CPC · California Plumbing Code

Code compliance agency: roles and responsibilities

Q: Who is the "Authority Having Jurisdiction" (AHJ)?

The AHJ is the legally appointed enforcement agency (or agency official) charged with enforcing the California Plumbing Code in a given jurisdiction; it has authority to interpret the code, adopt supplemental rules, appoint deputies/inspectors, and request other officials’ assistance ( § 103.0 ) .

Q: How do I know if a state agency (not my city) enforces the code for my building?

Check the BSC scope and application categories in § 1.2.1 and the matrix adoption tables — they list state buildings, universities, and other categories where a state or specified agency is the enforcing body rather than local government ( § 1.2.1 ) .

Q: Can the AHJ waive a mandatory plumbing requirement if it’s impractical?

No — the AHJ may interpret and clarify code application and may adopt supplemental rules consistent with the code’s intent, but cannot waive mandatory requirements explicitly provided in the code ( § 103.0 ) .

Q: Are code inspectors personally liable for enforcement actions?

When acting in good faith and without malice , officials enforcing the code are protected from personal liability for damages arising from acts or omissions in performing their duties under § 103.0 .

Q: The AHJ asked for a technical report — is that allowed?

Yes. The AHJ has authority to require technical opinions, reports, and descriptive details to determine compliance; such submittals are commonly required for engineered or alternate systems (see § 103.0 and Appendix C guidance) .

In short: the California Plumbing Code gives the Authority Having Jurisdiction (AHJ) legal authority to enforce and interpret plumbing rules, appoint deputies and inspectors, adopt clarifying regulations, and require technical submittals; **§ 103.0** sets those powers and liability protections, while **§ 1.2.1** explains when state agencies (not local ones) enforce the code for state buildings and other special applications .

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Last reviewed: July 6, 2026

What the code requires — 2-4 sentences

The California Plumbing Code assigns enforcement authority to an Authority Having Jurisdiction (AHJ) and establishes the local code enforcement agency and its official. The AHJ has the power to enforce, interpret, adopt supplemental rules, appoint deputies and inspectors, and request assistance from other officials as needed, and is protected from personal liability when acting in good faith (§ 103.0) . The code also defines the scope of the state-level enforcement authority and special applications (the Building Standards Commission (BSC) and state-enforcing agencies) under § 1.2.1 .

The single most important rule: the Authority Having Jurisdiction is the legally appointed enforcement agency with authority to interpret and enforce the Plumbing Code, appoint deputies/inspectors, and adopt clarifying rules — and acts under statutory protections when doing so (see § 103.0 and § 1.2.1) .

Requirements in detail

Core roles (plain list)

Creation of enforcement agency / code official — the jurisdiction creates the code agency and the official in charge (the code official); that agency implements, administers, and enforces the code (see § 1.2.1 context for state agencies and § 103.0 for AHJ powers) .
Appointment and deputies — the AHJ may appoint deputies, technical officers, inspectors and staff and may deputize inspectors as needed to carry out enforcement (§ 103.0) .
Interpretation and rulemaking — the AHJ may render interpretations of code provisions and adopt rules/regulations to clarify application provided those interpretations and rules comply with the code’s intent (§ 103.0) .
Powers of a law enforcement officer — the AHJ is vested with powers comparable to a law enforcement officer for code enforcement purposes (§ 103.0) .
Liability protection — officials enforcing the code, acting in good faith and without malice, are protected from personal liability for damages resulting from acts or omissions in enforcement (§ 103.0) .
Scope & special applications (BSC/state) — § 1.2.1 defines application categories (for example, state buildings, universities, existing state-owned buildings) and identifies which enforcing agency (state or local) applies in those circumstances .

Decision table — who decides what and where to look

Decision / dimension	Typical values / who decides	Why it matters	Code Reference
Who is the enforcement agency for a project	Local city/county code compliance agency or specified state agency for state buildings	Determines permit processes, inspections, applicable amendments	§ 1.2.1
Who appoints the code official	Chief appointing authority of the jurisdiction	Legal appointment, authority to act and appoint deputies	§ 103.0 (appointment language)
Can the AHJ make interpretations or adopt rules?	Yes — must comply with intent and purpose of the code	Clarifies ambiguous technical requirements; cannot waive mandatory code provisions	§ 103.0
Can the AHJ deputize inspectors?	Yes — may appoint/deputize technical officers and inspectors	Allows delegation to qualified personnel for carrying out inspections	§ 103.0
Is the AHJ personally liable for enforcement acts?	No, when acting in good faith and without malice	Protects individual inspectors/officers while enforcing code	§ 103.0

What the AHJ may require (examples drawn from CPC context)

Submittal of technical data and descriptive details for engineered or alternate systems (AHJ can require filings to determine compliance) — see the CPC appendices and the AHJ provisions tied to engineered systems; the AHJ may require documentation and inspections prior to final approval (see C 101.3 / C 301.1 in the CPC appendices for engineered systems) .
Cooperation from other jurisdictional officials when needed to discharge duties (§ 103.0) .

Exceptions & special cases

State vs. local enforcement: For state buildings and other statutorily defined categories, the enforcement agency may be a state or local agency specified by law rather than the usual local AHJ — see § 1.2.1 for the BSC matrix and special applications (state buildings, UC/CSU, existing state-owned buildings, etc.) .
Supplemental rules: The AHJ may adopt supplemental rules to clarify application so long as those rules remain consistent with the code’s intent; such rules cannot waive explicit code requirements (§ 103.0) .
Deputization: The AHJ may deputize inspectors; however, scope of authority and delegation follows the appointing/jurisdictional procedures in the local government (the CPC permits appointment consistent with jurisdictional procedures) (§ 103.0) .
Not-adopted sections / agency adoption differences: Some portions of the model UPC or appendices are not adopted by the state or are adopted only by certain state agencies — the matrix adoption notes and Division I explain adoption limits; check the front-matter and matrix adoption tables when the project is in a state-controlled building or subject to a special state agency .

If you need a determination about which agency enforces a particular project (local vs. a state agency), that fact is governed by the applications listed in § 1.2.1 and the matrix adoption tables — consult those entries for the specific building type and state agency applicability .

Common mistakes

Assuming the AHJ can waive code-mandated requirements. The AHJ can interpret and clarify but cannot waive requirements explicitly provided in the code (§ 103.0) .
Misidentifying the enforcement agency for state buildings — many state-owned or university buildings follow the state-specific enforcement path listed in § 1.2.1, not default local enforcement .
Failing to provide required submittals or technical reports when requested — the AHJ is authorized to require technical opinions, plans, or testing to determine compliance (other sections in Chapter 1 and appendices elaborate on submittals) .
Delegation confusion — permitting staff or third parties to perform plan checks or inspections may be allowed, but must conform to the jurisdiction’s procedures and any state law limits; check permit and plan-review provisions in the CPC and state housing law references for limits and requirements .

Worked example — applying § 103.0 (concrete scenario with numbers)

Scenario: A county AHJ receives plans for a 3-story medical office building. The owner submits an engineered alternate drainage system and requests phased inspections.

