainfall rate = 3.2 in/h and the table in Appendix D (example in CPC) gives an allowable roof area for a 6‑inch drain at 1 in/h of 21,400 ft² (this is the example the CPC uses to show interpolation). Using the Appendix D method:

Start with the allowable area for the listed pipe size at 1 in/h in the CPC table (example: 21,400 ft² for a 6‑inch drain).
Divide that 1 in/h allowable area by the local rainfall rate: 21,400 ft² ÷ 3.2 in/h = 6,688 ft². That is the allowable roof area served by that single 6‑inch drain at the local rainfall.

Notes: if your roof has controlled‑flow elements, or you use multiple drains, or if the AHJ requires a different storm event, follow the specific rules in §1103.0, §1105.0 and submit calculations as required.

Related provisions (useful CPC sections)

§1101.1 — Applicability (Storm Drainage)
§1101.2 — Where required; separate storm sewer or approved disposal; one‑ and two‑family dwelling allowance
§1101.3 — Storm water drainage to sanitary sewer prohibited
§1101.4 — Material uses for roof drains, leaders and storm piping; referenced standards
§1101.6 — Subsoil drains: size, discharge, sump and backwater valve rules
§1101.11 — Paved area drains and required outlet
§1101.12 — Roof drainage: primary and secondary drainage requirements (including scuppers and secondary drains)
§1103.0 — Sizing of leaders, conductors and storm drains; Table 1103.1/1103.2 tables for sizing (see Appendix D for methods)
§1105.0 — Controlled‑flow roof drainage (Table 1105.1(1) & (2))
§1106.0 — Engineered storm drainage systems (siphonic systems require registered design professional)

And — for the record — the CPC matrix includes the Chapter 3 entries you asked about (§311.1, §321.0, §322.0, §323.0) but the text for those sections was not present in the uploaded files I searched; the matrix entry confirms their placement but not their content in the provided extract.

Code references

Grounded in the retrieved California Plumbing Code — click a citation to read the verbatim passage:

CPC § 1101.4.2.2 High relevance — show source text
1101.4.2.2 [OSHPD 1, 2, 3, 4 & 5] ABS and PVC installations are not allowed.

1101.4.3 Leaders. Leaders installed outside shall comply with the applicable standards referenced in Table 701.2 for aboveground drain, waste, and vent pipe; aluminum sheet metal; galvanized steel sheet metal; or copper sheet metal. 1101.4.4 Underground Building Storm Drains. Underground building storm drains shall comply with the applicable standards referenced in Table 701.2 for underground drain, waste, and vent pipe. 1101.4.5 Building Storm Sewers. Building storm sewers shall comply with the applicable standards referenced in Table 701.2 for building sewer pipe. 1101.4.6 Subsoil Drains. Subsoil drains shall be open jointed, perforated, or both and constructed of materials in conformance with Table 1101.4.6.

TABLE 1101.4.6

MATERIALS FOR SUBSOIL DRAINPIPE AND FITTINGS

MATERIAL REFERENCED STANDARD(S)

PE ASTM F667

PVC ASTM D2729

Vitrified Clay (Extra strength) ASTM C4, ASTM C700

1101.5 Expansion Joints Required. Expansion joints or sleeves shall be provided where warranted by temperature variations or physical conditions. 1101.6 Subsoil Drains. Subsoil drains shall be provided around the perimeter of buildings having basements, cellars, crawl spaces, or floors below grade. Such subsoil drains shall be permitted to be positioned inside or outside of the footing, shall be of perforated or open-jointed approved drain tile or pipe, not less than 3 inches (80 mm) in diameter, and shall be laid in gravel, slag, crushed rock, approved [3] ⁄ 4 of an inch (19.1 mm) crushed, recycled glass aggregate, or other approved porous material with not less than 4 inches (102 mm) surrounding the pipe. Filter media shall be provided for exterior subsoil piping. Exception: [HCD 1 & HCD 2] Subsoil drains are mandatory only when required by the Authority Having Jurisdiction due to geological conditions.

TABLE 1101.4.6

MATERIALS FOR SUBSOIL DRAINPIPE AND FITTINGS

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STORM DRAINAGE

1101.6.1 Discharge. Subsoil drains shall be piped to a storm drain, to an approved water course, to the front street curb or gutter, to an alley, or the discharge from the subsoil drains shall be conveyed to the alley by a concrete gutter. Where a continuously flowing spring or groundwater is encountered, subsoil drains shall be piped to a storm drain or an approved water course. 1101.6.2 Sump. Where it is not possible to convey the drainage by gravity, subsoil drains shall discharge to an accessible sump provided with an approved automatic electric pump.
CPC § 1101.1 High relevance — show source text
1101.1 Applicability . . . . . . . . . . . . . . . . . .205

1101.2 Where Required . . . . . . . . . . . . . .205

1101.3 Storm Water Drainage to Sanitary Sewer Prohibited . . . . . .205

1101.4 Material Uses . . . . . . . . . . . . . . . .205

Table 1101.4.6 Materials for Subsoil Drainpipe and Fittings . . . . . . . . . . . . . . . . . .205

1101.5 Expansion Joints Required . . . . . .205

1101.6 Subsoil Drains . . . . . . . . . . . . . . .205

1101.7 Building Subdrains . . . . . . . . . . . .206

1101.8 Areaway Drains . . . . . . . . . . . . . .206

1101.9 Window Areaway Drains . . . . . . .206

1101.10 Filling Stations and Motor Vehicle Washing Establishments . . . . . . . . . . . . . . .206

1101.11 Paved Areas . . . . . . . . . . . . . . . . .206

1101.12 Roof Drainage . . . . . . . . . . . . . . .206

1101.13 Cleanouts . . . . . . . . . . . . . . . . . . .207

1101.14 Rainwater Sumps . . . . . . . . . . . . .207

1101.15 Traps on Storm Drains and Leaders . . . . . . . . . . . . . . . . . . . . .207

1101.16 Leaders, Conductors, and

Connections . . . . . . . . . . . . . . . . .207

1102.0 Roof Drains . . . . . . . . . . . . . . . . . .207

1102.1 Applications . . . . . . . . . . . . . . . . .207

1102.2 Dome Strainers Required . . . . . . .207

1102.3 Roof Drain Flashings . . . . . . . . . .207

1103.0 Size of Leaders, Conductors,

and Storm Drains . . . . . . . . . . . . .207

1103.1 Vertical Conductors and

Leaders . . . . . . . . . . . . . . . . . . . . .207

1103.2 Size of Horizontal Storm

Drains and Sewers . . . . . . . . . . . .207

1103.3 Size of Roof Gutters . . . . . . . . . . .207

1103.4 Side Walls Draining onto a Roof . . . . . . . . . . . . . . . . . .207

Table 1103.1 Sizing Roof Drains, Leaders, and Vertical Rainwater Piping . . .208

1104.0 Values for Continuous Flow . . . . .208

1104.1 General . . . . . . . . . . . . . . . . . . . . .208

1105.0 Controlled-Flow Roof

Drainage . . . . . . . . . . . . . . . . . . . .208
CPC § 1101.16 High relevance — show source text
1101.16 Leaders, Conductors, and

Connections . . . . . . . . . . . . . . . . .207

1102.0 Roof Drains . . . . . . . . . . . . . . . . . .207

1102.1 Applications . . . . . . . . . . . . . . . . .207

1102.2 Dome Strainers Required . . . . . . .207

1102.3 Roof Drain Flashings . . . . . . . . . .207

1103.0 Size of Leaders, Conductors,

and Storm Drains . . . . . . . . . . . . .207

1103.1 Vertical Conductors and

Leaders . . . . . . . . . . . . . . . . . . . . .207

1103.2 Size of Horizontal Storm

Drains and Sewers . . . . . . . . . . . .207

1103.3 Size of Roof Gutters . . . . . . . . . . .207

1103.4 Side Walls Draining onto a Roof . . . . . . . . . . . . . . . . . .207

Table 1103.1 Sizing Roof Drains, Leaders, and Vertical Rainwater Piping . . .208

1104.0 Values for Continuous Flow . . . . .208

1104.1 General . . . . . . . . . . . . . . . . . . . . .208

1105.0 Controlled-Flow Roof

Drainage . . . . . . . . . . . . . . . . . . . .208

1105.1 Application . . . . . . . . . . . . . . . . . .208

Table 1105.1(1) Controlled-Flow Maximum Roof Water Depth . . . . . . . . . . . . .209

Table 1105.1(2) Distance of Scupper Bottoms Above Roof . . . . . . . . . . . . . . . . . .209

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TABLE OF CONTENTS

1105.2 Setback Roofs . . . . . . . . . . . . . . .209

1106.0 Engineered Storm Drainage System . . . . . . . . . . . . . . . . . . . . .209

1106.1 General . . . . . . . . . . . . . . . . . . . . .209

1106.2 Siphonic Roof Drainage Systems . . . . . . . . . . . . . . . . . . . .209

1106.3 Siphonic Roof Drains . . . . . . . . . .209

1107.0 Testing . . . . . . . . . . . . . . . . . . . . .209

1107.1 Testing Required . . . . . . . . . . . . .209

1107.2 Methods of Testing Storm Drainage Systems . . . . . . . . . . . .209

Table 1103.2 Sizing of Horizontal Rainwater Piping . . . . . . . . . . . . .210

Table 1103.3 Size of Gutters . . . . . . . . . . . . . . .211
CPC § 1.11.0. High relevance — show source text
This state agency does not adopt sections identified with the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.0.

2025 CALIFORNIA PLUMBING CODE 395

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APPENDIX D

SIZING STORM WATER DRAINAGE SYSTEMS

The provisions contained in this appendix are not mandatory unless specifically adopted by a state agency, or referenced in the adopting ordinance.

D 101.0 General.

D 101.1 Applicability. This appendix provides general guidelines for the sizing of storm water drainage systems based on maximum rates of rainfall for various cities. The rainfall rates in Table D 101.1 shall be permitted to be used for design unless higher values are established locally.

D 102.0 Sizing by Flow Rate. D 102.1 General. Storm drainage systems shall be permitted to be sized by storm water flow rates, using the gallons per minute per square foot [(L/s)/m [2] ] of rainfall listed in Table D 101.1 for the local area. Multiplying the listed gallons per minute per square foot [(L/s)/m [2] ] by the roof area being drained (in square feet) (m [2] ) by each inlet produces the gallons per minute (gpm) (L/s) of required flow for sizing each drain inlet. The flow rates shall be permitted to be added to determine the flows in each of the drainage systems. Required pipe sizes for various flow rates are listed in Table 1103.1 and Table 1103.2.

D 103.0 Sizing by Roof Area. D 103.1 General. Storm drainage systems shall be permitted to be sized using the roof area served by each of the

drainage systems. Maximum allowable roof areas with various rainfall rates are listed in Table 1103.1 and Table 1103.2, along with the required pipe sizes. By using this method, it shall be permitted to interpolate between two listed rainfall rate columns (inches per hour) (mm/h). To determine the allowable roof area for a listed pipe size at a listed slope, divide the allowable square feet (m [2] ) of the roof for a 1 inch per hour (in/h) (25.4 mm/h) rainfall rate by the listed rainfall rate for the local area. For example, the allowable roof area for a 6 inch (150 mm) drain at [1] ⁄ 8 inch per foot (10.4 mm/m) slope with a rainfall rate of 3.2 in/h (81 mm/h) is 21 400/3.2 = 6688 square feet (621.3 m [2] ).

