CPC · California Plumbing Code

What listing/standard requirements apply to pipes, fittings, fixtures and devices?

Summary: The California Plumbing Code requires that all plumbing pipes, fittings, fixtures and devices be third‑party listed to the code‑referenced standards and carry manufacturer/standard markings; unusual materials need AHJ approval. **§ 301.2** and **§ 301.2.2**.

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Last reviewed: July 6, 2026

What the code requires — 2-4 sentences

The California Plumbing Code requires that pipe, pipe fittings, traps, fixtures, materials, and devices used in a plumbing system be listed (third‑party certified) by an accredited listing agency and comply with the applicable recognized standards referenced in the code — and be free from defects (see § 301.2). Standards called out in the code (and the portion of each standard that applies) govern which grades/weights/configurations are acceptable; unusual materials may be used only with AHJ approval (§ 301.2.2).

The single most important rule: any pipe, fitting, fixture or device installed in a plumbing system must be listed/third‑party certified to an applicable recognized standard referenced in the CPC unless the Authority Having Jurisdiction approves an alternative. § 301.2

Requirements in detail

Listing / third‑party certification (what “listed” means)

Listed (third‑party certified): Products must be certified by an accredited conformity assessment body (a listing agency) as complying with the referenced standard used in the code. § 301.2
Authority Having Jurisdiction (AHJ): Where the code does not otherwise provide, materials may need prior submission and approval by the AHJ before installation. § 301.2

Marking / identification

Every length of pipe and every pipe fitting, trap, fixture, material, and device must be marked with the markings required by the applicable referenced standard and the manufacturer’s mark or name so the manufacturer is readily identified. Field markings are not acceptable. § 301.2.1
Exception: nipples formed by cutting and threading approved pipe do not require the marking. § 301.2.1

How to apply the referenced standards

Standards listed or referred to in the code cover allowable materials when used within the code’s limits; when a standard covers multiple grades/weights/configurations, you must use the portion of the standard that is applicable. § 301.2.2
The code provides a consolidated list of referenced plumbing standards in Table 1701.1; apply the listed standard as indicated in the specific section that references it. § 301.2.2 and Table 1701.1

Material‑specific requirements (examples called out in the code)

Plastic pipe and fittings (non‑gas): Must comply with NSF/ANSI 14. § 301.2.3
Cast‑iron soil pipe, fittings and hubless couplings: Must be third‑party certified in accordance with ASTM C1277 and CISPI 310 for couplings, and ASTM A888, ASTM A74, and CISPI 301 for pipes and fittings. § 301.2.4

Quick decision table

Decision item	Required value / action	Code Reference
Product acceptance	Listed (third‑party certified) to an applicable standard	§ 301.2
Marking on product	Manufacturer mark + any markings required by referenced standard; no field markings	§ 301.2.1
Which standard to use	Use the applicable portion of the standard referenced in the code and in Table 1701.1	§ 301.2.2; Table 1701.1
Plastic pipe (non‑gas)	NSF/ANSI 14 compliance required	§ 301.2.3
Cast‑iron soil pipe & couplings	ASTM C1277, CISPI 310, ASTM A888, ASTM A74, CISPI 301 (third‑party certified)	§ 301.2.4
AHJ alternative approval	AHJ may approve special designs/materials with adequate documentation/testing	§ 301.2.2; § 301.3

Exceptions & special cases

AHJ discretion: Designs or materials not provided for in the code may be allowed if the AHJ is satisfied of adequacy (requires submittal/documentation). § 301.2.2 and § 301.3.
Marking exception: Nipples cut and threaded from approved pipe are exempt from the marking requirement. § 301.2.1.
Material‑specific exceptions: The code notes some standards apply only to certain uses (for example, 301.2.3 excludes plastic components for gas). § 301.2.3.
Existing buildings: The AHJ has discretionary powers to permit deviations for alterations/repairs in existing buildings, again subject to review. § 301.2.5.

