CPC · California Plumbing Code

Fixture standards, listing, and water-conserving requirements

This hub orients readers to CPC requirements on fixture materials, listing/marking, and the water‑conserving flow and flush limits (see §§301.2, 401.3, 407.2, 411.2 and Appendices L and M).

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Last reviewed: July 6, 2026

Overview

This area of the California Plumbing Code (CPC) governs the materials, performance, installation, and certification of plumbing fixtures and fixture fittings — and sets the water‑use limits that fixtures must meet. The code requires fixtures to be constructed of durable, nonabsorbent materials and to meet water‑conserving limits (see §401.1–§401.3) as well as the marking and third‑party listing requirements for materials and devices (see §301.2).

Water‑conserving rules matter for public health, compliance, and statewide water policy: the CPC ties into CALGreen and other state laws that set maximum flow/flush rates and replacement obligations for noncompliant fixtures. For example, CALGreen prescribes specific maximum flows for toilets, showerheads, and faucets that the CPC references for enforcement and scoping.

Key places to look in the CPC are Chapter 4 (Plumbing Fixtures and Fixture Fittings) — including §401.3 (water‑conserving fixtures), the lavatory requirements in §407.2, the water‑closet performance and effective flush volume rules in §411.2, the listing/marking and approved standards language in §301.2, and the Appendix flow tables (L 402.1 and Appendix M for peak‑demand design). These sections and appendices provide the specific flow/flush limits, accepted standards, and listing/marking expectations you must follow.

In this section

Code references

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

CPC § 401.2 High 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 § 4-8 High relevance — show source text
4-8 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE

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

4 RESIDENTIAL MANDATORY MEASURES

DIVISION 4.3 – WATER EFFICIENCY AND CONSERVATION

SECTION 4.301—GENERAL

4.301.1 Scope. The provisions of this chapter shall establish the means of conserving water used indoors, outdoors and in wastewater conveyance.

SECTION 4.302—DEFINITIONS

4.302.1 Definitions. Reserved.

SECTION 4.303—INDOOR WATER USE

4.303.1 Water conserving plumbing fixtures and fittings. Plumbing fixtures (water closets and urinals) and fittings (faucets and showerheads) shall comply with Sections 4.303.1.1, 4.303.1.2, 4.303.1.3 and 4.303.1.4.

Note: All noncompliant plumbing fixtures in any residential 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 definition of a noncompliant plumbing fixture, types of residential buildings affected and other important enactment dates.

4.303.1.1 Water closets. The effective flush volume of all water closets shall not exceed 1.28 gallons per flush. Tank-type water closets shall be certified to the performance criteria of the US EPA WaterSense Specification for Tank-type Toilets.

Note: The effective flush volume of dual flush toilets is defined as the composite, average flush volume of two reduced flushes and one full flush.

4.303.1.2 Urinals. The effective flush volume of wall-mounted urinals shall not exceed 0.125 gallons per flush. The effective flush volume of all other urinals shall not exceed 0.5 gallons per flush.

4.303.1.3 Showerheads.

4.303.1.3.1 Single showerhead. Showerheads shall have a maximum flow rate of not more than 1.8 gallons per minute at 80 psi. Showerheads shall be certified to the performance criteria of the US EPA WaterSense Specification for Showerheads.

4.303.1.3.2 Multiple showerheads serving one shower. When a shower is served by more than one showerhead, the combined flow rate of all showerheads and/or other shower outlets controlled by a single valve shall not exceed 1.8 gallons per minute at 80 psi, or the shower shall be designed to allow only one shower outlet to be in operation at a time.

Note: A hand-held shower shall be considered a showerhead.

4.303.1.4 Faucets.

4.303.1.4.1 Residential lavatory faucets. The maximum flow rate of residential lavatory faucets shall not exceed 1.2 gallons per minute at 60 psi. The minimum flow rate of residential lavatory faucets shall not be less than 0.8 gallons per minute at 20 psi.
CPC § 411.0 High relevance — show source text
WATER CLOSETS . . . . . . . . . . . . . . . . . . . . . .411.0, 411.2.4

Approved standards . . . . . . . . . . . . . . . . . . . . . . . .411.1

Clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .402.5

Compartments . . . . . . . . . . . . . . . .E 501.3.2, E 501.3.3

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225.0

Effective flush volume . . . . . . . . . . . . . . . . . . . . . .411.2

Flanged fixture Connection . . . . . . . . . . . . . . . . . .402.6 Floor-mounted, back-outlet . . . . . . . . . . . . . . . . .402.6.3

Flushometer Valve Activated . . . . . . . . 411.2.2, 411.2.2.1

Manufactured/Mobile home . . . . . . . . .E 501.2, E 501.3,

Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . .411.2.3

E 501.3.1, E 501.6

Prohibited . . . . . . . . . . . . . . . . . . . . . . . . . .405.1, 910.7

Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .411.3

Water consumption . . . . . . . . . . . . . . . . .411.2, L 402.2

WATER-CONSERVING

FIXTURES AND FITTINGS . . . . . . . . . . . . . 401.3, L 402.0

WATER CONSUMPTION

Lavatories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .407.2

Showerhead & body sprays . . . . . . . . . . . .408.2, 408.3

Water closets . . . . . . . . . . . . . . . . . . . . . . . . . . . . .411.2

WATER HAMMER ARRESTORS . . . . . . . . . .225.0, 609.11

WATER HEATERS . . . . . . . . . . . . . . . . . . . . . . . .Chapter 5

Access . . . . . . . . . . . . . . . . . . . . . . . .504.3.1, 507.13.2,

507.25, 508.4

CPC § 1.11.0. High relevance — show source text

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

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APPENDIX M

PEAK WATER DEMAND CALCULATOR

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

M 101.0 General.