D 104.0 Capacity of Rectangular Scuppers. D 104.1 General. Table D 104.1 lists the discharge capacity of rectangular roof scuppers of various widths with various heads of water. The maximum allowable level of water on the roof shall be obtained from the registered design professional, based on the design of the roof.

TABLE D 101.1
CPC § 4.2.1 High relevance — show source text
4|X|||X|X|||||X||X|X|X|X|||||||||| |1101.4.2.1||||X||||||||||||||||||||| |1101.4.2.2||||||||||X||X|X|X|X|||||||||| |1101.6_ Exception_||||X|X||||||||||||||||||||

This state agency does not adopt sections identified with the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.0.

2025 CALIFORNIA PLUMBING CODE 203

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CHAPTER 11

STORM DRAINAGE

1101.0 General.

1101.1 Applicability. This chapter shall govern the materials, design, and installation of storm water drainage systems. 1101.2 Where Required. Roofs, paved areas, yards, courts, courtyards, vent shafts, light wells, or similar areas having rainwater, shall be drained into a separate storm sewer system, or into a combined sewer system where a separate storm sewer system is not available, or to some other place of disposal satisfactory to the Authority Having Jurisdiction. In the case of one- and two-family dwellings, storm water shall be permitted to be discharged on flat areas, such as streets or lawns, so long as the storm water shall flow away from the building and away from adjoining property, and shall not create a nuisance. 1101.3 Storm Water Drainage to Sanitary Sewer Pro- hibited. Storm water shall not be drained into sewers intended for sanitary drainage. 1101.4 Material Uses. Pipe, tube, and fittings conveying rainwater shall be of such materials and design as to perform their intended function to the satisfaction of the Authority Having Jurisdiction. Conductors within a vent or shaft shall be of cast-iron, galvanized steel, wrought iron, copper, copper alloy, lead, Schedule 40 ABS DWV, Schedule 40 PVC DWV, stainless steel 304 or 316L [stainless steel 304 pipe and fittings shall not be installed underground and shall be kept not less than 6 inches (152 mm) aboveground], or other approved materials, and changes in direction shall be in accordance with the requirements of Section 706.0. ABS and PVC DWV piping installations shall be installed in accordance with applicable standards referenced in Chapter 17 and the firestop protection requirements in the California Building Code . Except for individual single-family dwelling units, materials exposed within ducts or plenums shall have a flame-spread index of not more than 25 and a smoke-developed index of not more than 50, where tested in accordance with ASTM E84 or UL 723. Plastic piping installed in plenums shall be tested in accordance with all requirements of ASTM E84 or UL 723. Mounting methods, supports and sample sizes of materials for testing that are not specified in ASTM E84 or UL 723 shall be prohibited.
CPC § 1103.1 High relevance — show source text
(3) Not less than two drains shall be installed in roof areas of 10 000 square feet (929 m [2] ) or less, and not less than one additional drain shall be installed for each 10 000 square feet (929 m [2] ) of roof area exceeding 10 000 square feet (929 m [2] ). (4) Each roof drain shall have a precalibrated, fixed (nonadjustable), and proportional weir (notched) in a standing water collar inside the strainer. No mechanical devices or valves shall be permitted. (5) Pipe sizing shall be based on the pre-calibrated rate of flow (gpm) (L/s) of the pre-calibrated weir for the maximum allowable water depth, and Table 1103.1 and Table 1103.2.

(6) The height of stones or other granular material above the waterproofed surface shall not be considered in water depth measurement, and the roof surface in the vicinity of the drain shall not be recessed to create a reservoir.

(7) Roof design, where controlled-flow roof drainage is used, shall be such that the design roof live load is not less than 30 lb/ft [2] (146 kg/m [2] ) to provide a safety factor exceeding the 15 lb/ft [2] (73 kg/m [2] ) represented by the depth of water stored on the roof in accordance with Table 1105.1(1). (8) Scuppers shall be provided in parapet walls. The distance of scupper bottoms above the roof level at the drains shall not exceed the maximum distances specified in Table 1105.1(2).

(9) Scupper openings shall be not less than 4 inches (102 mm) high and have a width equal to the circumference of

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STORM DRAINAGE

the roof drain required for the area served, sized in accordance with Table 1103.1.

(10)Flashings shall extend above the top of the scuppers.

(11)At a wall or parapet, 45 degree (0.79 rad) cants shall be installed.

(12)Separate storm and sanitary drainage systems shall be provided within the building.

(13)Calculations for the roof drainage system shall be submitted along with the plans to the Authority Having Jurisdiction for approval.

TABLE 1105.1(1) CONTROLLED-FLOW MAXIMUM ROOF WATER DEPTH

ROOF RISE*
(inches) MAXIMUM WATER DEPTH AT
DRAIN
(inches)

Flat 3

2 4

4 5

6 6

For SI units: 1 inch = 25.4 mm
- Vertical measurement from the roof surface at the drain to the highest point of the roof surface served by the drain, ignoring a local depression immediately adjacent to the drain.
TABLE 1105.1(2) DISTANCE OF SCUPPER BOTTOMS ABOVE ROOF

MATERIAL	REFERENCED STANDARD(S)
PE	ASTM F667
PVC	ASTM D2729
Vitrified Clay (Extra strength)	ASTM C4, ASTM C700

ROOF RISE* (inches)	MAXIMUM WATER DEPTH AT DRAIN (inches)
Flat	3
2	4
4	5
6	6

CPC § 1101.4 High relevance — show source text

(Matrix Adoption Tables are non-regulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)

Adopting Agency	BSC	BSC- CG	SFM	HCD	Col6	Col7	DSA	Col9	Col10	OSHPD	Col12	Col13	Col14	Col15	Col16	Col17	BSCC	DPH	AGR	DWR	CEC	CA	SL	SLC
Adopting Agency	BSC	BSC- CG	SFM	1	2	1-AC	AC	SS	SS/CC	1	1R	2	3	4	5	6	6	6	6	6	6	6	6	6
Adopt Entire Chapter								X			X					X
Adopt Entire Chapter as amended (amended sections listed below)	X			X	X					X		X	X	X	X
Adopt only those sections that are listed below
Chapter/Section
1101.4	X			X	X					X		X	X	X	X
1101.4.2.1				X
1101.4.2.2										X		X	X	X	X
1101.6_ Exception_				X	X

This state agency does not adopt sections identified with the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.0.

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CHAPTER 11

STORM DRAINAGE

1101.0 General.

1101.1 Applicability. This chapter shall govern the materials, design, and installation of storm water drainage systems. 1101.2 Where Required. Roofs, paved areas, yards, courts, courtyards, vent shafts, light wells, or similar areas having rainwater, shall be drained into a separate storm sewer system, or into a combined sewer system where a separate storm sewer system is not available, or to some other place of disposal satisfactory to the Authority Having Jurisdiction.

CPC § 901.0 Medium relevance — show source text
APPENDIX Q

Q 901.0 Sanitary Drainage and Indirect Wastes. Q 901.1 General. Sanitary drainage shall be in accordance with Chapter 7. Indirect wastes shall be in accordance with Chapter 8. The drainage system shall be compatible with the discharge liquid waste.

Q 901.2 Hazardous Materials. Hazardous materials shall not be discharged into the sanitary sewer, storm drain, or on the ground. Q 901.3 Agricultural Water Waste. Agricultural water shall be discharged in accordance with the local, state, and federal regulations as approved by the Authority Having Jurisdiction. Where agricultural water discharges to the outdoors, and is not connected to the sanitary sewer, the piping shall be installed as to restrict rodents or vermin from entering the building. Q 901.4 Floor Drains, Floor Sinks, and Receptors. Wastewater shall discharge into an approved receptor. Receptors shall be compatible with the wastewater and installed in accordance with this code.

Q 901.4.1 Plant Storage Areas. Where drains are provided in spaces where plants are stored, such drains shall be installed with indirect waste piping. Each indirect waste pipe from plant storage areas shall be separately piped to the indirect waste receptor and shall not combine with other indirect waste pipes.

Q 1001.0 Facilities.

Q 1001.1 Toilet Facilities. Toilet facilities shall be provided in accordance with the occupancy type.

Q 1001.2 Location. Toilet facilities shall be located in such a manner to prevent contamination of plants during harvesting, holding, manufacturing/processing, and packing.

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CALIFORNIA PLUMBING CODE – MATRIX ADOPTION TABLE

APPENDIX R - TINY HOUSES

(Matrix Adoption Tables are non-regulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)
CPC § 1105.1 Medium relevance — show source text
Table 1105.1(2) Distance of Scupper Bottoms Above Roof . . . . . . . . . . . . . . . . . .209

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TABLE OF CONTENTS

1105.2 Setback Roofs . . . . . . . . . . . . . . .209

1106.0 Engineered Storm Drainage System . . . . . . . . . . . . . . . . . . . . .209

1106.1 General . . . . . . . . . . . . . . . . . . . . .209

1106.2 Siphonic Roof Drainage Systems . . . . . . . . . . . . . . . . . . . .209

1106.3 Siphonic Roof Drains . . . . . . . . . .209

1107.0 Testing . . . . . . . . . . . . . . . . . . . . .209

1107.1 Testing Required . . . . . . . . . . . . .209

1107.2 Methods of Testing Storm Drainage Systems . . . . . . . . . . . .209

Table 1103.2 Sizing of Horizontal Rainwater Piping . . . . . . . . . . . . .210

Table 1103.3 Size of Gutters . . . . . . . . . . . . . . .211

CHAPTER 12 FUEL GAS PIPING . . . . . . . . . . .213

1201.0 General . . . . . . . . . . . . . . . . . . . . .215

1201.1 Applicability . . . . . . . . . . . . . . . . . .215

1202.0 Coverage of Piping System . . . . .215

1202.1 General . . . . . . . . . . . . . . . . . . . . .215

1202.2 Piping System Requirements . . . .215

1202.3 Applications . . . . . . . . . . . . . . . . .215

1203.0 Inspection . . . . . . . . . . . . . . . . . . .215

1203.1 Inspection Notification . . . . . . . . .215

1203.2 Excavation . . . . . . . . . . . . . . . . . .215

1203.3 Type of Inspections . . . . . . . . . . .215

1203.4 Inspection Waived . . . . . . . . . . . .216

1204.0 Certificate of Inspection . . . . . . . .216

1204.1 Issuance . . . . . . . . . . . . . . . . . . . .216

1204.2 Gas Supplier . . . . . . . . . . . . . . . . .216

1204.3 Unlawful . . . . . . . . . . . . . . . . . . . .216

1205.0 Authority to Render Gas Service . . . . . . . . . . . . . . . . . . . . .216

1205.1 Authorized Personnel . . . . . . . . . .216
CPC § 1103.1. Medium relevance — show source text
(9) Scupper openings shall be not less than 4 inches (102 mm) high and have a width equal to the circumference of

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STORM DRAINAGE

the roof drain required for the area served, sized in accordance with Table 1103.1.