Common mistakes

Assuming “listed” means “manufacturer‑tested” — the CPC requires third‑party listing (an accredited listing agency), not only manufacturer self‑certification. § 301.2.
Installing an unmarked part — products must carry required standard markings and the manufacturer’s mark; field marking is not acceptable (except nipples). § 301.2.1.
Using the whole text of a referenced standard when only a portion applies — the code requires using the applicable portion of a referenced standard for the specific material/grade/configuration. § 301.2.2.
Forgetting to check Table 1701.1 — many product types point to a specific standard in that table (apply the standard the code section references). § 301.2.2 and Table 1701.1.

Worked example — selecting/accepting a PEX water distribution pipe (concrete scenario)

Scenario: You are the plumbing contractor specified to install SDR 9 PEX tubing for potable hot/cold water.

Step 1 — Listing: Confirm the PEX tubing is listed (third‑party certified) by an accredited listing agency to an applicable standard referenced in the CPC. If no third‑party listing exists, the product is not acceptable under § 301.2.

Step 2 — Standard: For plastic piping the code requires that plastic pipe, fittings and components (other than gas) comply with NSF/ANSI 14 per § 301.2.3. Verify the PEX listing references NSF/ANSI 14 (or the specific standard the code cites for that product in Table 1701.1) and that the listing covers the SDR/size you plan to use. § 301.2.3; Table 1701.1.

Step 3 — Marking: Check the pipe has the required markings — manufacturer’s name/mark and the standard designation (e.g., NSF/ANSI 14 and the specific ASTM/AWWA designation) cast, stamped, or indelibly marked on each length. Field marking is not acceptable. § 301.2.1.

Step 4 — AHJ / special approvals: If the PEX is a nonstandard configuration or uses a joining method not explicitly covered by the listed standard, prepare documentation/tests for the AHJ; the AHJ can allow an alternate only after being satisfied of adequacy per § 301.2.2 and § 301.3.

Numeric check: If the pipe is 1" SDR 9 PEX, confirm the manufacturer‑marking and listing cover 1" size and the application (potable water) — the code requires listing and marking for each product length/size. § 301.2; § 301.2.1.

Related provisions

§ 301.2.1 — Marking requirements for pipe, fittings, fixtures and devices.
§ 301.2.3 — Plastic pipe, plastic pipe fittings, and components (NSF/ANSI 14).
§ 301.2.4 — Cast‑iron soil pipe, fittings and hubless couplings (ASTM / CISPI requirements).
§ 301.2.5 — Existing buildings — AHJ discretion for deviations.
§ 301.3 — Alternate materials and methods; requirements for proof of equivalency and testing.
Table 1701.1 — The code’s list of referenced plumbing standards (apply standard as indicated).

Code references

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

CPC § 301.2 High relevance — show source text
301.2 Minimum Standards. Pipe, pipe fittings, traps, fixtures, material, and devices used in a plumbing system shall be listed (third-party certified) by a listing agency (accredited conformity assessment body) as complying with the approved applicable recognized standards referenced in this code, and shall be free from defects. Unless otherwise provided for in this code, materials, fixtures, or devices used or entering into the construction of plumbing systems, or parts thereof shall be submitted to the Authority Having Jurisdiction for approval prior to being installed. 301.2.1 Marking. Each length of pipe and each pipe fitting, trap, fixture, material, and device used in a plumbing system shall have cast, stamped, or indelibly marked on it any markings required by the applicable referenced standards and listing agency, and the manufacturer’s mark or name, which shall readily identify the manufacturer to the end user of the product. Where required by the approved standard that applies, the product shall be marked with the weight and the quality of the product. Materials and devices used or entering into the construction of plumbing and drainage systems, or parts thereof shall be marked and identified in a manner satisfactory to the Authority Having Jurisdiction. Such marking shall be done by the manufacturer. Field markings shall not be acceptable.

Exception: Markings shall not be required on nipples created from cutting and threading of approved pipe.

301.2.2 Standards. Standards listed or referred to in this chapter or other chapters cover materials that will conform to the requirements of this code, where used in accordance with the limitations imposed in this or other chapters thereof and their listing. Where a standard covers materials of various grades, weights, quality, or configurations, the portion of the listed standard that is applicable shall be used. Design and materials for special conditions or materials not provided for herein shall be permitted to be used by special permission of the Authority Having Jurisdiction after the Authority Having Jurisdiction has been satisfied as to their adequacy. A list of plumbing standards that appear in specific sections of this code is referenced in Table 1701.1. Standards referenced in Table 1701.1 shall be applied as indicated in the applicable referenced section. A list of additional approved standards, publications, practices, and guides that are not referenced in specific sections of this code appear in Table 1701.2. An IAPMO Installation Standard is referenced in Appendix I for the convenience of the users of this code. It is not considered as a part of this code unless formally adopted as such by the Authority Having Jurisdiction.