Steps the AHJ can take under the CPC:

Require submittal of descriptive details and technical data for the engineered system (per the AHJ’s authority to require filings and interpret the code) — submitter provides 6 sets of drawings plus a technical report prepared by a registered design professional. The AHJ sets a plan-check fee equal to actual review cost (local fee program) — plan review authority is tied to enforcement agency procedures and fees (see permit/fee provisions referenced in CPC) .
Appoint or deputize two additional inspectors (plumbing and mechanical) to perform staged inspections, consistent with the appointing authority’s procedures and staffing authorization under § 103.0 .
Require the designer to perform periodic inspections and to certify the installation prior to final approval — designer provides certification and an as-built set showing changes; AHJ compares installations to documentation and may perform destructive inspection of representative penetrations if needed (the AHJ has authority to determine inspection scope) .
If an issue arises where the owner claims a listed product cannot be used, the AHJ may require an approved listing or a technical opinion (the AHJ may require a technical report prepared by a qualified engineer) to verify compliance — the AHJ cannot waive the applicable mandatory requirement, only consider alternatives that substantiate equivalent performance (§ 103.0) .
If the AHJ acts in good faith and without malice in imposing a stop work order or directive, the individual officials are protected from personal liability under § 103.0 (liability section) .

Numerical example for staffing decision: AHJ determines inspection load will require 2 additional half-time inspectors for a 12-month project estimated to have 240 inspection visits (20 visits/month). AHJ can authorize (deputize) staff consistent with local budget/appointment rules under § 103.0; costs recovered through local fees subject to local enabling authority (see permit/fee rules referenced in CPC) .

Related provisions

(These are commonly used together with § 103.0 and § 1.2.1; consult the code text for detail.)

§ 104.1 / § 104.2 — Duties and powers of the code official, determination of compliance and authority to adopt policies (see duties/powers referenced in the same chapter) .
§ 1.8.4 — Permits, fees, applications and inspections (fee limits and permit requirements referenced in Division I) .
C 101.3 / C 301.1 (Appendix C) — AHJ’s right to require descriptive details for engineered plumbing systems and inspection/installation verification requirements .
Section(s) describing matrix adoption and items not adopted by state agencies (front-matter and matrix adoption tables in Division I) — relevant when determining whether a local or state agency enforces particular code chapters or sections (§ 1.2.1 context) .
Sections on inspection scope and required inspections (examples: Sections on required inspection of firestop penetrations and applicable AHJ inspection duties) — AHJ determines inspection type, quantity, and methods (§ 103.0 related duties) .

If you want, I can extract the exact CPC language for the listed related provisions and assemble a one-page checklist for AHJs, applicants, and plan reviewers.

Code references

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

CPC § 407.1 Medium relevance — show source text

SECTION 407—MECHANICAL

407.1 General. Existing mechanical systems undergoing repair shall not make the building less complying than it was before the damaged occurred. [HCD 1, HCD 2 & BSC] Existing mechanical systems undergoing repair shall comply with the California Mechanical Code.

SECTION 408—PLUMBING

408.1 Materials. Plumbing materials and supplies shall not be used for repairs that are prohibited in the California Plumbing Code .

[HCD 1, HCD 2, BSC & BSC-CG] Existing plumbing systems undergoing repair shall comply with the California Plumbing Code and Divi- sion 4.3 or Division 5.3 of the CALGreen Code, as applicable.

408.2 Water closet replacement. The maximum water consumption flow rates and quantities for all replaced water closets shall be 1.28 gallons (4.8 L ) per flushing cycle.

408.3 Health care facilities. Portions of medical gas systems being repaired in Group I-2, ambulatory care facilities and outpatient clinics shall comply with NFPA 99 requirements for repairs.

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CALIFORNIA EXISTING BUILDING CODE – MATRIX ADOPTION TABLE

CHAPTER 4A – REPAIRS [OSHPD 1]

(Matrix Adoption Tables are nonregulatory, 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
Adopt Entire Chapter as amended (amended sections listed below)
Adopt only those sections that are listed below
Chapter / Section

The 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.

2025 CALIFORNIA EXISTING BUILDING CODE 4A-1

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CPC § 11.0 Medium relevance — show source text
11.0 - 1.11.11_|||X|||||||||||||||||||||| |1.13.0||||||||||||||||||||X||||| |Division II - Scope and
Administration||||||||||||||||||||||||| |101.0||||||||||X|X|X||X|X|||||||||| |102.0||||||||||X|X|X||X|X|||||||||| |103.0||||||||||X|X|X||X|X|||||||||| |104.2 Items 1 & 2||||X|X|||||||||||||||||||| |104.3.1||||||||||X|X|X||X|X|||||||||| |104.4.3.1|X|||||||||||||||||||||||| |105.0||||||||||X|X|X||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 1

ADMINISTRATION

DIVISION I

CALIFORNIA ADMINISTRATION

1.1.0 General.

1.1.1 Title. These regulations shall be known as the Califor- nia Plumbing Code, may be cited as such and will be referred to herein as “this code.” The California Plumbing Code is Part 5 of thirteen parts of the official compilation and publi- cation of the adoption, amendment, and repeal of plumbing regulations to the California Code of Regulations, Title 24, also referred to as the California Building Standards Code. This part incorporates by adoption the 2024 Uniform Plumb- ing Code of the International Association of Plumbing and Mechanical Officials with necessary California amendments.

1.1.2 Purpose. The purpose of this code is to establish the minimum requirements to safeguard the public health, safety and general welfare through structural strength, means of egress facilities, stability, access to persons with disabilities, sanitation, adequate lighting and ventilation, and energy con- servation; safety to life and property from fire and other haz- ards attributed to the built environment; and to provide safety to fire fighters and emergency responders during emergency operations.

1.1.3 Scope. The provisions of this code shall apply to the construction, alteration, movement, enlargement, replace- ment, repair, equipment, use and occupancy, location, main- tenance, removal, and demolition of every building or structure or any appurtenances connected or attached to such buildings or structures throughout the State of California.
CPC § 1.11.0. Medium 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.

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CHAPTER 4

PLUMBING FIXTURES AND FIXTURE FITTINGS

Note: In addition to the requirements of this chapter, buildings or facilities where accessibility is required for applications listed in California Code of Regulations, Title 24, Part 2 (California Building Code), Chapter 1, Section 1.9.1 regulated by the Division of the State Architect–Access Compliance shall also comply with Title 24, Part 2, Chapter 11A or 11B, as applicable under authority cited by CA Government Code Section 4450 and in reference cited by CA Government Code Sections 4450 through 4461, 12955.1(c), and CA Health and Safety Code Sections 18949.1, 19952 through 19959.

401.0 General.

401.1 Applicability. This chapter shall govern the materials and installation of plumbing fixtures, including faucets and fixture fittings, and the minimum number of plumbing fixtures required based on occupancy. 401.2 Quality of Fixtures. Plumbing fixtures shall be constructed of dense, durable, non-absorbent materials and shall have smooth, impervious surfaces, free from unnecessary concealed fouling surfaces. 401.3 Water-Conserving Fixtures and Fittings. Note 1: [BSC-CG & DSA-SS] Flow rates for specified plumbing fixtures for mandatory nonresidential construction are contained in Chapter 5, Division 5.3 of the California Green Building Standards Code (Part 11, Title 24, Califor- nia Code of Regulations - CALGreen). Scoping provisions applicable to nonresidential additions and alterations are contained in Section 301.3 of CALGreen. Note 2: [BSC-CG] On and after January 1, 2014, certain commercial real property, as defined in Civil Code Section 1101.3, shall have its noncompliant plumbing fixtures replaced with appropriate water-conserving plumbing fix- tures under specific circumstances. See Civil Code Section 1101.1 et seq. for definitions, types of commercial real prop- erty affected, effective dates, circumstances necessitating replacement of noncompliant plumbing fixtures, and duties and responsibilities for ensuring compliance.