(10)Flashings shall extend above the top of the scuppers.

(11)At a wall or parapet, 45 degree (0.79 rad) cants shall be installed.

(12)Separate storm and sanitary drainage systems shall be provided within the building.

(13)Calculations for the roof drainage system shall be submitted along with the plans to the Authority Having Jurisdiction for approval.

TABLE 1105.1(1) CONTROLLED-FLOW MAXIMUM ROOF WATER DEPTH

ROOF RISE*
(inches) MAXIMUM WATER DEPTH AT
DRAIN
(inches)

Flat 3

2 4

4 5

6 6

For SI units: 1 inch = 25.4 mm
- Vertical measurement from the roof surface at the drain to the highest point of the roof surface served by the drain, ignoring a local depression immediately adjacent to the drain.
TABLE 1105.1(2) DISTANCE OF SCUPPER BOTTOMS ABOVE ROOF

ROOF RISE*
(inches) ABOVE ROOF LEVEL
AT DRAIN
(inches)

Flat 3

2 4

4 5

6 6

For SI units: 1 inch = 25.4 mm
- Vertical measurement from the roof surface at the drain to the highest point of the roof surface served by the drain, ignoring a local depression immediately adjacent to the drain.
1105.2 Setback Roofs. Drains on setback roofs shall be permitted to be connected to the controlled-flow drainage systems provided:

(1) The setback is designed for storing water, or

(2) The square footage of the setback drainage area is converted as outlined in Section 1105.0 to gpm, and the storm-water pipe sizes in the controlled-flow system are based on the sum of the loads.

(3) The branch from each of the roof drains that are not provided with controlled flow shall be sized in accordance

with Table 1103.1.

1106.0 Engineered Storm Drainage System. 1106.1 General. The design and sizing of a storm drainage system shall be permitted to be determined by accepted engineering practices. The system shall be designed by a regis

TABLE 1105.1(1) CONTROLLED-FLOW MAXIMUM ROOF WATER DEPTH

For SI units: 1 inch = 25.4 mm
- Vertical measurement from the roof surface at the drain to the highest point of the roof surface served by the drain, ignoring a local depression immediately adjacent to the drain.
TABLE 1105.1(2) DISTANCE OF SCUPPER BOTTOMS ABOVE ROOF

For SI units: 1 inch = 25.4 mm
CPC § 1101.11 Medium relevance — show source text
1101.11 Paved Areas. Where the occupant creates surface water drainage, the sumps, gratings, or floor drains shall be piped to a storm drain or an approved water course. 1101.12 Roof Drainage. Roof drainage shall comply with Section 1101.12.1 and Section 1101.12.2.

1101.12.1 Primary Roof Drainage. Roof areas of a building shall be drained by roof drains or gutters. The location and sizing of drains and gutters shall be coordinated with the structural design and pitch of the roof. Unless otherwise required by the Authority Having Jurisdiction, roof drains, gutters, vertical conductors or leaders, and horizontal storm drains for primary drainage shall be sized based on a storm of 60 minutes duration and 100 year return period. Refer to Table D 101.1 (in Appendix D) for 100 years, 60-minute storms at various locations. 1101.12.2 Secondary Drainage. Secondary (emergency) roof drainage shall be provided by one of the methods specified in Section 1101.12.2.1 or Section 1101.12.2.2.

1101.12.2.1 Roof Scuppers or Open Side. Secondary roof drainage shall be provided by an opensided roof or scuppers where the roof perimeter construction extends above the roof in such a manner that water will be entrapped. An open-sided roof or scuppers shall be sized to prevent the depth of ponding water from exceeding that for which the roof was designed as determined by Section 1101.12.1. Scupper openings shall be not less than 4 inches (102 mm) high and have a width equal to the circumference of the roof drain required for the area served, sized in accordance with Table 1103.1.

1101.12.2.2 Secondary Roof Drain. Secondary roof drains shall be provided. The secondary roof drains shall be located not less than 2 inches (51 mm) above the roof surface. The maximum height of the roof drains shall be a height to prevent the depth of ponding water from exceeding that for which the roof was designed as determined by Section 1101.12.1. The secondary roof drains shall connect to a piping system in accordance with Section 1101.12.2.2.1 or Section 1101.12.2.2.2.

1101.12.2.2.1 Separate Piping System. The secondary roof drainage system shall be a

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STORM DRAINAGE

separate system of piping, independent of the primary roof drainage system. The discharge shall be above grade, in a location observable by the building occupants or maintenance personnel. Secondary roof drain systems shall be sized in accordance with Section 1101.12.1

based on the rainfall rate for which the primary system is sized. 1101.12.2.2.2 Combined System. The secondary roof drains shall connect to the vertical piping of the primary storm drainage conductor downstream of the last horizontal offset located below the roof. The primary storm drainage system shall connect to the building storm water that connects to an underground public storm sewer. The combined secondary and primary roof drain systems shall be sized in accordance with Section 1103.0 based on double the rain fall rate for the local area.
CPC § 312.0 Medium relevance — show source text
312.0 Protection of Piping, Materials, and Structures

314.0 Trenching, Excavation, and Backfill

701.3 Drainage Fittings

705.5.1.1 Butt Fusion Joints

705.5.1.2 Electro-Fusion Joints

705.5.1.3 Socket-Fusion Joints

723.0 Building Sewer Test

TABLE 1

CLEANOUTS (See Section 4.6.1)

The following standards from Tables 1701.1 and 1701.2 of the 2024 Uniform Plumbing Code apply.

Table 1701.1 Standards

ASTM D2239 Polyethylene (PE) Plastic Pipe (SIDRPR) Based on Controlled Inside Diameter

ASTM D2683 Socket-Type Polyethylene Fittings for Outside Diameter-Controlled Polyethylene Pipe and Tubing

ASTM D3261 Butt Heat Fusion Polyethylene (PE) Plastic Fittings for Polyethylene (PE) Plastic Pipe and Tubing

ASTM F714 Polyethylene (PE) Plastic Pipe (DRPR) Based on Outside Diameter

ASTM F894 Polyethylene (PE) Large Diameter Profile Wall Sewer and Drain Pipe

ASTM F1055 Electrofusion Type Polyethylene Fittings for Outside Diameter Controlled Polyethylene and Crosslinked Polyethylene (PEX) Pipe and Tubing

ASTM F2620 Heat Fusion Joining of Polyethylene Pipe and Fittings

Table 1701.2 Standards

ASTM D2657 Heat Fusion Joining of Polyolefin Pipe and Fittings

IAPMO PS 25 Metallic Fittings for Joining Polyethylene Pipe for Water Service and Yard Piping

Note: For SI units: 1 inch = 25 mm

2025 CALIFORNIA PLUMBING CODE 453

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"The information contained in this appendix is not part of this American National Standard (ANS) and has not been processed in accordance with ANSI's requirements for an ANS. As such, this appendix may contain material that has not been subjected to public review or a consensus process. In addition, it does not contain requirements necessary for conformance to the standard."

The following IAPMO Installation Standard is included here for the convenience of the users of the Uniform Plumbing Code. It is not considered as a part of the Uniform Plumbing Code unless formally adopted as such. This Installation Standard is an independent, stand-alone document published by the International Association of Plumbing and Mechanical Officials and is printed herein by the expressed written permission of IAPMO.

INSTALLATION STANDARD FOR PEX TUBING SYSTEMS

FOR HOT- AND COLD-WATER DISTRIBUTION

IAPMO IS 31-2022

The provisions contained in this appendix are not mandatory unless specifically adopted by a state agency, or referenced in the adopting ordinance.

1 Scope

1.1 General

1.1.1 This Standard specifies requirements for the installation of SDR 9 CTS crosslinked polyethylene (PEX) tubing and fittings, including cold-expansion, crimp, press, and mechanical compression fittings, intended for hot- and cold-water distribution systems within buildings.

1.1.2 This Standards applies to
California Plumbing Code Medium relevance — show source text

18
45
59
70
80
104|587
432
421
405
389
374
346|336
280
273
261
249
237
219|0
27
58
77
90
102
131|853
613
600
580
560
542
507|475
394
385
371
357
343
321| |50|0
2
5
10
15
20
30|0
8
20
26
59
NA
NA|101
86
82
76
70
NA
NA|67
61
NA
NA
NA
NA
NA|0
11
27
35
42
50
69|216
183
177
168
158
149
131|134
122
119
114
NA
NA
NA|0
14
35
45
54
63
84|397
320
312
299
287
275
250|232
206
200
190
180
169
NA|0
15
43
56
66
76
99|633
497
487
471
455
440
410|363
314
308
298
288
278
259|0
22
55
73
85
97
123|932
715
702
681
662
642
605|518
445
438
426
413
401
376| |100|0
2
5
10
15
20
30
50|NA
NA
NA
NA
NA
NA
NA
NA|NA
NA
NA
NA
NA
NA
NA
NA|NA
NA
NA
NA
NA
NA
NA
NA|0
10
26
33
40
47
NA
NA|218
194
189
182
174
166
NA
NA|NA
NA
NA
NA
NA
NA
NA
NA|0
12
33
43
50
59
78
NA|407
354
347
335
321
311
290
NA|NA
NA
NA
NA
NA
NA
NA
NA|0
13
40
53
62
71
92
147|665
566
557
542
528
513
483
428|400
375
369
361
353
344
NA
NA|0
CPC § 1.2 Medium relevance — show source text
ASSEMBLY,
OR METHOD1|APPLICABLE
STANDARDS|POLLUTION
(LOW HAZARD)|POLLUTION
(LOW HAZARD)|CONTAMINATION
(HIGH HAZARD)|CONTAMINATION
(HIGH HAZARD)**|INSTALLATION2,3| |DEVICE, ASSEMBLY,
OR METHOD1|APPLICABLE
STANDARDS|BACK-
SIPHONAGE|BACK-
PRESSURE|BACK-
SIPHONAGE|BACK-
PRESSURE|BACK-
PRESSURE| |Air gap|ASME
A112.1.2|X|––|X|––|See Table 603.3.1 in this chapter.| |Air gap fittings for use
with plumbing fixtures,
appliances, and appurte-
nances|ASME
A112.1.3|X|––|X|––|Air gap fitting is a device with an internal air
gap, and typical installation includes
plumbing fixtures, appliances, and
appurtenances. The critical level shall not be
installed below the flood level rim.| |Antisiphon fill valve
(ballcocks) for gravity
water closet flush tanks
and urinal tanks|ASSE 1002/
ASME
A112.1002/
CSA B125.12|X|––|X|––|Installation of gravity water closet flush tank
and urinal tanks with the fill valve installed
with the critical level not less than 1 inch
above the opening of the overflow pipe.4,5| |Atmospheric vacuum
breaker (consists of a
body, checking member
and atmospheric port)|ASSE 1001 or
CSA B64.1.1|X|––|X|––|Upright position. Have outlet open to
atmosphere. Minimum of 6 inches or listed
distance above all downstream piping and
flood level rim of receptor.4,5| |Backflow preventer for
Carbonated Beverage
Dispensers (two inde-
pendent check valves
with a vent to the atmos-
phere)|ASSE 1022|X|X|X|X|Installation includes carbonated beverage
machines or dispensers. These devices
operate under intermittent or continuous
pressure conditions.| |Backflow preventer with
intermediate atmos-
pheric vent|ASSE 1012|X|X|—|—|Installation of potable water connections to
water boilers. No high-hazard chemicals
shall be introduced into the system using
such devices. Designed to operate under con-
tinuous pressure conditions. May discharge
water.| |Backflow preventer with
intermediate atmospheric
vent and pressure reduc-
ing valve|ASSE 1081|X|X|—|—|Installation of potable water connections to
water boilers. No high-hazard chemicals
shall be introduced into the system using
such devices. Designed to operate under con-
tinuous pressure conditions. May discharge
water.
California Plumbing Code Medium relevance — show source text