301.2.3 Plastic Pipe, Plastic Pipe Fittings, and Components. Plastic pipe, plastic pipe fittings, and components other than those for gas shall comply with NSF/ANSI 14.

301.2.4 Cast-Iron Soil Pipe, Fittings, and Hubless Couplings. Cast-iron soil pipe, fittings, and hubless couplings shall be third party certified in accordance with ASTM C1277 and CISPI 310 for couplings and ASTM A888, ASTM A74, and CISPI 301 for pipes and fittings. 301.2.5 Existing Buildings. In existing buildings or premises in which plumbing installations are to be altered, repaired, or renovated, the Authority Having Jurisdiction has discretionary powers to permit deviation from the provisions of this code, provided that such proposal to deviate is first submitted for proper determination in order that health and safety requirements, as they pertain to plumbing, shall be observed.
CPC § 301.3.1 High relevance — show source text
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
323.0
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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 47

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48 2025 CALIFORNIA PLUMBING CODE

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CHAPTER 3

GENERAL REGULATIONS

301.0 General.

301.1 Applicability. This chapter shall govern the general requirements, not specific to other chapters, for the installation of plumbing systems. 301.2 Minimum Standards. Pipe, pipe fittings, traps, fixtures, material, and devices used in a plumbing system shall be listed (third-party certified) by a listing agency (accredited conformity assessment body) as complying with the approved applicable recognized standards referenced in this code, and shall be free from defects. Unless otherwise provided for in this code, materials, fixtures, or devices used or entering into the construction of plumbing systems, or parts thereof shall be submitted to the Authority Having Jurisdiction for approval prior to being installed. 301.2.1 Marking. Each length of pipe and each pipe fitting, trap, fixture, material, and device used in a plumbing system shall have cast, stamped, or indelibly marked on it any markings required by the applicable referenced standards and listing agency, and the manufacturer’s mark or name, which shall readily identify the manufacturer to the end user of the product. Where required by the approved standard that applies, the product shall be marked with the weight and the quality of the product. Materials and devices used or entering into the construction of plumbing and drainage systems, or parts thereof shall be marked and identified in a manner satisfactory to the Authority Having Jurisdiction. Such marking shall be done by the manufacturer. Field markings shall not be acceptable.

Exception: Markings shall not be required on nipples created from cutting and threading of approved pipe.

301.2.2 Standards. Standards listed or referred to in this chapter or other chapters cover materials that will conform to the requirements of this code, where used in accordance with the limitations imposed in this or other chapters thereof and their listing. Where a standard covers materials of various grades, weights, quality, or configurations, the portion of the listed standard that is applicable shall be used.
CPC § 31-2022 High relevance — show source text
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