[HCD-1] All noncompliant plumbing fixtures in any residen- tial real property shall be replaced with water-conserving plumbing fixtures. Plumbing fixture replacement is required prior to issuance of a certificate of final completion, certificate of occupancy, or final permit approval by the local building _department.
CPC § 101.5 Medium relevance — show source text
B 101.5 Trap Sizes. Trap sizes are required to be equivalent to the branches they serve (two pipe sizes larger than normal), and tailpieces between fixtures or floor drains and such traps shall be reduced to normal size.

B 101.6 Layout Drawings. Duplicate layout drawings of each such proposed piping system shall be presented to the Authority Having Jurisdiction and approval obtained before an installation is made. Complicated layouts shall be checked by qualified personnel. B 101.6.1 Example of Sizing. A floor drain normally requires a 2 inch (50 mm) trap and waste. On a combination waste and vent system, both trap and waste shall be increased two pipe sizes (through 2 [1] ⁄ 2 inches and 3 inches) (65 mm and 80 mm), which would make the trap 3 inches (80 mm). Pipe sizes recognized for this purpose are 2 inches, 2 [1] ⁄ 2 inches, 3 inches, 3 [1] ⁄ 2 inches, 4 inches, 4 [1] ⁄ 2 inches, 5 inches, 6 inches, etc. (50 mm, 65 mm, 80 mm, 90 mm, 100 mm, 115 mm, 125 mm, 150 mm, etc.). The tailpiece between the floor drain and its trap shall be 2 inches (50 mm) (or normal size) to ensure that the amount of wastewater entering the trap partially fills the waste branch. A 3 inch (80 mm) floor drain would thus require a 4 inch (100 mm) trap, and a 4 inch (100 mm) floor drain would require a 5 inch (125 mm) trap for the reasons previously stated.

WHERE IN DOUBT, CHECK WITH YOUR LOCAL Authority Having Jurisdiction.

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CALIFORNIA PLUMBING CODE – MATRIX ADOPTION TABLE

APPENDIX C - ALTERNATE PLUMBING 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.)

CPC § 301.5 Medium relevance — show source text

** A domestic water supply connection to a non-sewered sanitation system shall be protected in accordance with this code.

O 301.5 Effluent Storage. Any container or vessel for the storage of effluent discharged from a non-sewered sanitation system and not integral to such system shall be installed in accordance with the plumbing code. O 301.6 Systems Employing Combustion. A non-sewered sanitation system employing combustion shall comply with the mechanical code.

O 301.7 Connection to Plumbing System Not Required. Unless the Authority Having Jurisdiction determines otherwise, a non-sewered sanitation system is not required to be connected to the drainage system of the building or premises.

O 401.0 Manual Required. O 401.1 Operation and Maintenance Manual. Nonsewered sanitation systems shall have an operation and maintenance manual provided by the manufacturer.

O 501.0 System Output. O 501.1 General. The use or disposal of all substances exiting the non-sewered sanitation system shall be determined by the Authority Having Jurisdiction.

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CALIFORNIA PLUMBING CODE – MATRIX ADOPTION TABLE

APPENDIX P - PROFESSIONAL QUALIFICATIONS

(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
Adopt Entire Chapter as amended (amended sections listed below)
Adopt only those sections that are listed below
Chapter/Section

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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CPC § 401.2 Medium relevance — show source text
401.2 Quality of Fixtures. Plumbing fixtures shall be constructed of dense, durable, non-absorbent materials and shall have smooth, impervious surfaces, free from unnecessary concealed fouling surfaces. 401.3 Water-Conserving Fixtures and Fittings. Note 1: [BSC-CG & DSA-SS] Flow rates for specified plumbing fixtures for mandatory nonresidential construction are contained in Chapter 5, Division 5.3 of the California Green Building Standards Code (Part 11, Title 24, Califor- nia Code of Regulations - CALGreen). Scoping provisions applicable to nonresidential additions and alterations are contained in Section 301.3 of CALGreen. Note 2: [BSC-CG] On and after January 1, 2014, certain commercial real property, as defined in Civil Code Section 1101.3, shall have its noncompliant plumbing fixtures replaced with appropriate water-conserving plumbing fix- tures under specific circumstances. See Civil Code Section 1101.1 et seq. for definitions, types of commercial real prop- erty affected, effective dates, circumstances necessitating replacement of noncompliant plumbing fixtures, and duties and responsibilities for ensuring compliance.

[HCD-1] All noncompliant plumbing fixtures in any residen- tial real property shall be replaced with water-conserving plumbing fixtures. Plumbing fixture replacement is required prior to issuance of a certificate of final completion, certificate of occupancy, or final permit approval by the local building department. See Civil Code Section 1101.1, et seq., for the def- inition of a noncompliant plumbing fixture, types of residential buildings affected and other important enactment dates. Note 3: [OSHPD 1, 2, 3 & 4] Also refer to Title 20, Cali- fornia Code of Regulations, Division 2, Chapter 4, Article 4, Section 1605.3 (i). Note 4: Appliance Efficiency Regulations – Water Effi- ciency. [CEC] Where California law in Title 20 Sections 1601 et seq. applying to water-using appliances sold or offered for sale within the state specifies a lower maximum flow rate than specified in Section 407.2, 408.3, or 411.2, the lower maximum flow rate shall be required.

402.0 Installation.

402.1 Cleaning. Plumbing fixtures shall be installed in a manner to afford easy access for repairs and cleaning. Pipes from fixtures shall be run to the nearest wall.

402.2 Joints. Where a fixture comes in contact with the wall or floor, the joint between the fixture and the wall or floor shall be made watertight.

402.3 Securing Fixtures. Floor-outlet or floor-mounted fixtures shall be rigidly secured to the drainage connection and to the floor, where so designed, by screws or bolts of copper, copper alloy, or other equally corrosion-resistant material.

CPC § 1.11.0. Medium relevance — show source text

Pipe sizes recognized for this purpose are 2 inches, 2 [1] ⁄ 2 inches, 3 inches, 3 [1] ⁄ 2 inches, 4 inches, 4 [1] ⁄ 2 inches, 5 inches, 6 inches, etc. (50 mm, 65 mm, 80 mm, 90 mm, 100 mm, 115 mm, 125 mm, 150 mm, etc.). The tailpiece between the floor drain and its trap shall be 2 inches (50 mm) (or normal size) to ensure that the amount of wastewater entering the trap partially fills the waste branch. A 3 inch (80 mm) floor drain would thus require a 4 inch (100 mm) trap, and a 4 inch (100 mm) floor drain would require a 5 inch (125 mm) trap for the reasons previously stated.

WHERE IN DOUBT, CHECK WITH YOUR LOCAL Authority Having Jurisdiction.