(feet)|LATERAL
L
(feet)|FAN|FAN|NAT|FAN|FAN|NAT|FAN|FAN|NAT|FAN|FAN|NAT|FAN|FAN|NAT| |HEIGHT
H
(feet)|LATERAL
L
(feet)**|Min|Max|Max|Min|Max|Max|Min|Max|Max|Min|Max|Max|Min|Max|Max| |6|0
2
4
6|0
178
242
276|2983
1769
1761
1753|1530
1170
1160
1150|0
225
300
341|3802
2250
2242
2235|1960
1480
1475
1470|0
296
390
437|4721
2782
2774
2767|2430
1850
1835
1820|0
360
469
523|5737
3377
3370
3363|2950
2220
2215
2210|0
426
555
618|6853
4030
4023
4017|3520
2670
2660
2650| |8|0
2
5
8|0
168
251
289|3399
2030
2013
2000|1740
1340
1330
1320|0
212
311
354|4333
2584
2563
2552|2220
1700
1685
1670|0
278
398
450|5387
3196
3180
3163|2750
2110
2090
2070|0
336
476
537|6555
3882
3863
3850|3360
2560
2545
2530|0
401
562
630|7838
4634
4612
4602|4010
3050
3040
3030| |10|0
2
5
10|0
161
243
298|3742
2256
2238
2209|1925
1480
1461
1430|0
202
300
364|4782
2868
2849
2818|2450
1890
1871
1840|0
California Plumbing Code Medium relevance — show source text

(feet)|LATERAL
L
(feet)**|Min|Max|Max|Min|Max|Max|Min|Max|Max|Min|Max|Max| |6|0
2
4
6|211
201
237
263|695
423
416
409|369
284
277
271|267
251
295
327|894
541
533
526|469
368
360
352|371
347
409
449|1118
673
664
656|569
453
443
433|537
498
584
638|1639
979
971
962|849
648
638
627| |8|0
2
5
8|206
197
245
280|777
482
470
458|414
321
311
300|258
246
305
344|1002
617
604
591|536
417
404
392|360
339
418
470|1257
768
754
740|658
513
500
486|521
486
598
665|1852
1120
1104
1089|967
743
730
715| |10|0
2
5
10|202
193
241
296|844
531
518
497|449
354
344
325|253
242
299
363|1093
681
667
643|584
456
443
423|351
332
409
492|1373
849
834
808|718
559
544
520|507
475
584
688|2031
1242
1224
1194|1057
848
825
788| |15|0
2
5
10
15|195
187
231
284
334|966
631
616
592
568|523
413
400
381
367|244
232
287
349
404|1259
812
795
768
742|681
543
526
501
484|336
319
392
470
540|1591
1015
997
966
937|838
673
657
628
601|488
457
562
664
750|2374
1491
1469
1433
1399|1237
983
963
928
894| |20|0
2
5
California Plumbing Code Medium relevance — show source text

426
555
618|6853
4030
4023
4017|3520
2670
2660
2650| |8|0
2
5
8|0
168
251
289|3399
2030
2013
2000|1740
1340
1330
1320|0
212
311
354|4333
2584
2563
2552|2220
1700
1685
1670|0
278
398
450|5387
3196
3180
3163|2750
2110
2090
2070|0
336
476
537|6555
3882
3863
3850|3360
2560
2545
2530|0
401
562
630|7838
4634
4612
4602|4010
3050
3040
3030| |10|0
2
5
10|0
161
243
298|3742
2256
2238
2209|1925
1480
1461
1430|0
202
300
364|4782
2868
2849
2818|2450
1890
1871
1840|0
264
382
459|5955
3556
3536
3504|3050
2340
2318
2280|0
319
458
546|7254
4322
4301
4268|3710
2840
2818
2780|0
378
540
641|8682
5153
5132
5099|4450
3390
3371
3340| |15|0
2
5
10
15|0
147
229
283
318|4423
2719
2696
2659
2623|2270
1770
1748
1712
1675|0
186
283
346
385|5678
3467
3442
3402
3363|2900
2260
2235
2193
2150|0
239
355
432
479|7099
4304
4278
4234
4192|3620
2800
2777
2739
2700|0
290
426
510
564|8665
5232
5204
5159
5115|4410
3410
3385
3343
3300|0
346
501
599
665|10 393
6251
6222
6175
6129|5300
4080
4057
4019
3980| |20|0
2
5
California Plumbing Code Medium relevance — show source text
c.|12|96|86|118|106|140|128|190|176|244|226| |24″ o.c.|18|118|104|148|132|178|162|244|224|314|292| |24″ o.c.|24|142|124|178|158|216|196|298|274|384|356| |24″ o.c.|28|158|138|198|176|242|218|334|306|432|400| |24″ o.c.|32|172|150|218|194|268|240|370|340|480|444| |24″ o.c.|36|188|164|240|212|292|264|406|372|528|488| |24″ o.c.|42|212|184|270|240|332|298|460|422|600|556| |24″ o.c.|48|236|204|302|268|370|332|516|472|672|622| |||EXPOSURE C|EXPOSURE C|EXPOSURE C|EXPOSURE C|EXPOSURE C|EXPOSURE C|EXPOSURE C|EXPOSURE C|EXPOSURE C|EXPOSURE C| |12″ o.c.|12|95|88|110|102|126|118|161|151|198|186| |12″ o.c.|18|121|111|141|131|163|151|208|195|257|242| |12″ o.c.|24|148|136|173|160|200|185|256|239|317|298| |12″ o.c.|28|166|152|195|179|225|208|289|269|358|335| |12″ o.c.|32|184|168|216|199|249|231|321|299|398|373| |12″ o.c.|36|202|185|237|219|274|254|353|329|438|411| |12″ o.c.|42|229|210|269|248|312|289|402|375|499|468| |12″ o.c.|48|256|234|302|278|349|323|450|420|560|524| |16″ o.c.|12|126|117|146|136|168|157|214|201|263|247| |16″ o.c.|18|161|148|188|174|217|201|277|259|342|322| |16″ o.c.|24|197|181|230|213|266|246|340|318|422|396| |16″ o.c.|28|221|202|259|238|299|277|384|358|476|446| |16″ o.c.|32|245|223|287|265|331|307|427|398|529|496| |16″ o.c.|36|269|246|315|291|364|338|469|438|583|547| |16″ o.c.|42|305|279|358|330|415|384|535|499|664|622| |16″ o.c.|48|340|311|402|370|464|430|599|559|745|697|
California Plumbing Code Medium relevance — show source text

2
5
8|206
197
245
280|777
482
470
458|414
321
311
300|258
246
305
344|1002
617
604
591|536
417
404
392|360
339
418
470|1257
768
754
740|658
513
500
486|521
486
598
665|1852
1120
1104
1089|967
743
730
715| |10|0
2
5
10|202
193
241
296|844
531
518
497|449
354
344
325|253
242
299
363|1093
681
667
643|584
456
443
423|351
332
409
492|1373
849
834
808|718
559
544
520|507
475
584
688|2031
1242
1224
1194|1057
848
825
788| |15|0
2
5
10
15|195
187
231
284
334|966
631
616
592
568|523
413
400
381
367|244
232
287
349
404|1259
812
795
768
742|681
543
526
501
484|336
319
392
470
540|1591
1015
997
966
937|838
673
657
628
601|488
457
562
664
750|2374
1491
1469
1433
1399|1237
983
963
928
894| |20|0
2
5
10
15
20|190
182
224
277
325
374|1053
708
692
666
640
616|573
468
457
437
419
400|238
227
279
339
393
448|1379
914
896
866
838
810|750
611
596
570
549
526|326
309
381
457
526
592|1751
1146
1126
1092
1060
1028|927
754
734
702
677
651|473
443
547
646
730
808|2631
1689
1665
1626
1587
1550|1346
1098
1074
1037
1005
973| |30|0
2
5
California Plumbing Code Medium relevance — show source text
THOUSANDS OF BTU PER HOUR**|APPLIANCE INPUT RATING IN THOUSANDS OF BTU PER HOUR|APPLIANCE INPUT RATING IN THOUSANDS OF BTU PER HOUR| |HEIGHT
_H _
(feet)|LATERAL
L
(feet)|FAN|FAN|NAT|FAN|FAN|NAT|FAN|FAN|NAT|FAN|FAN|NAT| |HEIGHT
_H _
(feet)|LATERAL
L
(feet)|Min|Max|Max|Min|Max|Max|Min|Max|Max|Min|Max|Max| |6|0
2
4
6|211
201
237
263|695
423
416
409|369
284
277
271|267
251
295
327|894
541
533
526|469
368
360
352|371
347
409
449|1118
673
664
656|569
453
443
433|537
498
584
638|1639
979
971
962|849
648
638
627| |8|0
2
5
8|206
197
245
280|777
482
470
458|414
321
311
300|258
246
305
344|1002
617
604
591|536
417
404
392|360
339
418
470|1257
768
754
740|658
513
500
486|521
486
598
665|1852
1120
1104
1089|967
743
730
715| |10|0
2
5
10|202
193
241
296|844
531
518
497|449
354
344
325|253
242
299
363|1093
681
667
643|584
456
443
423|351
332
409
492|1373
849
834
808|718
559
544
520|507
475
584
688|2031
1242
1224
1194|1057
848
825
788| |15|0
2
5
CPC § 1315.2 Medium relevance — show source text
Table 1315.2(14) Corrugated Stainless Steel Tubing (CSST) . . . . . . . . . . . . . . . 310

Table 1315.2(15) Corrugated Stainless Steel Tubing (CSST) . . . . . . . . . . . . . . . 311

Table 1315.2(16) Corrugated Stainless Steel Tubing (CSST) . . . . . . . . . . . . . . . 312

Table 1315.2(17) Corrugated Stainless Steel Tubing (CSST) . . . . . . . . . . . . . . . 313

Table 1315.2(18) Corrugated Stainless Steel Tubing (CSST) . . . . . . . . . . . . . . . 314