(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 § 7.3 High relevance — show source text
3|7.3|9.9|14.6| |26|NP|NP|NP|NP|13.2|22.4|NP|NP|5.0|8.5|11.4|16.9| |28|NP|NP|NP|NP|15.1|25.7|NP|NP|5.7|9.7|13.1|19.4| |30|NP|NP|NP|NP|17.2|NP|NP|NP|6.5|11.0|14.9|22.0| |32|NP|NP|NP|NP|19.4|NP|NP|NP|7.3|12.4|16.8|24.8| |34|NP|NP|NP|NP|21.7|NP|NP|NP|8.2|13.9|18.8|NP| |36|NP|NP|NP|NP|24.1|NP|NP|NP|9.1|15.4|20.9|NP| |For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon per minute = 0.063 L/s, 1 pound per square inch = 6.895 kPa.
NP = Not Permitted. Pressure loss exceeds reasonable limits.
a. Values are applicable for underground piping materials listed in_ the California Plumbing Code_ and are based on an SDR of 11 and a Hazen Williams C Factor of 150.
b. Values include the following length allowances for fittings: 25-percent length increase for actual lengths up to 100 feet and 15-percent length increase for actual lengths over
100 feet.
c. Flow rate from Section P2904.4.2. Add 5 gpm to the flow rate required by Section_R309.3.4.2_ where the water service pipe supplies more than one dwelling.|For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon per minute = 0.063 L/s, 1 pound per square inch = 6.895 kPa.
NP = Not Permitted. Pressure loss exceeds reasonable limits.
a. Values are applicable for underground piping materials listed in_ the California Plumbing Code_ and are based on an SDR of 11 and a Hazen Williams C Factor of 150.
b. Values include the following length allowances for fittings: 25-percent length increase for actual lengths up to 100 feet and 15-percent length increase for actual lengths over
100 feet.
c. Flow rate from Section P2904.4.2. Add 5 gpm to the flow rate required by Section_R309.3.4.2_ where the water service pipe supplies more than one dwelling.|For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon per minute = 0.063 L/s, 1 pound per square inch = 6.895 kPa.
NP = Not Permitted. Pressure loss exceeds reasonable limits.
a. Values are applicable for underground piping materials listed in_ the California Plumbing Code_ and are based on an SDR of 11 and a Hazen Williams C Factor of 150.
b. Values include the following length allowances for fittings: 25-percent length increase for actual lengths up to 100 feet and 15-percent length increase for actual lengths over
100 feet.
c. Flow rate from Section P2904.4.2.
CPC § 101.3.2 High relevance — show source text
** No permit for a rainwater catchment system requiring a permit shall be issued until complete plumbing plans, with data satisfactory to the Authority Having Jurisdiction, have been submitted and approved. No changes or connections shall be made to either the rainfall catchment or the potable water system within a site containing a rainwater catchment water system without approval by the Authority Having Jurisdiction. K 101.3.2 System Changes. No changes or connections shall be made to either the rainwater catchment system or the potable water system within a site containing a rainwater catchment system requiring a permit without approval by the Authority Having Jurisdiction. K 101.4 Product and Material Approval. System components shall be properly identified as to the manufacturer. K 101.4.1 Plumbing Materials and Systems. Pipe, pipe fittings, traps, fixtures, material, and devices used in a potable rainwater system shall be listed or labeled (thirdparty certified) by a listing agency (accredited conformity assessment body) and shall be in accordance with approved applicable recognized standards referenced within this code, and shall be free from defects. Unless otherwise provided for in this appendix, materials, fixtures, or devices used or entering into the construction of plumbing systems, or parts thereof shall be submitted to the Authority Having Jurisdiction for approval.

K 101.5 Maintenance and Inspection. Potable rainwater catchment systems and components shall be inspected and maintained in accordance with Section K 101.5.1 through Section K 101.5.3.

K 101.5.1 Frequency. Potable rainwater catchment systems and components shall be inspected and maintained in accordance with Table K 101.5.1 unless more

frequent inspection and maintenance are required by the manufacturer.

K 101.5.2 Maintenance Log. A maintenance log for potable rainwater catchment systems shall be maintained by the property owner and be available for inspection. The property owner or designated appointee shall ensure that a record of testing, inspection, and maintenance in accordance with Table K 101.5.1 is maintained in the log. The log will indicate the frequency of inspection, and maintenance of each system. A record of the required water quality tests shall be retained for not less than 2 years.

K 101.5.3 Maintenance Responsibility. The required maintenance and inspection of potable rainwater catchment systems shall be the responsibility of the property owner unless otherwise required by the Authority Having Jurisdiction.

K 101.6 Operation and Maintenance Manual. An operation and maintenance manual for potable rainwater catchment systems shall be supplied to the building owner by the system designer. The operating and maintenance manual shall include the following:

(1) Detailed diagram of the entire system and the location of system components.

(2) Instructions for operating and maintaining the system.

(3) Details on maintaining the required water quality as determined by the Authority Having Jurisdiction.

(4) Details on deactivating the system for maintenance, repair, or other purposes.

(5) Applicable testing, inspection, and maintenance frequencies in accordance with Table K 101.5.1.

(6) A method of contacting the manufacturer(s).