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CALIFORNIA PLUMBING CODE – MATRIX ADOPTION TABLE

APPENDIX C - ALTERNATE PLUMBING 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	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
Adopt Entire Chapter as amended (amended sections listed below)
Adopt only those sections that are listed below
Chapter/Section

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CPC § 103 Medium relevance — show source text

FLOW GPM	FIXTURE UNITS	Col3
FLOW GPM	FLUSH VALVE TANKS	FLUSHOMETER VALVES
1	0	—
2	1	—
3	3	—
4	4	—
5	6	—
6	7	—
7	8	—
8	10	—
9	12	—
10	13	—
11	15	—
12	16	—
13	18	—
14	20	—
15	21	—
16	23	—
17	24	—
18	26	—
19	28	—
20	30	—
21	32	—
22	34	5
23	36	6
24	39	7
25	42	8
26	44	9
27	46	10
28	49	11
29	51	12
30	54	13
31	56	14
32	58	15
33	60	16
34	63	18
35	66	20
36	69	21
37	74	23
38	78	25
39	83	26
40	86	28
41	90	30
42	95	31

FLOW GPM	FIXTURE UNITS	Col3
FLOW GPM	FLUSH VALVE TANKS	FLUSHOMETER VALVES
43	99	33
44	103	35
45	107	37
46	111	39
47	115	42
48	119	44
49	123	46
50	127	48
51	130	50
52	135	52
53	141	54
54	146	57
55	151	60
56	155	63
57	160	66
58	165	69
59	170	73
60	175	76
62	185	82
64	195	88
66	205	95
68	215	102
70	225	108
72	236	116
74	245	124
76	254	132
78	264	140
80	275	148
82	284	158
84	294	168
86	305	176
88	315	186
90	325	195
92	337	205
94	348	214
96	359	223
98	370	234
100	380	245
105	406	270
110	431	295
115	455	329
120	479	365

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USEFUL TABLES

AREAS AND CIRCUMFERENCES OF CIRCLES

CPC § 104.1 Medium relevance — show source text

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APPENDIX D

Col1	TABLE D 104.1 DISCHARGE FROM RECTANGULAR SCUPPERS (gallons per minute)1, 2, 3, 4	Col3	Col4	Col5	Col6	Col7
WATER HEAD (inches)	WIDTH OF SCUPPER (inches)	WIDTH OF SCUPPER (inches)	WIDTH OF SCUPPER (inches)	WIDTH OF SCUPPER (inches)	WIDTH OF SCUPPER (inches)	WIDTH OF SCUPPER (inches)
WATER HEAD (inches)	6	12	18	24	30	36
1⁄2	6	13	19	25	32	38
1	17	35	53	71	89	107
11⁄2	31	64	97	130	163	196
2	–	98	149	200	251	302
21⁄2	–	136	207	278	349	420
3	–	177	271	364	458	551
31⁄2	–	–	339	457	575	693
4	–	–	412	556	700	844

For SI units: 1 inch = 25.4 mm, 1 gallon per minute = 0.06 L/s

Notes: 1 Table D 104.1 is based on discharge over a rectangular weir with end contractions. 2 The head is the depth of water above the bottom of the scupper opening. 3 The height of the scupper opening shall be not less than two times the design head. 4 Coordinate the allowable head of water with the structural design of the roof.

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CALIFORNIA PLUMBING CODE – MATRIX ADOPTION TABLE

APPENDIX E - MANUFACTURED/MOBILE HOME PARKS AND RECREATIONAL VEHICLE PARKS

(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 § 3.0 Medium relevance — show source text

0|100|–|100|100 x 1 x3⁄4 = 75|–| |Service Sinks|27|3.0|81|–|27|27 x 3 x3⁄4 = 61|–| |Total|–|–|1365|252|–|154|55|

For SI units: 1 gallon per minute = 0.06 L/s, 1 pound-force per square foot = 6.8947 kPa

Allowing for 15 psi (103 kPa) at the highest fixture under the maximum demand of 252 gallons per minute (15.90 L/s), the pressure available for friction loss is found by the following:

55 – [15 + (45 x 0.43)] = 20.65 psi (142.38 kPa)

The allowable friction loss per 100 feet (30 480 mm) of the pipe is, therefore:

100 x 20.65 ÷ 200 = 10.32 psi (71.15 kPa)

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CALIFORNIA PLUMBING CODE – MATRIX ADOPTION TABLE

APPENDIX B - EXPLANATORY NOTES ON COMBINATION WASTE AND VENT 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	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	X	X	X	X	X	X
Adopt Entire Chapter as amended (amended sections listed below)
Adopt only those sections that are listed below
Chapter/Section

CPC § 25.4 Medium relevance — show source text

For SI units: 1 inch = 25.4 mm, 1 gallon per minute = 0.06 L/s

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CALIFORNIA PLUMBING CODE – MATRIX ADOPTION TABLE

APPENDIX E - MANUFACTURED/MOBILE HOME PARKS AND RECREATIONAL VEHICLE PARKS

(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
Adopt Entire Chapter as amended (amended sections listed below)
Adopt only those sections that are listed below
Chapter/Section

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APPENDIX E

MANUFACTURED/MOBILE HOME PARKS AND RECREATIONAL VEHICLE PARKS

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

CPC § 4.1 Medium relevance — show source text
- 100°F
  (16°C-38°C)|1 h|6 h|2 h|12 h|6 h|24 h| |40°F-60°F
  (4°C-16°C)|2 h|12 h|4 h|24 h|12 h|48 h| |10°F- 40°F
  (-12°C+4°C)|8 h|48 h|16 h|96 h|48 h|8 days| |*If gaps or loose fits are encountered in the system, double these cure times.|*If gaps or loose fits are encountered in the system, double these cure times.|*If gaps or loose fits are encountered in the system, double these cure times.|*If gaps or loose fits are encountered in the system, double these cure times.|*If gaps or loose fits are encountered in the system, double these cure times.|*If gaps or loose fits are encountered in the system, double these cure times.|*If gaps or loose fits are encountered in the system, double these cure times.|
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IS 33

FIGURE 1

LOCATION OF THRUST BLOCKS (STANDARD AND METRIC COMBINED) A COMPARISON OF THRUST-BLOCK AREAS (See Section 4.1)

468 2025 CALIFORNIA PLUMBING CODE

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IS 33

FIGURE 2

THRUST BLOCK BEARING AREA (See Section 5.2.2)

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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)
CPC § 102.4 High relevance — show source text
[A] 102.4 Referenced codes and standards. The codes and standards referenced in this code shall be considered part of the requirements of this code to the prescribed extent of each such reference and as further regulated in Sections 102.4.1 and 102.4.2.

Exception: Where enforcement of a code provision would violate the conditions of the listing of the equipment or appliance, the conditions of the listing shall govern.

[A] 102.4.1 Conflicts. Where conflicts occur between provisions of this code and referenced codes and standards, the provisions of this code shall apply.

[A] 102.4.2 Conflicting provisions. Where the extent of the reference to a referenced code or standard includes subject matter that is within the scope of this code, the provisions of this code, as applicable, shall take precedence over the provisions in the referenced code or standard.

[A] 102.5 Partial invalidity. In the event that any part or provision of this code is held to be illegal or void, this shall not have the effect of making void or illegal any of the other parts or provisions.

PART 2—ADMINISTRATION AND ENFORCEMENT

SECTION 103—CODE COMPLIANCE AGENCY

[A] 103.1 Creation of agency. The [ INSERT NAME OF DEPARTMENT ] is hereby created, and the official in charge thereof shall be known as the code official. The function of the agency shall be the implementation, administration and enforcement of the provisions of this code.

[A] 103.2 Appointment. The code official shall be appointed by the chief appointing authority of the jurisdiction.