Table 1315.2(19) Polyethylene Plastic Pipe . . . . . . . 315

Table 1315.2(20) Polyethylene Plastic Pipe . . . . . . . 216

Table 1315.2(21) Polyethylene Plastic Pipe . . . . . . . 317

Table 1315.2(22) Polyethylene Plastic Tubing . . . . . 318

Table 1315.2(23) Polyethylene Plastic Tubing . . . . . 318

Table 1315.2(24) Schedule 40 Metallic Pipe . . . . . . 319

Table 1315.2(25) Schedule 40 Metallic Pipe . . . . . . 320

Table 1315.2(26) Schedule 40 Metallic Pipe . . . . . . 321

Table 1315.2(27) Schedule 40 Metallic Pipe . . . . . . 322

Table 1315.2(28) Semi-Rigid Copper Tubing . . . . . . 323

Table 1315.2(29) Semi-Rigid Copper Tubing . . . . . . 324

Table 1315.2(30) Semi-Rigid Copper Tubing . . . . . . 330

Table 1315.2(31) Corrugated Stainless Steel Tubing (CSST) . . . . . . . . . . . . . . . 326

Table 1315.2(32) Corrugated Stainless Steel Tubing (CSST) . . . . . . . . . . . . . . . 327

Table 1315.2(33) Corrugated Stainless Steel Tubing (CSST) . . . . . . . . . . . . . . . 328

Table 1315.2(34) Polyethylene Plastic Pipe . . . . . . . 329

Table 1315.2(35) Polyethylene Plastic Pipe . . . . . . . 330

Table 1315.2(36) Polyethylene Plastic Tubing . . . . . 331

CHAPTER 14 PROCESS PIPING. . . . . . . . . . . . 333

1401.0 General. . . . . . . . . . . . . . . . . . . . . 335

1401.1 Applicability. . . . . . . . . . . . . . . . . . 335

1402.0 Permit . . . . . . . . . . . . . . . . . . . . . . 335
CPC § 12-7 Medium relevance — show source text
Title 19, Division 1]|||||||||||||||||||||||| |Chapter / Section|||||||||||||||||||||||| |AASHTO HB-17—2002|||X||||||||||||||||||||| |ASTM D638—2022|||X||||||||||||||||||||| |ASTM D3909/D3909M_—2022_|||X||||||||||||||||||||| |ASTM E84_—2023d_|||X||||||||||||||||||||| |ASTM E119_—2022_|||X||||||||||||||||||||| |ASTM E136_—2024a_|||X||||||||||||||||||||| |ASTM E1354_—2023_|||X||||||||||||||||||||| |ASTM E2632—2020|||X||||||||||||||||||||| |ASTM E2652—2022|||X||||||||||||||||||||| |ASTM E2707—2022|||X||||||||||||||||||||| |ASTM E2726/E2726M—
2012a(2017)|||X||||||||||||||||||||| |ASTM E2957—2017|||X||||||||||||||||||||| |ASTM G155—2021|||X||||||||||||||||||||| |NFPA 252—2022|||X||||||||||||||||||||| |NFPA 257—2022|||X||||||||||||||||||||| |SFM 12-7A-1|||X||||||||||||||||||||| |SFM 12-7A-2|||X||||||||||||||||||||| |SFM 12-7A-3|||X||||||||||||||||||||| |SFM 12-7A-4|||X||||||||||||||||||||| |SFM 12-7A-4A|||X||||||||||||||||||||| |UL 9—2009|||X||||||||||||||||||||| |UL 10B—2008|||X||||||||||||||||||||| |UL 10C—2016|||X||||||||||||||||||||| |UL 94—2023|||X||||||||||||||||||||| |UL 263_—2011|||X||||||||||||||||||||| |UL 723—2018|||X||||||||||||||||||||| |UL 790—2022_|||X|||||||||||||||||||||
- The California Code of Regulations (CCR), Title 19, Division 1 provisions that are found in the California Wildland-Urban Interface Code are a reprint from the current CCR, Title 19, Division 1 text for the code user’s convenience only. The scope, applicability and appeals procedures of CCR, Title 19, Division I remain the same. The state agency does not adopt sections identified by the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.
CPC § 309.0 Medium relevance — show source text
2025 CALIFORNIA PLUMBING CODE 469

), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

IS 33

Uniform Plumbing Code References for Ductile Iron and PVC Pressure Building Supply and Exterior Cold-Water Piping

The following sections of the 2024 Uniform Plumbing Code apply to ductile iron and PVC pressure building supply and exterior cold-water piping.

Chapter 3 General Regulations

309.0 Workmanship

312.0 Protection of Piping, Materials, and Struc tures

313.0 Hangers, Supports, and Anchors

314.0 Trenching, Excavation, and Backfill

Chapter 6 Water Supply and Distribution

604.0 Materials (water piping)

Table 604.1 Materials for Building Supply and Water Distribution Piping and Fittings

605.4 Ductile Iron Pipe and Joints

605.12 PVC Plastic Pipe and Joints

605.16.2 Plastic Pipe to Other Materials

609.0 Installation, Testing, Unions, and Location

Abbreviations

IAPMO International Association of Plumbing and Mechanical Officials

UPC Uniform Plumbing Code published by IAPMO

AWWA American Water Works Association

CSA Canadian Standards Association

Applicable Standards.

ASME B16.4 Gray Iron Threaded Fittings Classes 125 and 250

ASTM D1785 Poly (Vinyl Chloride) (PVC) Plastic Pipe, Schedules 40, 80, and 120

ASTM D2241 Poly (Vinyl Chloride) (PVC) Pressure-Rated Pipe (SDR Series)

ASTM D2466 Poly (Vinyl Chloride) (PVC) Plastic Pipe Fittings, Schedule 40

ASTM D2467 Poly (Vinyl Chloride) (PVC) Plastic Pipe Fittings, Schedule 80

ASTM F1970 Special Engineered Fittings, Appurtenances or Valves for use in Poly (Vinyl Chloride) (PVC) or Chlorinated Poly (Vinyl Chloride) (CPVC) Systems

AWWA C110 Ductile Iron and Gray-Iron Fittings

AWWA C111 Rubber-Gasket Joints for Ductile-Iron Pressure Pipe and Fittings

AWWA C151 Ductile-Iron Pipe, Centrifugally Cast

AWWA C153 Ductile-Iron Compact Fitting

AWWA C900 Polyvinyl Chloride (PVC) Pressure Pipe and Fabricated Fittings, 4 in. through 12 in. (100 mm through 300 mm)

AWWA C904 Crosslinked Polyethylene (PEX) Pressure Tubing, ½ in. through 3 In. (13 mm through 76 mm), for Water Service

AWWA C907 Injection-Molded Polyvinyl Chloride (PVC) Pressure Fittings, 4 In, through 12 in (100 mm through 300 mm) for Water, Wastewater and Reclaimed Water Service

IAPMO/

ANSI UPC-1 Uniform Plumbing Code

470 2025 CALIFORNIA PLUMBING CODE

), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

ROOF RISE* (inches)	MAXIMUM WATER DEPTH AT DRAIN (inches)
Flat	3
2	4
4	5
6	6

ROOF RISE* (inches)	ABOVE ROOF LEVEL AT DRAIN (inches)
Flat	3
2	4
4	5
6	6

CPC § 37-2020 Medium relevance — show source text

336 2025 CALIFORNIA PLUMBING CODE

REFERENCED STANDARDS

TABLE 1701.1 (continued) REFERENCED STANDARDS

STANDARD NUMBER	STANDARD TITLE	APPLICATION	REFERENCED SECTION
ASME B16.3-2021	Malleable Iron Threaded Fittings: Classes 150 and 300	Fittings	Table 604.1, Table 701.2
ASME B16.4-2021	Gray Iron Threaded Fittings: Classes 125 and 250	Fittings	Table 604.1
ASME B16.5-2020	Pipe Flanges and Flanged Fittings: NPS1⁄2 through NPS 24 Metric/Inch	Fittings	1208.5.11.2(1)
ASME B16.12-2019	Cast Iron Threaded Drainage Fittings	Fittings	Table 701.2
ASME B16.15-2018	Cast Copper Alloy Threaded Fittings: Classes 125 and 250	Fittings	Table 604.1
ASME B16.18-2018	Cast Copper Alloy Solder Joint Pressure Fittings	Fittings	Table 604.1
ASME B16.20-2017	Metallic Gaskets for Pipe Flanges	Joints	1208.5.12.2
ASME B16.21-2021	Nonmetallic Flat Gaskets for Pipe Flanges	Joints	1208.5.12.3
ASME B16.22-2018	Wrought Copper and Copper Alloy Solder-Joint Pressure Fit- tings	Fittings	Table 604.1, 1321.1
ASME B16.23-2016	Cast Copper Alloy Solder Joint Drainage Fittings: DWV	Fittings	Table 701.2
ASME B16.24-2016	Cast Copper Alloy Pipe Flanges, Flanged Fittings, and Valves: Classes 150, 300, 600, 900, 1500, and 2500	Fittings	1208.5.11.3
ASME B16.

CPC § 1505.12. Medium relevance — show source text
Where horizontal piping materials do not comply with this requirement, the minimum separation shall be increased to 60 inches (1524 mm). The potable water piping shall be installed at an elevation above the treated nonpotable water piping.

Exception: [DWR] Recycled water supply systems that are within or a part of a building shall comply with Section 1505.12.

1502.5 Abandonment. Alternate water source systems that are no longer in use or fail to be maintained in accordance with Section 1501.5 shall be abandoned. Abandonment shall comply with Section 1502.5.1 and Section 1502.5.2.

1502.5.1 General. An abandoned system or part thereof covered under the scope of this chapter shall be disconnected from remaining systems, drained, plugged, and capped in an approved manner.

2025 CALIFORNIA PLUMBING CODE 311

), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

ALTERNATE WATER SOURCES FOR NONPOTABLE APPLICATIONS

1502.5.2 Underground Tank. An underground water storage tank that has been abandoned or otherwise discontinued from use in a system covered under the scope of this chapter shall be completely drained and filled with earth, sand, gravel, concrete, or other approved material or removed in a manner satisfactory to the Authority Having Jurisdiction. 1502.6 Sizing. Unless otherwise provided for in this chapter, alternate water source piping shall be sized in accordance with Chapter 6 for sizing potable water piping.

1503.0 Gray Water Systems. [BSC-CG] Gray water sys- tems shall be verified in accordance with the California Green Building Standards Code (CALGreen), Chapter 5, Division 5.3. 1503.1 General. The provisions of this section shall apply to the construction, alteration, and repair of gray water systems. A city, county, or city and county or other local government may adopt, after a public hearing and enactment of an ordinance or resolution, building standards that are more restrictive than the gray water building standards adopted in this code. For addi- tional information, see Health and Safety Code Section 18941.7.

(A) All gray water systems shall be designed with a diverter valve to allow the user to direct the flow to the building sewer and either the irrigation field or disposal field, whichever is used. The means of changing the direction flow of the gray water shall be clearly labeled and readily accessible to the user.

(B) Water used to wash diapers or similarly soiled or infec- tious garments or other prohibited contents shall be diverted by the user to the building sewer.

(C) Gray water shall not be used in spray irrigation, allowed to pond or runoff and shall not be discharged directly into or reach any storm sewer system or any surface body of water.