CPC § 14.3 High relevance — show source text

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REFERENCED STANDARDS

TABLE 1701.1 (continued) REFERENCED STANDARDS

STANDARD NUMBER	STANDARD TITLE	APPLICATION	REFERENCED SECTION
ASME A112.14.6-2010 (R2019)	FOG (Fats, Oils, and Greases) Disposal Systems	Fixtures	1015.2, Table 1009.1
ASME A112.18.1- 2018/CSA B125.1-2018	Plumbing Supply Fittings	Fittings	408.4, 417.1, 417.2, 417.3, 417.4, 417.6, 603.5.20
ASME A112.18.2- 2020/CSA B125.2-2020	Plumbing Waste Fittings	Fittings	404.1, 408.5
ASME A112.18.3-2002 (R2017)	Backflow Protection Devices and Systems in Plumbing Fixture Fittings	Backflow Protection	417.3, 417.4
ASME A112.18.6-2017/ CSA B125.6-2017 (R2021)	Flexible Water Connectors	Piping	604.5, 604.13
ASME A112.18.8-2020	Sanitary Waste Valves for Plumbing Drainage Systems	Sanitary Waste Valves	814.4
ASME A112.18.9-2011 (R2017)	Protectors/Insulators for Exposed Waste and Supplies on Accessible Fixtures	Miscellaneous	403.3
ASME A112.19.1- 2018/CSA B45.2-2018	Enameled Cast Iron and Enameled Steel Plumbing Fixtures	Fixtures	407.1, 408.1, 409.1, 415.1, 420.1
ASME A112.19.2- 2018/CSA B45.1-2018	Ceramic Plumbing Fixtures	Fixtures	407.1, 408.1, 409.1, 410.1, 411.1, 412.1, 415.1, 420.1
ASME A112.19.3- 2017/CSA B45.4-2017	Stainless Steel Plumbing Fixtures	Fixtures	407.1, 408.1, 409.1, 410.1, 411.1, 415.1, 420.1
ASME A112.19.5- 2017/CSA B45.15-2017	Flush Valves and Spuds for Water Closets, Urinals, and Tanks	Fixtures	413.3
ASME A112.19.7- 2020/CSA B45.

CPC § 420.1 High relevance — show source text

2025 CALIFORNIA PLUMBING CODE 345

REFERENCED STANDARDS

TABLE 1701.1 (continued) REFERENCED STANDARDS

STANDARD NUMBER	STANDARD TITLE	APPLICATION	REFERENCED SECTION
CSA B45.11-2017/IAPMO Z401-2017 (R2021)	Glass Plumbing Fixtures	Fixtures	407.1
CSA B45.12-2013/IAPMO Z402-2013 (R2018)	Aluminum and Copper Plumbing Fixtures	Fixtures	407.1, 408.1, 409.1, 420.1
ASME A112.19.5- 2017/CSA B45.15-2017	Flush Valves and Spuds for Water Closets, Urinals, and Tanks	Fixtures	413.3
ASME A112.4.2-2021/CSA B45.16-2021	Personal Hygiene Devices for Water Closets	Fixtures	411.4
CSA B64.1.1-2021	Atmospheric Vacuum Breakers (AVB)	Backflow Protection	Table 603.2
CSA B64.1.2-2021	Pressure Vacuum Breakers (PVB)	Backflow Protection	Table 603.2
CSA B64.2.1.1-2021	Hose Connection Dual Check Vacuum Breakers (HCDVB)	Backflow Protection	Table 603.2
CSA B64.4-2021	Reduced Pressure Principle (RP) Backflow Preventers	Backflow Protection	Table 603.2
CSA B64.4.1-2021	Reduced Pressure Principle Backflow Preventers for Fire Pro- tection Systems (RPF)	Backflow Protection	Table 603.2
CSA B64.5-2021	Double Check Valve (DCVA) Backflow Preventers	Backflow Protection	Table 603.2
CSA B64.5.1-2021	Double Check Valve Backflow Preventers for Fire Protection Systems (DCVAF)	Backflow Protection	Table 603.2
CSA B79-2008 (R2018)	Commercial and Residential Drains and Cleanouts	Fixtures	418.1, Table 707.2
ASME A112.18.1- 2018/CSA B125.1-2018	Plumbing Supply Fittings	Fittings	408.4, 417.1, 417.2, 417.3, 417.4, 417.6, 603.5.20
ASME A112.18.