[A] 103.3 Deputies. In accordance with the prescribed procedures of this jurisdiction and with the concurrence of the appointing authority, the code official shall have the authority to appoint a deputy code official, other related technical officers, inspectors and other employees. Such employees shall have powers as delegated by the code official.

SECTION 104—DUTIES AND POWERS OF CODE OFFICIAL

[A] 104.1 General. The code official is hereby authorized and directed to enforce the provisions of this code.

[A] 104.2 Determination of compliance. The code official shall have the authority to determine compliance with this code, to render interpretations of this code and to adopt policies and procedures in order to clarify the application of this code’s provisions. Such interpretations, policies, and procedures:
1. Shall be in compliance with the intent and purpose of this code.
2. Shall not have the effect of waiving requirements specifically provided for in this code.
[A] 104.2.1 Listed compliance. Where this code or a referenced standard requires equipment, materials, products or services to be listed and a listing standard is specified, the listing shall be based on the specified standard. Where a listing standard is not specified, the listing shall be based on an approved listing criteria. Listings shall be germane to the provision requiring the listing. Installation shall be in accordance with the listing and the manufacturer’s instructions, and where required to verify compliance, the listing standard and manufacturer’s instructions shall be made available to the code official.

[A] 104.2.2 Technical assistance. To determine compliance with this code, the code official is authorized to require the owner or owner’s authorized agent to provide a technical opinion and report.

[A] 104.2.2.1 Cost. A technical opinion and report shall be provided without charge to the jurisdiction.
CPC § 102.6.2 Medium relevance — show source text
[A] 102.6.2 Buildings previously occupied. The legal occupancy of any building existing on the date of adoption of this code shall be permitted to continue without change, except as otherwise specifically provided in this code, the California Fire Code or California Existing Building Code, or as is deemed necessary by the building official for the general safety and welfare of the occupants and the public.

PART 2—ADMINISTRATION AND ENFORCEMENT

SECTION 103—CODE COMPLIANCE AGENCY

[A] 103.1 Creation of enforcement agency. The [ INSERT NAME OF DEPARTMENT ] is hereby created and the official in charge thereof shall be known as the building official. The function of the agency shall be the implementation, administration and enforcement of the provisions of this code.

[A] 103.2 Appointment. The building official shall be appointed by the chief appointing authority of the jurisdiction.

[A] 103.3 Deputies. In accordance with the prescribed procedures of this jurisdiction and with the concurrence of the appointing authority, the building official shall have the authority to appoint a deputy building official, other related technical officers, inspectors and other employees. Such employees shall have powers as delegated by the building official.

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ADMINISTRATION

SECTION 104—DUTIES AND POWERS OF BUILDING OFFICIAL

[A] 104.1 General. The building official is hereby authorized and directed to enforce the provisions of this code.

[A] 104.2 Determination of compliance. The building official shall have the authority to determine compliance with this code, to render interpretations of this code and to adopt policies and procedures in order to clarify the application of its provisions. Such interpretations, policies and procedures:
1. Shall be in compliance with the intent and purpose of this code.
2. Shall not have the effect of waiving requirements specifically provided for in this code.
[A] 104.2.1 Listed compliance. Where this code or a referenced standard requires equipment, materials, products or services to be listed and a listing standard is specified, the listing shall be based on the specified standard. Where a listing standard is not specified, the listing shall be based on an approved listing criteria. Listings shall be germane to the provision requiring the listing. Installation shall be in accordance with the listing and the manufacturer’s instructions, and where required to verify compliance, the listing standard and manufacturer’s instructions shall be made available to the building official.

[A] 104.2.2 Technical assistance. To determine compliance with this code, the building official is authorized to determine compliance with this code, to require the owner or owner’s authorized agent to provide a technical opinion and report.

[A] 104.2.2.1 Cost. A technical opinion and report shall be provided without charge to the jurisdiction.

[A] 104.2.2.2 Preparer qualifications. The technical opinion and report shall be prepared by a qualified engineer, specialist, laboratory or specialty organization acceptable to the building official. The building official is authorized to require design submittals to be prepared by, and bear the stamp of, a registered design professional.
CPC § 102.5 Medium relevance — show source text
** Openings into a drainage or vent system, excepting those openings to which plumbing fixtures are properly connected or which constitute vent terminals, shall be permanently plugged or capped in an approved manner, using the appropriate materials in accordance with this code.

102.5 Health and Safety. Where compliance with the provisions of this code fails to eliminate or alleviate a nuisance, or other dangerous or insanitary condition that involves health or safety hazards, the owner or the owner’s agent shall install such additional plumbing and drainage facilities or shall make such repairs or alterations as ordered by the Authority Having Jurisdiction. 102.6 Changes in Building Occupancy. Plumbing systems that are a part of a building or structure undergoing a change in use or occupancy, as defined in the building code, shall be in accordance with the requirements of this code that are applicable to the new use or occupancy. 102.7 Moved Structures. Parts of the plumbing system of a building or part thereof that is moved from one foundation to another, or from one location to another, shall be in accordance with the provisions of this code for new installations and completely tested as prescribed elsewhere in this section for new work, except that walls or floors need not be removed during such test where other equivalent means of inspection acceptable to the Authority Having Jurisdiction are provided. 102.8 Appendices. The provisions in the appendices are intended to supplement the requirements of this code and shall not be considered part of this code unless formally adopted as such.

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DIVISION II SCOPE AND ADMINISTRATION

103.0 Duties and Powers of the Authority Having Jurisdiction.

103.1 General. The Authority Having Jurisdiction shall be the Authority duly appointed to enforce this code. For such purposes, the Authority Having Jurisdiction shall have the powers of a law enforcement officer. The Authority Having Jurisdiction shall have the power to render interpretations of this code and to adopt and enforce rules and regulations supplemental to this code as deemed necessary in order to clarify the application of the provisions of this code. Such interpretations, rules, and regulations shall comply with the intent and purpose of this code.

In accordance with the prescribed procedures and with the approval of the appointing authority, the Authority Having Jurisdiction shall be permitted to appoint a such number of technical officers, inspectors, and other employees as shall be authorized from time to time. The Authority Having Jurisdiction shall be permitted to deputize such inspectors or employees as necessary to carry out the functions of the code enforcement agency.

The Authority Having Jurisdiction shall be permitted to request the assistance and cooperation of other officials of this jurisdiction so far as required in the discharge of the duties in accordance with this code or other pertinent law or ordinance.

103.2 Liability. The Authority Having Jurisdiction charged with the enforcement of this code, acting in good faith and without malice in the discharge of the Authority Having Jurisdiction’s duties, shall not thereby be rendered personally liable for damage that accrues to persons or property as a result of an act or by reason of an act or omission in the discharge of duties. A suit brought against the Authority Having Jurisdiction or employee because of such act or omission performed in the enforcement of provisions of this code shall be defended by legal counsel provided by this jurisdiction until final termination of such proceedings.
CPC § 102.7 Medium relevance — show source text
[A] 102.7 Partial invalidity. In the event that any part or provision of this code is held to be illegal or void, this shall not have the effect of making void or illegal any of the other parts or provisions.

[A] 102.8 Existing conditions. The legal occupancy or use of any structure or condition existing on the date of adoption of this code shall be permitted to continue without change, except as is specifically covered in this code or the California Fire Code, California Building Code, California Existing Building Code or the California Residential Code, or as is deemed necessary by the code official for the general safety and welfare of the occupants and the public.