(D) Human contact with gray water or the soil irrigated by gray water shall be minimized and avoided, except as required to maintain the gray water system. The dis- charge point of any gray water subsoil irrigation or sub- surface irrigation field shall be covered by at least two (2) inches (51 mm) of mulch, rock, or soil, or a solid shield to minimize the possibility of human contact.
CPC § 1502.4 Medium relevance — show source text
Inspection and Testing . . . . . . . . .310

1502.4 Separation Requirements . . . . . . .311

1502.5 Abandonment . . . . . . . . . . . . . . . .311

1502.6 Sizing . . . . . . . . . . . . . . . . . . . . . .312

1503.0 Gray Water Systems . . . . . . . . . .312

1503.1 General . . . . . . . . . . . . . . . . . . . . .312

1503.2 System Requirements . . . . . . . . .313

1503.3 Connections to Potable and

Reclaimed (Recycled) Water Systems . . . . . . . . . . . . . . . . . . . . .313

1503.4 Location . . . . . . . . . . . . . . . . . . . .313

1503.5 Plot Plan Submission . . . . . . . . . .313

1503.6 Prohibited Location . . . . . . . . . . . .313

Table 1503.4 Location of Gray Water System . . .314

1503.7 Drawings and Specifications . . . .314

1503.8 Procedure for Estimating Gray Water Discharge . . . . . . . . .314

1503.9 Gray Water System Components . . . . . . . . . . . . . . . . .315

1504.0 Subsurface Irrigation System Zones . . . . . . . . . . . . . . . .316

1504.1 General . . . . . . . . . . . . . . . . . . . . .316

1504.2 Required Area of Subsurface Irrigation Fields, Subsoil Irrigation Fields, and Mulch Basins . . . . . . . . . . . . . . . .316

1504.3 Determination of Maximum

Absorption Capacity . . . . . . . . . . .316

Table 1504.2 Design of Six Typical Soils . . . . . .316

1504.4 Groundwater Level . . . . . . . . . . . .316

1504.5 Irrigation, Disposal Field and Mulch Basin Construction . . . . . .316

Table 1504.5.3 Subsoil Irrigation Field Construction . . . . . . . . . . . . . . . . .318

Table 1504.5.5 Subsurface Irrigation Design Criteria for Six Typical Soils . . . . .318

1504.6 Reserved . . . . . . . . . . . . . . . . . . .318

1504.7 Reserved . . . . . . . . . . . . . . . . . . .318

1504.8 Gray Water System Color and Marking Information . . . . . . . .318

1504.9 Other Collection and

Distribution Systems . . . . . . . . . . .318

1504.10 Testing . . . . . . . . . . . . . . . . . . . . .318

1504.11 Maintenance . . . . . . . . . . . . . . . . .318

1505.0 Recycled Water Supply Systems in Buildings . . . . . . . . . .318
CPC § 1501.0 Medium relevance — show source text
1501.0 General . . . . . . . . . . . . . . . . . . . . .309

1501.1 Applicability . . . . . . . . . . . . . . . . . .309

1501.2 System Design . . . . . . . . . . . . . . .309

1501.3 Permit . . . . . . . . . . . . . . . . . . . . . .309

1501.4 Component Identification . . . . . . .309

1501.5 Maintenance and Inspection . . . .309

1501.6 Operation and Maintenance Manual . . . . . . . . . . . . . . . . . . . . .309

1501.7 Minimum Water Quality Requirements . . . . . . . . . . . . . . . .309

Table 1501.5 Recommended Minimum Alternate Water Source Testing, Inspection, and Maintenance Frequency . . . . . . . . . . . . . . . . . . .310

1501.8 Material Compatibility . . . . . . . . . .310

1501.9 Signage . . . . . . . . . . . . . . . . . . . .310

1501.10 System Controls . . . . . . . . . . . . . .310

1502.0 Inspection and Testing . . . . . . . . .310

1502.1 General . . . . . . . . . . . . . . . . . . . . .310

1502.2 Supply System Inspection and Test . . . . . . . . . . . . . . . . . . . .310

1502.3 Cross-Connection

Inspection and Testing . . . . . . . . .310

1502.4 Separation Requirements . . . . . . .311

1502.5 Abandonment . . . . . . . . . . . . . . . .311

1502.6 Sizing . . . . . . . . . . . . . . . . . . . . . .312

1503.0 Gray Water Systems . . . . . . . . . .312

1503.1 General . . . . . . . . . . . . . . . . . . . . .312

1503.2 System Requirements . . . . . . . . .313

1503.3 Connections to Potable and

Reclaimed (Recycled) Water Systems . . . . . . . . . . . . . . . . . . . . .313

1503.4 Location . . . . . . . . . . . . . . . . . . . .313

1503.5 Plot Plan Submission . . . . . . . . . .313

1503.6 Prohibited Location . . . . . . . . . . . .313

Table 1503.4 Location of Gray Water System . . .314

1503.7 Drawings and Specifications . . . .314

1503.8 Procedure for Estimating Gray Water Discharge . . . . . . . . .314

1503.9 Gray Water System Components . . . . . . . . . . . . . . . . .315

1504.0 Subsurface Irrigation System Zones . . . . . . . . . . . . . . . .316

1504.1 General . . . . . . . . . . . . . . . . . . . . .316
CPC § 1305.2.3.3 Medium relevance — show source text
2, 1305.2.3.3, 1305.2.4.1, 1305.2.5, 1305.2.5.1, 1305.2.6, 1305.2.7.1, 1305.2.8, 1305.2.9, 1305.2.9.1, 1305.2.10, 1305.2.10.1, 1305.2.11, 1305.2.11.1, 1305.2.12.1, 1305.2.13, Table 1305.2.15, 1305.2.15.1, 1305.2.16.1, 1305.2.17, 1305.2.17.1, 1305.2.18, 1305.2.18.1, 1305.2.19, Table 1305.2.19, 1305.2.20, 1305.2.20.1, 1307.1.1, 1401.2, 1402.1, 1402.2, 1402.2.1, 1402.3, 1402.4, 1402.5, 1402.6, 1501.5, 1504.1.1, 1504.1.4.1, 1504.1.7, 1509.1, 1509.3, 1510.1

CEC — 25 : California Energy Code

302.2, 702.7, 708.1, 809.1, 907.1, 1104.1

CFC—25: California Fire Code

101.2.2, 101.4.2, 301.3.1, 302.2, 307.1, 308.1, 802.2.1, 802.2.3, 803.2.3, 803.4.1.1, 803.4.1.2, 803.4.1.3, 803.4.1.4, 803.4.1.5, 803.4.1.6, Table 804.5.1.1(1), 904.1.5, 1011.6.1.1, 1303.1.2, 1305.2.8.1, 1305.2.14, 1305.2.14.1, 1401.2, 1501.1, 1501.5, 1502.1, 1502.1.1, 1502.2, 1502.3, 1504.1, 1507.1, 1507.2

CMC—25: California Mechanical Code

302.2, 702.7, 807.1, 902.1.1, 1008.1, 1305.2.7.1, 1305.2.8, 1305.2.8.1

CPC—25: California Plumbing Code

302.2, 408.1, 702.7, 1009.1, 1009.2, 1009.3, 1009.5, 1302.1.6, 1503.1
California Plumbing Code Medium relevance — show source text

18
38
50
59
69|349
250
242
229
217
206|202
166
160
150
142
134|0
20
47
62
73
84|540
377
367
351
337
322|307
249
241
228
217
206|0
33
62
81
94
107|776
531
519
499
481
464|430
346
337
321
308
295| |30|0
2
5
10
15
20
30|0
9
21
27
33
56
NA|100
81
77
70
64
58
NA|64
56
54
50
NA
NA
NA|0
13
28
37
44
53
73|213
166
160
150
141
132
113|128
112
108
102
96
90
NA|0
14
36
48
57
66
88|374
283
275
262
249
237
214|220
185
176
171
163
154
NA|0
18
45
59
70
80
104|587
432
421
405
389
374
346|336
280
273
261
249
237
219|0
27
58
77
90
102
131|853
613
600
580
560
542
507|475
394
385
371
357
343
321| |50|0
2
5
10
15
20
30|0
8
20
26
59
NA
NA|101
86
82
76
70
NA
NA|67
61
NA
NA
NA
NA
NA|0
11
27
35
42
50
69|216
183
177
168
158
149
131|134
122
119
114
NA
NA
NA|0
14
35
45
54
63
84|397
320
312
299
287
275
250|232
206
200
190
180
169
NA|0
15
43
56
66
76
99|633
497
487
471
455
440
410|363
314
308
298
288
278
259|0
California Plumbing Code Medium relevance — show source text

32
50
59|375
232
227
223|205
157
153
149|0
44
66
78|524
321
316
310|285
217
211
205| |8|0
2
5
8|0
12
23
28|84
57
53
49|50
40
38
35|0
16
32
39|165
109
103
98|94
75
71
66|0
25
42
51|276
178
171
164|155
120
115
109|0
28
53
64|415
263
255
247|235
180
173
165|0
42
70
84|583
365
356
347|320
247
237
227| |10|0
2
5
10|0
12
23
30|88
61
57
51|53
42
40
36|0
17
32
41|175
118
113
104|100
81
77
70|0
23
41
54|295
194
187
176|166
129
124
115|0
26
52
67|447
289
280
267|255
195
188
175|0
40
68
88|631
402
392
376|345
273
263
245| |15|0
2
5
10
15|0
11
22
29
35|94
69
65
59
53|58
48
45
41
37|0
15
30
40
48|191
136
130
121
112|112
93
87
82
76|0
20
39
51
61|327
226
219
206
195|187
150
142
135
128|0
22
49
64
76|502
339
330
315
301|285
225
217
208
198|0
38
64
84
98|716
475
463
445
429|390
316
300
288
275| |20|0
2
5
10
15
20|0
10
21
28
34
48|97
75
71
64
58
52|61
51
48
44
40
35|0
CPC § 304.8 Medium relevance — show source text
|76
71
67
63|88
82
77
73|150
141
133
126|178
167
157
149|306
285
268
254|355
331
311
295|593
555
524
498|686
644
609
579|1170
1090
1030
974|1360
1280
1200
1140|2420
2260
2140
2030|2720
2540
2400
2280| |150
200
250
300|19
17
15
13|27
23
21
19|52
45
40
37|60
52
46
42|104
91
82
75|122
106
95
87|206
178
159
144|240
207
184
168|409
355
319
234|477
415
373
342|793
686
613
559|936
812
728
665|1660
1440
1290
1180|1860
1610
1440
1320|

For SI units: 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m [3] /h, 1 pound-force per square inch = 6.8947 kPa, 1 inch water column = 0.249 kPa
CPC § 1323.13.3 Medium relevance — show source text
2, 1323.13.3| |1326.4 - 1326.10|1326.5 - 1326.11| |1505.6 - 1505.14|1505.5 - 1505.13| |Figure 1505.10|Figure 1505.9| |1506.6 - 1506.13|1506.5 - 1506.12| |1603.3 - 1603.4|1603.4 - 1603.5| |Table 1603.4|Table 1603.5| |1603.5 - 1603.19|1603.6 - 1603.20| |1603.20|1503.2.4| |L 402.9 - L 402.11|L 402.8 - L 402.10| |L 404.9 - L 404.12|L 404.8 - L 404.11| |L 411.5, L 411.6|L 411.2, L411.3| |L 411.7|L 411.4| |L 411.9 - L 411.12|L 411.5 - L 411.8|

xxii 2025 CALIFORNIA PLUMBING CODE

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RELATED PUBLICATIONS AND SERVICES

The Documents Listed are Not by this Reference Adopted by The State of California.