CPC § 604.1.2 High relevance — show source text
(4) Trenches having a depth greater than 24 inches.

Installers of CPVC pipe within residential struc- tures shall use non-latex thin gauge (4 millime- ters) nitrile gloves, or other gloves providing an equivalent or better degree of protection during the installation of the CPVC plumbing system. Gloves shall be provided to all workers by the contractor, or plumbing subcontractor, and shall be replaced upon contamination by cements.

604.1.2 PEX. [HCD 1 & HCD 2] All installations of PEX pipe where it is the initial plumbing piping installed in new construction shall be flushed twice over a period of at least one week. The pipe system shall be first flushed for at least 10 minutes and then filled and allowed to stand for no less than 1 week, after which all the branches of the pipe system must be flushed long enough to fully empty the contained volume. This provision shall not apply to the installation of PEX pipe where it replaces an existing pipe system of any material.

(1) At the time of fill, each fixture shall have a remov- able tag applied stating:

(a) “This new plumbing system was first filled and _flushed on ______ (date) by ____________ (name). The State of California requires that the system be flushed after standing at least one week after the fill date specified above. If this system is used earlier than one week after the fill date, the water must be allowed to run for at least two minutes prior to use for human con- sumption. This tag may not be removed prior to the completion of the required second flushing, except by the building owner or occupant.”

(2) Prior to issuing a building permit to install PEX pipe, the building official shall require as part of the permitting process that the contractor, or the appro- priate plumbing subcontractors, provide written cer- tification that he or she will comply with the flushing procedures set forth in the code.

(3) The building official shall not give final permit approval of any PEX plumbing installation unless he or she finds that the material has been installed in compliance with the requirements of the code, includ- ing the requirements to flush and tag the systems.

(4) Any contractor or subcontractor found to have failed to comply with the PEX flushing requirements shall be subject to the penalties in Health and Safety Code, Division 13, Part 1.5, Chapter 6 (Section 17995, et seq.).

604.2 Lead Content. The maximum allowable lead content in pipes, pipe fittings, plumbing fittings, and fixtures intended to convey or dispense water for human consumption shall be not more than a weighted average of 0.25 percent with respect to the wetted surfaces of pipes, pipe fittings, plumbing fittings,

and fixtures. For solder and flux, the lead content shall be not more than 0.2 percent where used in piping systems that convey or dispense water for human consumption.

Note: See Sections 116875 and 116876 of the Health and Safety Code for the maximum lead content of pipes, pipe or plumbing fittings, or fixtures intended to convey or dispense water for human consumption.

Exceptions:

(1) Pipes, pipe fittings, plumbing fittings, fixtures, or backflow preventers used for nonpotable services such as manufacturing, industrial processing, irrigation, outdoor watering, or any other uses where the water is not used for human consumption.
CPC § 811.0. High relevance — show source text
defined in Section 811.0.

903.2.3 Marking. Copper or copper alloy tubing, in addition to the required incised marking, shall be marked in accordance with either ASTM B306 or ASTM B88. The colors shall be Type K, green; Type L, blue; Type M, red; and Type DWV, yellow. 903.3 Changes in Direction. Changes in the direction of vent piping shall be made by the appropriate use of approved fittings, and no such pipe shall be strained or bent. Burred ends shall be reamed to the full bore of the pipe.

904.0 Size of Vents.

904.1 Size. The size of vent piping shall be determined from its length and the total number of fixture units connected thereto, in accordance with Table 703.2. The diameter of an individual vent shall be not less than 1 [1] ⁄ 4 inches (32 mm) nor less than one-half the diameter of the drain to which it is connected. In addition, the drainage piping of each building and each connection to a public sewer or a private sewage disposal system shall be vented by means of one or more vent pipes, the aggregate cross-sectional area of which shall be not less than that of the largest required building sewer as determined from Table 703.2. Vent pipes from fixtures located upstream from pumps, ejectors, backwater valves, or other devices that obstruct the free flow of air and other gases between the building sewer and the outside atmosphere shall not be used for meeting the cross-sectional area venting requirements of this section. Exception: Where connected to a common building sewer, the drainage piping of two or more buildings located on the same lot and under one ownership shall be permitted to be vented by means of piping sized in accordance with Table 703.2, provided the aggregate cross-sectional area of vents is not less than that of the largest required common building sewer. 904.2 Length. Not more than one-third of the total permitted length, in accordance with Table 703.2, of a minimumsized vent shall be installed in a horizontal position. Where a minimum-sized vent is increased one pipe size for its entire length, the maximum length limitation shall not apply.