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ADMINISTRATION

PART 2—ADMINISTRATION AND ENFORCEMENT

SECTION 103—CODE COMPLIANCE AGENCY

[A] 103.1 Creation of agency. The [ INSERT NAME OF DEPARTMENT ] is hereby created and the official in charge thereof shall be known as the code official. The function of the agency shall be the implementation, administration and enforcement of the provisions of this code.

[A] 103.2 Appointment. The code official shall be appointed by the chief appointing authority of the jurisdiction.

[A] 103.3 Deputies. In accordance with the prescribed procedures of this jurisdiction and with the concurrence of the appointing authority, the code official shall have the authority to appoint a deputy code official, other related technical officers, inspectors and other employees. Such employees shall have powers as delegated by the code official.

SECTION 104—DUTIES AND POWERS OF THE CODE OFFICIAL

[A] 104.1 Powers and duties of the code official. The code official is hereby authorized to enforce the provisions of this code.

[A] 104.2 Determination of compliance. The code official shall have the authority to determine compliance with this code, to render interpretations of this code and to adopt policies and procedures in order to clarify the application of its provisions. Such interpretations, policies and procedures:
1. Shall be in compliance with the intent and purpose of this code.
2. Shall not have the effect of waiving requirements specifically provided for in this code.
[A] 104.2.1 Technical assistance. To determine compliance with this code, the code official is authorized to require the owner, the owner’s authorized agent or the person in possession or control of the building or premises to provide a technical opinion and report.

[A] 104.2.1.1 Costs. A technical opinion and report shall be provided without charge to the jurisdiction.

[A] 104.2.1.2 Preparer qualifications. The technical opinion and report shall be prepared by a qualified engineer, specialist, laboratory or fire safety specialty organization acceptable to the code official. The code official is authorized to require design submittals to be prepared by, and bear the stamp of, a registered design professional.

[A] 104.2.1.3 Content. The technical opinion and report shall analyze the properties of the design, operation or use of the building or premises, the facilities and appurtenances situated thereon and fuel management to identify and propose necessary recommendations.
CPC § 102.2 Medium relevance — show source text
[A] 102.2 Other laws. The provisions of this code shall not be deemed to nullify any provisions of local, state or federal law.

[A] 102.3 Application of references. References to chapter or section numbers, or to provisions not specifically identified by number, shall be construed to refer to such chapter, section or provision of this code.

[A] 102.4 Referenced codes and standards. The codes and standards referenced in this code shall be those that are listed in Chapter 7 and such codes and standards shall be considered as part of the requirements of this code to the prescribed extent of each such reference and as further regulated in Sections 102.4.1 and 102.4.2.

[A] 102.4.1 Conflicts. Where conflicts occur between provisions of this code and the referenced standards, the provisions of this code shall govern.

[A] 102.4.2 Provisions in referenced codes and standards. Where the extent of the reference to a referenced code or standard includes subject matter that is within the scope of this code, the provisions of this code, as applicable, shall take precedence over the provisions in the referenced standard.

[A] 102.5 Subjects not regulated by this code. Where applicable standards or requirements are not set forth in this code, or are contained within other laws, codes, regulations, ordinances or policies adopted by the jurisdiction, compliance with applicable standards of other nationally recognized safety standards, as approved, shall be deemed as prima facie evidence of compliance with the intent of this code. Nothing herein shall derogate from the authority of the code official to determine compliance with codes or standards for those activities or installations within the code official’s jurisdiction or responsibility.

[A] 102.6 Matters not provided for. Requirements that are essential for the public safety of an existing or proposed activity, building or structure, or for the safety of the occupants thereof, which are not specifically provided for by this code, shall be determined by the code official consistent with the necessity to establish the minimum requirements to safeguard the public health, safety and general welfare.

[A] 102.7 Partial invalidity. In the event that any part or provision of this code is held to be illegal or void, this shall not have the effect of making void or illegal any of the other parts or provisions.

[A] 102.8 Existing conditions. The legal occupancy or use of any structure or condition existing on the date of adoption of this code shall be permitted to continue without change, except as is specifically covered in this code or the California Fire Code, California Building Code, California Existing Building Code or the California Residential Code, or as is deemed necessary by the code official for the general safety and welfare of the occupants and the public.

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ADMINISTRATION

PART 2—ADMINISTRATION AND ENFORCEMENT

SECTION 103—CODE COMPLIANCE AGENCY

[A] 103.1 Creation of agency. The [ INSERT NAME OF DEPARTMENT ] is hereby created and the official in charge thereof shall be known as the code official. The function of the agency shall be the implementation, administration and enforcement of the provisions of this code.

[A] 103.2 Appointment. The code official shall be appointed by the chief appointing authority of the jurisdiction.

CPC § 1.11.0. Medium relevance — show source text

• For persistent results, as determined by the Authority Having Jurisdiction, showing = 30 percent positive sites,
long-term control measures shall be implemented in accordance with the direction of a qualified professional2
and the Authority Having Jurisdiction.
• Retreat and retest. If retest is = 30 percent positive, repeat short-term control measures.
• With receipt of results < 30 percent positive, resume monitoring in accordance with the water management plan.
• For persistent results, as determined by the Authority Having Jurisdiction, showing = 30 percent positive sites,
long-term control measures shall be implemented in accordance with the direction of a qualified professional2
and the Authority Having Jurisdiction.|

Notes: 1 In the event that one or more cases of legionellosis are, or may be, associated with the facility, the sampling interpretation shall be in accordance with the Authority Having Jurisdiction. 2 Control measures shall be included in the water management plan.

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CALIFORNIA PLUMBING CODE – MATRIX ADOPTION TABLE

APPENDIX O - NON-SEWERED SANITATION 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	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
Adopt Entire Chapter as amended (amended sections listed below)
Adopt only those sections that are listed below
Chapter/Section

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CPC § 1406.0 Medium relevance — show source text
1406.0 Required Inspection. 1406.1 General. Prior to being concealed, piping penetrations shall be inspected by the Authority Having Jurisdiction to verify compliance with the fire-resistance rating prescribed in the building code. 1406.2 Examination. The Authority Having Jurisdiction shall conduct a thorough examination of sufficient representative installations, including destructive inspection, to provide verification of satisfactory compliance with this chapter, the appropriate manufacturer’s installation instructions applied by the installer, construction documents, specifications, and applicable manufacturer’s product information. 1406.3 Penetrations. The Authority Having Jurisdiction shall determine the type, size, and quantity of penetrations to be inspected. 1406.4 Field Installations. The Authority Having Jurisdiction shall compare the field installations with the documentation supplied by the installer to determine the following:

(1) The required F ratings (1 hour, 2 hour, 3 hour, or 4 hour) and T ratings (0 hour, 1 hour, 2 hour, 3 hour, or 4 hour) of the penetration firestop systems are at least the same as the hourly rating of the assembly being penetrated.

(2) The penetrating firestop system includes the penetrating item as documented through testing of the systems conducted by an independent testing agency.

(3) The penetrating firestop system is installed as tested.