IAPMO provides a variety of other products which are useful for inspectors, building officials, architects, engineers,

manufacturers, contractors, plumbers, and apprentices.

IAPMO Headquarters Directory

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Publication Order Desk Phone: 800-85-IAPMO

Publication Toll Free Fax: 877-85-CODES

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Uniform Plumbing Code – 2024 Edition:

The Uniform Plumbing Code is the most widely adopted plumbing code in the world. The 2024 edition contains complete “turnkey” requirements for the installation and maintenance of plumbing systems, all in one easy to use book.

Uniform Plumbing Code Illustrated Training Manual:

The UPC Illustrated Training Manual is an excellent reference for anyone involved in the plumbing industry. It contains an extensive definitions section and several hundred comprehensive technical diagrams and illustrations. It serves as a textbook, and it also is useful as a valuable tool for explaining the intent and use of the Code.

Uniform Plumbing Code Study Guide:

This book is the perfect complement to the UPC Illustrated Training Manual. Alone, it constitutes a complete self-study course for learning the UPC. It has hundreds of questions, general practice exams, and plumbing math, pipe sizing exercises and fitting identification. A big help in getting you ready for a certification exam!

Guide to Important Code Questions to the Uniform Plumbing Code:

An excellent reference for learning and understanding plumbing code changes and identifies code changes between editions. It is a useful tool for preparing code change proposals.

Uniform Mechanical Code – 2024 Edition:

The Uniform Mechanical Code contains complete requirements for the installation and maintenance of heating, ventilating, cooking and refrigeration systems.

Uniform Mechanical Code Illustrated Training Manual:

Contains technical diagrams and illustrations that demonstrate the intent and use of the UMC. A great reference for everyone involved in Mechanical HVACR design and installation.

Uniform Mechanical Code Study Guide:
California Plumbing Code Medium relevance — show source text
|100 psf|1 hr
23 min|||7|1, 2|11/3| |F/C-4-RC-9|4″|4″ deep (4370 psi);1/4″ reinforcement bars
at 6″ pitch with3/4″ cover;1/4″ main rein-
forcement bars at 4″ pitch perpendicular
with1/2″ cover; 13′1″ span restrained.|150 psf|2 hrs|||7|1, 3|2| |F/C-4-RC-10|4″|4″ thick (5140 psi) deck;1/4″ reinforce-
ment bars at 71/2″ pitch with7/8″ cover;3/8″
main reinforcement bars at 33/4″ pitch
perpendicular with1/2″ cover; 13′1″ span
restrained.|140 psf|1 hr
16 min|||7|1, 5|11/4| |F/C-4-RC-11|4″|4″ thick (4000 psi) concrete deck;
3″ × 11/2″ × 4 lbs R.S.J.; 2′6″ C.R.S.; flush
with top surface; 4″ × 6″ x 13 SWG mesh
reinforcement 1″ from bottom of slab; 6′6″
span restrained.|150 psf|2 hrs|||7|1, 3|2| |F/C-4-RC-12|4″|4″ deep (2380 psi) concrete deck;
3″ × 11/2″ × 4 lbs R.S.J.; 2′6″ C.R.S.; flush
with top surface; 4″ × 6″ x 13 SWG mesh
reinforcement 1″ from bottom surface;
6′6″ span restrained.|150 psf|1 hr
3 min|||7|1, 2|1| |F/C-4-RC-13|41/2″|41/2″ thick (5200 psi) deck;1/4″ reinforce-
ment bars at 71/4″ pitch with7/8″ cover;3/8″
main reinforcement bars at 33/4″ pitch
perpendicular with1/2″ cover; 13′1″ span
restrained.|140 psf|2 hrs|||7|1, 3|2| |F/C-4-RC-14|41/2″|41/2″ deep (2525 psi) concrete deck;1/4″
reinforcement bars at 71/2″ pitch with7/8″
cover;3/8″ main reinforcement bars at
33/8″ pitch perpendicular with1/2″ cover;
13′1″ span restrained.|150 psf|42 min|||7|1, 5|2/3| |F/C-4-RC-15|41/2″|41/2″ deep (4830 psi) concrete deck;
11/2″ × No.

CPC § 1601.2 Medium relevance — show source text

2025 CALIFORNIA PLUMBING CODE 323

324 2025 CALIFORNIA PLUMBING CODE

CALIFORNIA PLUMBING CODE – MATRIX ADOPTION TABLE

CHAPTER 16 - NONPOTABLE RAINWATER CATCHMENT SYSTEMS

(Matrix Adoption Tables are non-regulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)

Adopting Agency Adopt Entire Chapter Adopt Entire Chapter as amended (amended sections listed below) Adopt only those sections that are listed below Chapter/Section 1601.2 1601.3 & Exceptions 1 & 2 1601.5 1601.6 1601.7 1602.4 & Exceptions 1602.7 1603.3 1603.3.1 & Exception 1603.4 1603.4.1 Table 1603.4 1603.7 1603.8 1603.9 1603.10 A & B 1603.12 1603.20 1604.1 - 1604.3 1605.3 1605.3.2 1605.3.3	BSC	BSC- CG	SFM	HCD	Col6	Col7	DSA	Col9	Col10	OSHPD	Col12	Col13	Col14	Col15	Col16	Col17	BSCC	DPH	AGR	DWR	CEC	CA	SL	SLC
Adopting Agency Adopt Entire Chapter Adopt Entire Chapter as amended (amended sections listed below) Adopt only those sections that are listed below Chapter/Section 1601.2 1601.3 & Exceptions 1 & 2 1601.5 1601.6 1601.7 1602.4_& Exceptions_ 1602.7 1603.3 1603.3.1 &Exception 1603.4 1603.4.1 Table 1603.4 1603.7 1603.8 1603.9 1603.10_A & B_ 1603.12 1603.20 1604.1 - 1604.3 1605.3 1605.3.2 1605.3.

CPC § 1505.1 Medium relevance — show source text
1505.1 General . . . . . . . . . . . . . . . . . . . . .318

1505.2 Permit . . . . . . . . . . . . . . . . . . . . . .319

1505.3 System Changes . . . . . . . . . . . . .319

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TABLE OF CONTENTS

1505.4 Connections to Potable or Recycled Water Supply Systems . . . . . . . . . . . . . . . . . . . .319

1505.5 Water Pressure . . . . . . . . . . . . . . .319

1505.6 Initial Cross-Connection Test . . . .319

1505.7 Recycled Water Supply System Materials . . . . . . . . . . . . .319

1505.8 Recycled Water Supply System Color and Marking Information . . . . . . . . . . . . . . . . . .319

1505.9 Valves . . . . . . . . . . . . . . . . . . . . . .319

1505.10 Hose Bibbs . . . . . . . . . . . . . . . . . .320

1505.11 Required Appurtenances . . . . . . .320

1505.12 Pipe Separation in Trenches . . . .320

1505.13 Signage . . . . . . . . . . . . . . . . . . . .320

1505.14 Inspection and Testing . . . . . . . . .320

1505.15 Minimum Water Quality Requirements for Reclaimed (Recycled) Water . . . . . . . . . . . . .322

1505.16 Maintenance and Inspection . . . .322

Table 1505.16 Minimum Reclaimed (Recycled) Water Source Testing, Inspection, and Maintenance Frequency . . . . . . .322

1506.0 On-Site Treated Nonpotable Gray Water Systems . . . . . . . . . .322

1506.1 General . . . . . . . . . . . . . . . . . . . . .322

1506.2 Plumbing Plan Submission . . . . . .322

1506.3 System Changes . . . . . . . . . . . . .322

1506.4 Connections to Potable or Recycled Water Supply Systems . . . . . . . . . . . . . . . . . . . .322

1506.5 Water Pressure . . . . . . . . . . . . . . .322

1506.6 Initial Cross-Connection Test . . . .323

1506.7 On-Site Treated Nonpotable Gray Water System Materials . . .323

1506.8 On-Site Treated Nonpotable Gray Water Devices and Systems . . . . . . . . . . . . . . . . . . . .323

1506.9 On-Site Treated Nonpotable Gray Water System Color and Marking Information . . . . . . . . . . .323
CPC § 1506.11 Medium relevance — show source text
1506.11 Valves . . . . . . . . . . . . . . . . . . . . . .323

1506.12 Signs . . . . . . . . . . . . . . . . . . . . . . .323

1506.13 Inspection and Testing . . . . . . . . .323

CHAPTER 16 NONPOTABLE RAINWATER

CATCHMENT SYSTEMS . . . . . . .325

1601.0 General . . . . . . . . . . . . . . . . . . . . .327

1601.1 Applicability . . . . . . . . . . . . . . . . . .327

1601.2 System Design . . . . . . . . . . . . . . .327

1601.3 Permit . . . . . . . . . . . . . . . . . . . . . .327

1601.4 Component Identification . . . . . . .327

1601.5 Maintenance and Inspection . . . .327

Table 1601.5 Minimum Alternate Water Source Testing, Inspection, and Maintenance Frequency . . . .327

1601.6 Operation and Maintenance Manual . . . . . . . . . . . . . . . . . . . . .328

1601.7 Minimum Water Quality Requirements . . . . . . . . . . . . . . . .328

1601.8 Material Compatibility . . . . . . . . . .328

1601.9 System Controls . . . . . . . . . . . . . .328

1601.10 Separation Requirements . . . . . . .328

1601.11 Abandonment . . . . . . . . . . . . . . . .328

1601.12 Sizing . . . . . . . . . . . . . . . . . . . . . .328

1602.0 Nonpotable Rainwater Catchment Systems . . . . . . . . . . .328

1602.1 General . . . . . . . . . . . . . . . . . . . . .328

1602.2 Plumbing Plan Submission . . . . . .328

1602.3 System Changes . . . . . . . . . . . . .328

1602.4 Connections to Potable or Reclaimed (Recycled) Water Systems . . . . . . . . . . . . . . .328

1602.5 Initial Cross-Connection Test . . . .328

1602.6 Sizing . . . . . . . . . . . . . . . . . . . . . .328

1602.7 Rainwater Catchment System Materials . . . . . . . . . . . . . . . . . . . .329

1602.8 Rainwater Catchment System Color and Marking Information . . .329

1602.9 Deactivation and Drainage for Cross-Connection Test . . . . . . . . .329

1603.0 Design and Installation . . . . . . . . .329

1603.1 Rainwater Catchment Systems . . .329

1603.2 Outside Hose Bibbs . . . . . . . . . . .329

1603.3 Rainwater Catchment

Collection Surfaces . . . . . . . . . . . .329

1603.4 Minimum Water Quality . . . . . . . .329
CPC § 3.3.187 Medium relevance — show source text
44 2025 CALIFORNIA PLUMBING CODE

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DEFINITIONS

Water Main (Street Main). A water supply pipe for public or community use.

Water Station. A designated location intended to provide access to drinking water through a device or appliance.