2025 CALIFORNIA PLUMBING CODE 189

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VENTS

905.0 Vent Pipe Grades and Connections. 905.1 Grade. Vent and branch vent pipes shall be free from drops or sags, and each such vent shall be level or shall be so graded and connected as to drip back by gravity to the drainage pipe it serves. 905.2 Horizontal Drainage Pipe. Where vents connect to a horizontal drainage pipe, each vent pipe shall have its invert taken off above the drainage centerline of such pipe downstream of the trap being served. 905.3 Vent Pipe Rise. Unless prohibited by structural conditions, each vent shall rise vertically to a point not less than 6 inches (152 mm) above the flood-level rim of the fixture served before offsetting horizontally, and where two or more vent pipes converge, each such vent pipe shall rise to a point not less than 6 inches (152 mm) in height above the floodlevel rim of the plumbing fixture it serves before being connected to any other vent. Vents less than 6 inches (152 mm) above the flood-level rim of the fixture shall be installed with approved drainage fittings, material, and grade to the drain.
CPC § 801.4 High relevance — show source text
The piping from the equipment to the receptor shall be not less than the drain on the unit and in no case less than [1] ⁄ 2 of an inch (15 mm).

801.4 Bar and Fountain Sink Traps. Where the sink in a bar, soda fountain, or counter is so located that the trap serving the sink cannot be vented, the sink drain shall discharge through an air gap or air break (see Section 801.3.3) into an approved receptor that is vented. The developed length from the fixture outlet to the receptor shall not exceed 5 feet (1524 mm). 801.5 Connections from Water Distribution System. Indirect waste connections shall be provided for drains, overflows, or relief pipes from potable water pressure tanks, water heaters, boilers, and similar equipment that is connected to the potable water distribution system. Such indirect waste connections shall be made using a water-distribution air gap constructed in accordance with Table 603.3.1.

801.6 Sterilizers. Lines, devices, or apparatus such as stills, sterilizers, and similar equipment requiring waste connections and used for sterile materials shall be indirectly connected using an air gap. Each such indirect waste pipe shall be separately piped to the receptor and shall not exceed 15 feet (4572 mm). Such receptors shall be located in the same room. 801.7 Drip or Drainage Outlets. Appliances, devices, or apparatus not regularly classified as plumbing fixtures, but which have a drip or drainage outlets, shall be permitted to be drained by indirect waste pipes discharging into an open receptor through either an air gap or air break (see Section 801.3.1).

802.0 Approvals. 802.1 General. No plumbing fixtures served by indirect waste pipes or receiving discharge therefrom shall be installed until first approved by the Authority Having Jurisdiction.

803.0 Indirect Waste Piping.

803.1 Materials. Pipe, tube, and fittings conveying indirect waste shall be of such materials and design as to perform their intended function to the satisfaction of the Authority Having Jurisdiction.

803.2 Copper and Copper Alloys. Joints and connections in copper and copper alloy pipe and tube shall be installed in accordance with Section 705.3.

803.3 Pipe Size and Length. Except as hereinafter provided, the size of indirect waste piping shall be in accordance with other sections of this code applicable to drainage and vent piping. No vent from indirect waste piping shall combine with a sewer-connected vent. Vents from indirect waste piping shall extend separately to the outside air. Indirect waste pipes exceeding 5 feet (1524 mm), but less than 15 feet (4572 mm) in length shall be directly trapped, but such traps need not be vented.

Indirect waste pipes less than 15 feet (4572 mm) in length shall be not less than the diameter of the drain outlet or

2025 CALIFORNIA PLUMBING CODE 181

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INDIRECT WASTES

tailpiece of the fixture, appliance, or equipment served, and in no case less than [1] ⁄ 2 of an inch (15 mm). Angles and changes of direction in such indirect waste pipes shall be provided with cleanouts to permit flushing and cleaning.