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CALIFORNIA PLUMBING CODE – MATRIX ADOPTION TABLE

CHAPTER 15 - ALTERNATE WATER SOURCES FOR NONPOTABLE APPLICATIONS

(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
1501.0
1501.1
1501.1.1
1501.2
1501.2 Exceptions
1501.3
1501.3 & Exception
1501.4
1501.5
1501.5 Exception
Table 1501.5
1501.5.1
1501.6
1501.7
1501.8
1501.9
1501.9.1
1501.9.2
1501.10
1502.0
1502.1
1502.1 Exception
1502.3
1502.3.2
1502.3.3
1502.4 Exception
1502.5 - 1502.6
1503.0
1503.1
1503.1.1
1503.1.1 - 1503.1.3
1503.2 - 1503.2.3
1503.2.2 Exception
1503.3 & Exceptions
1503.4 Exception
Table 1503.
CPC § 90.1 Medium relevance — show source text
(2) Preheat of the peak service hot-water draw to 85°F (29°C).

Exceptions:

(1) Facilities that employ condenser heat recovery for space heating with a heat recovery design exceeding 30 percent of the peak water-cooled condenser load at design conditions.

(2) Facilities that provide 60 percent of their service water heating from onsite renewable energy or siterecovered energy or from other sources. [ASHRAE 90.1:6.5.6.2.2] L 503.5 Submittals. The Authority Having Jurisdiction shall require submittal of compliance documentation and supplemental information in accordance with Section 104.3.1 of this code.

L 504.0 Solar Water Heating Systems.

L 504.1 General. The erection, installation, alteration, addition to, use or maintenance of solar water heating systems shall be in accordance with this section and the Uniform Solar Energy and Hydronics Code.

L 504.2 Annual Inspection and Maintenance. Solar energy systems that utilize a heat transfer fluid shall annually be inspected unless inspections are required on a more frequent basis by the solar energy system manufacturer.

L 505.0 Hard Water.

L 505.1 Softening and Treatment. Where water has a hardness equal to or exceeding 10 gr/gal (171 mg/L) measured as total calcium carbonate equivalents, the water supply line to water heating equipment and the circuit of boilers shall be softened or treated to prevent accumulation of limescale and consequent reduction in energy efficiency.

L 506.0 Drain Water Heat Exchangers. L 506.1 General. Drain water heat exchangers shall comply with IAPMO PS 92. The heat exchanger shall be accessible.

L 507.0 Heat Recovery from Steam Boiler Blowdown. L 507.1 General. Where heat recovery can be used beneficially to heat boiler makeup water or for other purposes, boiler blowdown from steam boilers exceeding 15 psi (103 kPa) and 3.4 E+06 Btu/h (996 kW) shall be directed to a heat recovery system that reduces the temperature of the blowdown discharge to below 140°F (60°C) without using tempering water.

L 601.0 Installer Qualifications.

L 601.1 Scope. The provisions of this section address minimum qualifications of installers of plumbing and mechanical systems covered within the scope of this appendix.

L 602.0 Qualifications.

L 602.1 General. Where permits are required, the Authority Having Jurisdiction shall have the authority to require contractors, installers, or service technicians to demonstrate competency. Where determined by the Authority Having Jurisdiction, the contractor, installer, or service technician shall be licensed to perform such work.

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APPENDIX L

TABLE L 503.3.2

PERFORMANCE REQUIREMENTS FOR WATER-HEATING EQUIPMENT MINIMUM EFFICIENCY REQUIREMENTS

[ASHRAE 90.1: TABLE 7.8]
CPC § 1.2.1 Medium relevance — show source text
1.2.1 BSC. Specific scope of application of the agency responsible for enforcement, the enforcement agency, and the specific authority to adopt and enforce such provisions of this code, unless otherwise stated.

1. State Buildings for All Occupancies.

Application – State buildings (all occupancies), includ- ing buildings constructed by the Trustees of the Califor- nia State University (CSU) and the Regents of the University of California (UC) where no state agency has the authority to adopt building standards applicable to such buildings.

Enforcing Agency – State or local agency specified by the applicable provisions of law.

Authority Cited – Health and Safety Code Section 18934.5.

Reference – Health and Safety Code, Division 13, Part 2.5, commencing with Section 18901.

2. University of California, California State Universities, and California Community Colleges.

Application – Standards for lighting for parking lots and primary campus walkways at the University of Califor- nia, California State Universities, and California Com- munity Colleges.

Enforcing Agency – State or local agency specified by the applicable provisions of law.

Authority Cited – Government Code Section 14617.

Reference – Government Code Section 14617.

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DIVISION I CALIFORNIA ADMINISTRATION

3. Existing State-Owned Buildings, including those owned by the University of California and by the Cali- fornia State University – Building seismic retrofit stan- dards including abating falling hazards of structural and nonstructural components and strengthening of building structures. See also Division of the State Architect.

Enforcing Agency – State or local agency specified by the applicable provisions of law.

Authority Cited – Government Code Section 16600.

References – Government Code Sections 16600 through 16604.

4. Unreinforced Masonry Bearing Wall Buildings.

Application – Minimum seismic strengthening standards for buildings specified in the California Existing Build- ing Code, except for buildings subject to building stan- dards adopted pursuant to Part 1.5 (commencing with Section 17910).

Enforcing Agency – State or local agency specified by the applicable provisions of law.

Authority Cited – Health and Safety Code Section 18934.7.

Reference – Health and Safety Code Division 13, Part 2.5 commencing with Sections 18901.

1.2.1.1 State Building. For purposes of this code, a “state building” is a structure for which a state agency or state entity has authority to construct, alter, enlarge, replace, repair or demolish.
CPC § 2-4 Medium relevance — show source text
1. The vertical elements of the lateral force-resisting system have suffered damage such that the lateral load-carrying capacity of any story in any horizontal direction has been reduced by more than 10 percent from its pre-earthquake condition.
[BE] EMERGENCY ESCAPE AND RESCUE OPENING. An operable exterior window, door or other similar device that provides for a means of escape and access for rescue in the event of an emergency.

ENFORCEMENT AGENCY. [BSC, DSA-SS, DSA-SS/CC] The agency or organization charged with responsibility for agency or organization compliance with the requirements of this code, also known as the Authority Having Jurisdiction in ASCE 41.

EQUIPMENT OR FIXTURE. Any plumbing, heating, electrical, ventilating, air conditioning, refrigerating and fire protection equipment; and elevators, dumbwaiters, escalators, boilers, pressure vessels and other mechanical facilities; or installations that are related to building services. Equipment or fixture shall not include manufacturing, production or process equipment, but shall include connections from building service to process equipment.

[A] EXISTING BUILDING. A building erected prior to the date of adoption of the appropriate code, or one for which a legal building permit has been issued.

[A] EXISTING STRUCTURE. A structure erected prior to the date of adoption of the appropriate code, or one for which a legal building permit has been issued.

EXISTING STRUCTURE. [OSHPD 1, 1R, 2, 4 & 5] A structure that has a valid certificate of occupancy issued by the building official.

EXTERIOR ELEVATED ELEMENT. See Government Code Section 17973(b)(2).

[BF] EXTERIOR WALL COVERING. A material or assembly of materials applied on the exterior side of exterior walls for the purpose of providing a weather-resisting barrier, insulation or for aesthetics, including but not limited to, veneers, siding, exterior insulation and finish systems, architectural trim and embellishments, such as cornices, soffits, facias, gutters and leaders.

2-4 2025 CALIFORNIA EXISTING BUILDING CODE

on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

DEFINITIONS

[BF] EXTERIOR WALL ENVELOPE. A system or assembly of exterior wall components, including exterior wall finish materials, that provides protection of the building structural members, including framing and sheathing materials, and conditioned interior space from the detrimental effects of the exterior environment.