Water Supply System. The building supply pipe, the water distribution pipes, and the necessary connecting pipes, fittings, control valves, backflow prevention devices, and all appurtenances carrying or supplying potable water in or adjacent to the building or premises.

Water/Wastewater Utility. A public or private entity which may treat, deliver or do both functions to reclaimed (recycled) water, potable water, or both to wholesale or retail cus tomers.

Welder, Pipe. A person who specializes in the welding of pipes and holds a valid certificate of competency from a recognized testing laboratory, based on the requirements of the ASME Boiler and Pressure Vessels code, Section IX.

Wet Procedure Locations. The area in a patient care space where a procedure is performed that is normally subject to wet conditions while patients are present, including standing fluids on the floor or drenching of the work area, either of which condition is intimate to the patient or staff. [NFPA 99:3.3.187]

Wet Vent. A vent that also serves as a drain.

Whirlpool Bathtub. A bathtub fixture equipped and fitted with a circulating piping system designed to accept, circulate, and discharge bathtub water upon each use.

226.0 – X –

No definitions.

227.0 – Y –

Yoke Vent. A pipe connecting upward from soil or waste stack to a vent stack to prevent pressure changes in the stacks.

228.0 – Z –

No definitions.

2025 CALIFORNIA PLUMBING CODE 45

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46 2025 CALIFORNIA PLUMBING CODE

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CALIFORNIA PLUMBING CODE – MATRIX ADOPTION TABLE

CHAPTER 3 - GENERAL REGULATIONS

(Matrix Adoption Tables are non-regulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)

|Adopting Agency
Adopt Entire Chapter
Adopt Entire Chapter as
amended (amended
sections listed below)
Adopt only those sections
that are listed below
Chapter/Section
301.3
301.3.1
301.3.1.1
301.3.1.2
301.4.1
301.7
301.8
303.1 Exception
304.1 Exception
310.11
310.12
310.13
310.14
310.15
311.1 Note
312.2
312.7
312.11
313.8
321.0
322.0
323.
CPC § 31-2022 Medium relevance — show source text
2025 CALIFORNIA PLUMBING CODE 453

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454 2025 CALIFORNIA PLUMBING CODE

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"The information contained in this appendix is not part of this American National Standard (ANS) and has not been processed in accordance with ANSI's requirements for an ANS. As such, this appendix may contain material that has not been subjected to public review or a consensus process. In addition, it does not contain requirements necessary for conformance to the standard."

The following IAPMO Installation Standard is included here for the convenience of the users of the Uniform Plumbing Code. It is not considered as a part of the Uniform Plumbing Code unless formally adopted as such. This Installation Standard is an independent, stand-alone document published by the International Association of Plumbing and Mechanical Officials and is printed herein by the expressed written permission of IAPMO.

INSTALLATION STANDARD FOR PEX TUBING SYSTEMS

FOR HOT- AND COLD-WATER DISTRIBUTION

IAPMO IS 31-2022

The provisions contained in this appendix are not mandatory unless specifically adopted by a state agency, or referenced in the adopting ordinance.

1 Scope

1.1 General

1.1.1 This Standard specifies requirements for the installation of SDR 9 CTS crosslinked polyethylene (PEX) tubing and fittings, including cold-expansion, crimp, press, and mechanical compression fittings, intended for hot- and cold-water distribution systems within buildings.

1.1.2 This Standards applies to

(a) SDR 9 CTS PEX tubing complying with ASTM F876 and pressure-rated in accordance with PPI TR-3; and (b) PEX fitting systems complying with (i) ASTM F877, for mechanical compression fittings and metal or plastic insert fittings with stainless steel press sleeves; (ii) ASTM F1807 or ASTM F2159, for metal or plastic insert fittings with copper crimp rings; (iii) ASTM F1960, for cold expansion fittings with PEX reinforced rings; or (iv) ASTM F2080, for cold expansion fittings with metal compression sleeves. 1.2 Terminology

In this Standard,

(a) “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy to comply with the Standard; (b) “should” is used to express a recommendation, but not a requirement; (c) “may” is used to express an option or something permissible within the scope of the Standard; and (d) “can” is used to express a possibility or a capability. Notes accompanying sections of the Standard do not specify requirements or alternative requirements; their purpose is to separate explanatory or informa

tive material from the text. Notes to tables and figures are considered part of the table or figure and can be written as requirements.

1.3 Units of Measurement

SI units are the primary units of record in global commerce. In this Standard, the inch/pound units are shown in parentheses. The values stated in each measurement system are equivalent in application, but each unit system is to be used independently. All references to gallons are to U.S. gallons.

2 Reference Publications
CPC § 25.4 Medium relevance — show source text
2
5
10
15
20
30|176
168
204
253
299
345
442|1292
971
953
923
894
866
809|704
613
602
583
562
543
502|220
209
257
313
363
415
521|1724
1273
1252
1217
1183
1150
1086|948
811
795
765
736
708
649|295
280
347
418
481
544
674|2223
1615
1591
1551
1512
1473
1399|1189
1007
991
963
934
906
848|428
401
496
589
668
741
892|3432
2426
2396
2347
2299
2251
2159|1818
1509
1490
1455
1421
1387
1318| |100|0
2
5
10
15
20
30
50|166
158
194
238
281
325
418
617|1404
1152
1134
1104
1075
1046
988
866|765
698
688
672
656
639
NA
NA|207
196
240
293
342
391
491
711|1900
1532
1511
1477
1443
1410
1343
1205|1033
933
921
902
884
864
824
NA|273
259
322
389
447
507
631
895|2479
1970
1945
1905
1865
1825
1747
1591|1300
1168
1153
1133
1110
1087
1041
NA|395
371
460
547
618
690
834
1138|3912
3021
2990
2938
2888
2838
2739
2547|2042
1817
1796
1763
1730
1696
1627
1489|

For SI units: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 square inch = 0.000645 m [2]
- NA: Not applicable.
114 2025 CALIFORNIA PLUMBING CODE

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WATER HEATERS

TABLE 510.1.2(3) MASONRY CHIMNEY [NFPA 54: TABLE 13.1(c)]*
CPC § 653-5791 Medium relevance — show source text
water.ca.gov DWRwebcomment@water.ca.gov

(916) 653-5791 Plumbing for Recycled Water,

Floodplain Construction

Division of the State Architect

dgs.ca.gov/dsa

(916) 445-8100

Access Compliance [DSA-AC]

(916) 445-5827 DSAaccess@dgs.ca.gov

Access for Persons with Disabilities

Structural Safety [DSA-SS, DSA-SS/CC]

Public Schools & Community Colleges,

State Essential Services Buildings

State Historical Building Safety Board [SHBSB]

(916) 445-7627 shbsb@dgs.ca.gov

Historical Building Rehabilitation,

Preservation, Restoration or Relocation

iv 2025 CALIFORNIA PLUMBING CODE

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California Code of Regulations Title 24 California State Agency Contact List (continued)

Energy Commission [CEC]

energy.ca.gov Title24@energy.ca.gov

(800) 772-3300 Building Energy Efficiency,

Compliance Manual & Compliance Forms

Office of the State Fire Marshal [SFM]

osfm.fire.ca.gov codedevelopment@fire.ca.gov

(916) 568-3800 Fire & Life Safety

State Lands Commission [SLC]

slc.ca.gov MOTEMS.Public@slc.ca.gov

(510) 741-4950 Marine Oil Terminals

State Librarian [SL]

library.ca.gov csllaw@library.ca.gov

(916) 323-9843 Public Library

Construction & Renovation

2025 CALIFORNIA PLUMBING CODE v

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How to Distinguish Between Model Code Language and California Amendments

To distinguish between model code language and the incorporated California amendments, including exclusive California standards, California amendments will appear in italic font print.

[BSC] This is an example of a state agency acronym used to identify an adoption or amendment by the agency. The acronyms will appear at California Amendments and in the Matrix Adoption Tables. Sections 1.2.0 through 1.14.0 in Chapter 1, Division 1 of this code, explain the used acronyms, the application of state agency adoptions to building occupancies or building features, the enforcement agency as designated by state law (may be the state adopting agency or local building or fire official), the authority in state law for the state agency to make the adoption, and the specific state law being implemented by the agency’s adoption. The following acronyms are used in Title 24 to identify the state adopting agency making an adoption.

Legend of Acronyms of Adopting State Agencies _BSC California Building Standards Commission (see Section 1.
California Plumbing Code Medium relevance — show source text

26
52
67|447
289
280
267|255
195
188
175|0
40
68
88|631
402
392
376|345
273
263
245| |15|0
2
5
10
15|0
11
22
29
35|94
69
65
59
53|58
48
45
41
37|0
15
30
40
48|191
136
130
121
112|112
93
87
82
76|0
20
39
51
61|327
226
219
206
195|187
150
142
135
128|0
22
49
64
76|502
339
330
315
301|285
225
217
208
198|0
38
64
84
98|716
475
463
445
429|390
316
300
288
275| |20|0
2
5
10
15
20|0
10
21
28
34
48|97
75
71
64
58
52|61
51
48
44
40
35|0
14
29
38
46
55|202
149
143
133
124
116|119
100
96
89
84
78|0
18
38
50
59
69|349
250
242
229
217
206|202
166
160
150
142
134|0
20
47
62
73
84|540
377
367
351
337
322|307
249
241
228
217
206|0
33
62
81
94
107|776
531
519
499
481
464|430
346
337
321
308
295| |30|0
2
5
10
15
20
30|0
9
21
27
33
56
NA|100
81
77
70
64
58
NA|64
56
54
50
NA
NA
NA|0
13
28
37
44
53
73|213
166
160
150
141
132
113|128
112
108
102
96
90
NA|0
14
36
48
57
66
88|374
283
275
262
249
237
214|220
185
176
171
163
154
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Frequently asked questions

Do I have to separate storm and sanitary systems inside the building?

Yes. The CPC requires separate storm and sanitary drainage systems inside buildings; storm water must not be discharged into sewers intended for sanitary drainage (see §1101.2 and §1101.3).

What size sump pump is required for subsoil drains?

When a sump is required, the CPC states the pump capacity shall be not less than 15 gpm (0.95 L/s) and the sump a minimum 15 in diameter by 18 in deep; discharge piping not less than 1 1/2 in diameter. (§1101.6.2).

Are scuppers required on parapet walls?

Yes — scuppers shall be provided in parapet walls when needed for secondary drainage; scuppers must be at least 4 in high and sized per the roof drain requirement (see §1101.12.2.1).

Can I size my storm system using local rainfall tables?

Yes. The CPC permits sizing by flow rate (gpm/ft²) using the rainfall rates in Appendix D or by using the roof area tables in Table 1103.1 / 1103.2; the Appendix includes worked examples.

I asked about §311.1, §321.0, §322.0 and §323.0 — why didn't you quote those?

The CPC matrix in the uploaded files lists those sections under Chapter 3, but the actual text for those specific section numbers was not included in the uploaded file set I searched, so I could not quote or ground requirements to those §’s directly. I used the CPC storm drainage text that is present in the files (Chapter 11, §1101.x et seq.) to produce a practical, grounded summary.

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