804.0 Indirect Waste Receptors.

**804.1 Standpipe Receptors.

CPC § 1501.7 High relevance — show source text

348 2025 CALIFORNIA PLUMBING CODE

REFERENCED STANDARDS

TABLE 1701.1 (continued) REFERENCED STANDARDS

STANDARD NUMBER	STANDARD TITLE	APPLICATION	REFERENCED SECTION
IAPMO/ANSI Z601-2018	Scale Reduction Devices	Water Conditioning, Water Treatment	611.1.2
ANSI/CAN/IAPMO Z1001- 2021	Prefabricated Gravity Grease Interceptors	Fixtures	Table 1009.1, 1014.1,

CPC § 409.6.1 High relevance — show source text
1, 409.6.1| |ASME A112.19.12-2014
(R2019)|Wall Mounted, Pedestal Mounted, Adjustable, Elevating, Tilt-
ing, and Pivoting Lavatory, Sink, and Shampoo Bowl Carrier
Systems and Drain Waste Systems|Fixtures|407.1, 420.1| |ASME A112.19.14-2013
(R2018)|Six-Liter Water Closets Equipped with a Dual Flushing Device|Fixtures|411.2.1| |ASME A112.19.15-2012
(R2017)|Bathtubs/Whirlpool Bathtubs with Pressure Sealed Doors|Fixtures|409.1| |ASME A112.19.19-2016
(R2021)|Vitreous China Nonwater Urinals|Fixtures|412.1, 412.1.2| |ASSE 1002-2020/ASME
A112.1002-2020/CSA
B125.12-2020|Anti-Siphon Fill Valves for Water Closet Tanks|Backflow Protection|413.3, Table 603.2| |ASME A112.36.2M-1991
(R2017)|Cleanouts|DWV Components|Table 707.2, 707.4.1| |ASSE 1016-2017/ASME
A112.1016-2017/CSA
B125.16-2017|Automatic Compensating Valves for Individual Showers and
Tub/Shower Combinations|Valves|408.4, 408.4.2(1)| |ASSE 1037-2020/ASME
A112.1037-2020/CSA
B125.37-2020|Pressurized Flushing Devices for Plumbing Fixtures|Backflow Protection|413.2| |ASSE 1070-2020/ASME
A112.1070-2020/CSA
B125.70-2020|Water Temperature Limiting Devices|Valves|407.3(1), 409.4(1),
410.3(1), 417.7(1),
417.8| |ASME B1.20.1-2013
(R2018)|Pipe Threads, General Purpose (Inch)|Joints|605.1.5, 605.2.3,
605.5.2, 605.12.3,
705.1.3, 705.3.4,
705.4.2, 705.6.3,
1208.5.8, 1322.5(2)| |ASME B16.1-2020|Gray Iron Pipe Flanges and Flanged Fittings: Classes 25, 125,
and 250|Fittings|1208.5.11.1|

336 2025 CALIFORNIA PLUMBING CODE

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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.

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.

Frequently asked questions

What does “listed” mean in practice?

It means the product has been evaluated and certified by an accredited third‑party listing agency to the applicable recognized standard referenced by the CPC (not just manufacturer self‑declaration). § 301.2

If a product is not marked, can I mark it in the field?

No. The code requires manufacturer marking (cast, stamped, or indelible) and field markings are not acceptable; the AHJ may require removal or approval. § 301.2.1

Where do I find which standard a given fixture must meet?

Check the specific code section that regulates that fixture and Table 1701.1 for the referenced standard; use the applicable portion of the standard as required by the section. § 301.2.2 and Table 1701.1.

Can the AHJ approve a non‑listed product?

Yes — but only after the AHJ is satisfied of adequacy, typically based on technical documentation or testing demonstrating equivalency. § 301.2.2; § 301.3.

Are there special rules for plastic or cast‑iron components?

Yes. The code explicitly requires plastic piping components (non‑gas) to comply with NSF/ANSI 14 and cast‑iron soil pipe/fittings/hubless couplings to be third‑party certified to the ASTM/CISPI standards listed in the code. § 301.2.3; § 301.2.4.

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