[A] FACILITY. All or any portion of buildings, structures, site improvements, elements and pedestrian or vehicular routes located on a site.

[BS] FLOOD HAZARD AREA. The greater of the following two areas:
1. The area within a flood plain subject to a 1-percent or greater chance of flooding in any year.
2. The area designated as a flood hazard area on a community’s flood hazard map, or otherwise legally designated.
GENERAL ACUTE CARE HOSPITAL. [OSHPD 1] See California Building Code Section 1224.3.
CPC § 1405.3 Medium relevance — show source text
1405.3 Firestop Systems. Penetrations shall be protected by an approved penetration firestop system installed as tested in accordance with ASTM E119, ASTM E814, UL 263, or UL 1479 with a positive pressure differential of not less than 0.01 of an inch of water (0.002 kPa). Systems shall have an F rating of not less than 1 hour but not less than the required fire-resistance rating of the assembly being penetrated. Systems protecting floor penetrations shall have a T rating of not less than 1 hour but not less than the required fire-resistance rating of the floor being penetrated. Floor penetrations contained within the cavity of a wall at the location of the floor penetration do not require a T rating. No T rating shall be required for floor penetrations by piping that is not in direct contact with combustible material.

1405.4 Connections. Where piping penetrates a rated assembly, the combustible piping shall not connect to noncombustible piping unless it is capable of being demonstrated

2025 CALIFORNIA PLUMBING CODE 305

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

FIRESTOP PROTECTION

that the transition is in accordance with the requirements of Section 1405.3.

1405.5 Unshielded Couplings. Unshielded couplings shall not be used to connect noncombustible piping unless it is capable of being demonstrated that the fire-resistive integrity of the penetration is maintained.

1405.6 Sleeves. Where sleeves are used, the sleeves shall be securely fastened to the fire-resistance-rated assembly. The (inside) annular space between the sleeve and the penetrating item and the (outside) annular space between the sleeve and the fire-resistance-rated assembly shall be firestopped in accordance with this chapter. 1405.7 Insulation and Coverings. Insulation and coverings on or in the penetrating item shall not be permitted unless the specific insulating or covering material has been tested as part of the penetrating firestop system.

1406.0 Required Inspection. 1406.1 General. Prior to being concealed, piping penetrations shall be inspected by the Authority Having Jurisdiction to verify compliance with the fire-resistance rating prescribed in the building code. 1406.2 Examination. The Authority Having Jurisdiction shall conduct a thorough examination of sufficient representative installations, including destructive inspection, to provide verification of satisfactory compliance with this chapter, the appropriate manufacturer’s installation instructions applied by the installer, construction documents, specifications, and applicable manufacturer’s product information. 1406.3 Penetrations. The Authority Having Jurisdiction shall determine the type, size, and quantity of penetrations to be inspected. 1406.4 Field Installations. The Authority Having Jurisdiction shall compare the field installations with the documentation supplied by the installer to determine the following:

(1) The required F ratings (1 hour, 2 hour, 3 hour, or 4 hour) and T ratings (0 hour, 1 hour, 2 hour, 3 hour, or 4 hour) of the penetration firestop systems are at least the same as the hourly rating of the assembly being penetrated.

(2) The penetrating firestop system includes the penetrating item as documented through testing of the systems conducted by an independent testing agency.

(3) The penetrating firestop system is installed as tested.

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CPC § 104.2 Medium relevance — show source text
K 104.2 Prohibited Discharges. Overflows, condensate, and bleed-off pipes from roof-mounted equipment and appliances shall not discharge onto roof surfaces that are intended to collect rainwater.

K 104.3 Minimum Water Quality. Upon initial system startup, the quality of the water for the intended application shall be verified at the point(s) of use as determined by the Authority Having Jurisdiction in accordance with Section K 104.3.1 and Section K 104.3.2. Water quality maintenance shall be in accordance with Section K 104.3.3.

K 104.3.1 Private Potable Water System. In the absence of water quality requirements determined by the Authority Having Jurisdiction, the minimum water quality for a private potable water system at the point of use shall comply with Table K 104.3.1.

494 2025 CALIFORNIA PLUMBING CODE

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

APPENDIX K

TABLE K 104.3.1

MINIMUM WATER QUALITY

Escherichia coli (fecal coliform) Non-detectable

Protozoan Cysts Non-detectable

Viruses Non-detectable

Turbidity <0.3 NTU

K 104.3.2 Public Use Occupancies. The minimum water quality for a potable water system for public use occupancies at the point of use and testing procedures shall comply with the Environmental Protection Agency (EPA) Safe Drinking Water Act for a public water sys tem.

K 104.3.3 Maintenance. Normal system maintenance shall require system testing for Escherichia coli (fecal coliform) and turbidity every 3 months in accordance with Table K 104.3.3. Upon failure of the fecal coliform test, the system shall be re-commissioned involving cleaning, and retesting in accordance with Section K 104.3. Testing for viruses and cysts shall occur once after 3 months of initial operation and once every 12 months thereafter.

Exception: Upon failure of the virus or cyst test, the tests will be repeated every 3 months until the tests results are negative for two consecutive tests.

TABLE K 104.3.3

MINIMUM SYSTEM MAINTENANCE REQUIREMENTS

Escherichia coli (fecal coliform) Non-detectable

Turbidity <0.3 NTU

K 104.4 Water Quality Devices and Equipment. Devices and equipment used to treat rainwater to maintain the minimum water quality requirements determined by the Authority Having Jurisdiction shall be listed or labeled (thirdparty certified) by a listing agency (accredited conformity assessment body) and approved for the intended application.

K 104.4.1 Filtration Devices. Potable water filters shall comply with NSF/ANSI 53 and shall be installed in accordance with the manufacturer’s installation instructions.

Escherichia coli (fecal coliform)	Non-detectable
Protozoan Cysts	Non-detectable
Viruses	Non-detectable
Turbidity	<0.3 NTU

Escherichia coli (fecal coliform)	Non-detectable
Turbidity	<0.3 NTU

Frequently asked questions

Who is the "Authority Having Jurisdiction" (AHJ)?

The AHJ is the legally appointed enforcement agency (or agency official) charged with enforcing the California Plumbing Code in a given jurisdiction; it has authority to interpret the code, adopt supplemental rules, appoint deputies/inspectors, and request other officials’ assistance (§ 103.0) .

How do I know if a state agency (not my city) enforces the code for my building?

Check the BSC scope and application categories in § 1.2.1 and the matrix adoption tables — they list state buildings, universities, and other categories where a state or specified agency is the enforcing body rather than local government (§ 1.2.1) .

Can the AHJ waive a mandatory plumbing requirement if it’s impractical?

No — the AHJ may interpret and clarify code application and may adopt supplemental rules consistent with the code’s intent, but cannot waive mandatory requirements explicitly provided in the code (§ 103.0) .

Are code inspectors personally liable for enforcement actions?

When acting in good faith and without malice, officials enforcing the code are protected from personal liability for damages arising from acts or omissions in performing their duties under § 103.0 .

The AHJ asked for a technical report — is that allowed?

Yes. The AHJ has authority to require technical opinions, reports, and descriptive details to determine compliance; such submittals are commonly required for engineered or alternate systems (see § 103.0 and Appendix C guidance) .

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