M 101.1 Applicability. This appendix provides an alterna- tive method for estimating the demand load for the building water supply and principal branches for single- and multifamily dwellings with water-conserving plumbing fixtures, fixture fittings, and appliances.

M 102.0 Demand Load.

M 102.1 Water-Conserving Fixtures. Plumbing fixtures, fixture fittings, and appliances shall not exceed the design flow rate in Table M 102.1.

TABLE M 102.1

DESIGN FLOW RATE FOR WATER-CONSERVING PLUMBING

FIXTURES AND APPLIANCES IN RESIDENTIAL OCCUPANCIES

FIXTURE AND APPLIANCE	MAXIMUM DESIGN FLOW RATE (gallons per minute)
Bar Sink	1.5
Bathtub	5.5
Bidet	2.0
Clothes Washer	3.5
Combination Bath/Shower	5.5
Dishwasher	1.3
Kitchen Faucet	1.8
Laundry Faucet (with aerator)	2.0
Lavatory Faucet	1.2
Shower, per head	1.8
Water Closet, 1.28 GPF Gravity Tank	3.0

For SI units: 1 gallon per minute = 0.06 L/s

M 102.2 Water Demand Calculator. The estimated design flow rate for the building supply and principal branches and risers shall be determined by the IAPMO Water Demand Calculator available for download at http://www.iapmo.org/ WEStand/Pages/WaterDemandCalculator.aspx

M 102.3 Meter and Building Supply. To determine the design flow rate for the water meter and building supply, enter the total number of indoor plumbing fixtures and appliances for the building in Column [B] of the Water Demand Calculator and run Calculator. See Table M 102.3 for an example.

M 102.4 Fixture Branches and Fixture Supplies. To determine the design flow rate for fixture branches and risers, enter the total number of plumbing fixtures and appliances

TABLE M 102.1

DESIGN FLOW RATE FOR WATER-CONSERVING PLUMBING

FIXTURES AND APPLIANCES IN RESIDENTIAL OCCUPANCIES

CPC § 401.2 High relevance — show source text
401.2 Quality of Fixtures . . . . . . . . . . . . .59

401.3 Water-Conserving Fixtures and Fittings . . . . . . . . . . . . . . . . . . .59

402.0 Installation . . . . . . . . . . . . . . . . . . .59

402.1 Cleaning . . . . . . . . . . . . . . . . . . . . .59

402.2 Joints . . . . . . . . . . . . . . . . . . . . . . .59

402.3 Securing Fixtures . . . . . . . . . . . . . .59

402.4 Wall-Hung Fixtures . . . . . . . . . . . . .59

402.5 Setting . . . . . . . . . . . . . . . . . . . . . .59

402.6 Flanged Fixture Connections . . . . .59

402.7 Supply Fittings . . . . . . . . . . . . . . . .60

402.8 Installation . . . . . . . . . . . . . . . . . . .60

402.9 Design and Installation of Plumbing Fixtures . . . . . . . . . . . . . .60

402.10 Slip Joint Connections . . . . . . . . . .60

402.11 Future Fixtures . . . . . . . . . . . . . . . .60

403.0 Accessible Plumbing Facilities . . . .60

403.1 General . . . . . . . . . . . . . . . . . . . . . .60

403.2 Fixtures and Fixture Fittings for Persons with Disabilities . . . . . .60

403.3 Exposed Pipes and Surfaces . . . . .60

404.0 Waste Fittings and Overflows . . . . .60

404.1 Waste Fittings . . . . . . . . . . . . . . . . .60

404.2 Overflows . . . . . . . . . . . . . . . . . . . .60

405.0 Prohibited Fixtures . . . . . . . . . . . . .60

405.1 Prohibited Water Closets . . . . . . . .60

405.2 Prohibited Urinals . . . . . . . . . . . . . .60

405.3 Miscellaneous Fixtures . . . . . . . . . .60

406.0 Special Fixtures and Specialties . . .61

406.1 Water and Waste Connections . . . .61

406.2 Special Use Sinks . . . . . . . . . . . . .61

406.3 Special Use Fixtures . . . . . . . . . . .61

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TABLE OF CONTENTS

406.4 Zinc Alloy Components . . . . . . . . .61

407.0 Lavatories . . . . . . . . . . . . . . . . . . . .61

407.1 Application . . . . . . . . . . . . . . . . . . .61

407.2 Water Consumption . . . . . . . . . . . .61

407.3 Limitation of Hot Water
CPC § 501.3.1 Medium relevance — show source text
E 501.3.1, E 501.6

Prohibited . . . . . . . . . . . . . . . . . . . . . . . . . .405.1, 910.7

Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .411.3

Water consumption . . . . . . . . . . . . . . . . .411.2, L 402.2

WATER-CONSERVING

FIXTURES AND FITTINGS . . . . . . . . . . . . . 401.3, L 402.0

WATER CONSUMPTION

Lavatories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .407.2

Showerhead & body sprays . . . . . . . . . . . .408.2, 408.3

Water closets . . . . . . . . . . . . . . . . . . . . . . . . . . . . .411.2

WATER HAMMER ARRESTORS . . . . . . . . . .225.0, 609.11

WATER HEATERS . . . . . . . . . . . . . . . . . . . . . . . .Chapter 5

Access . . . . . . . . . . . . . . . . . . . . . . . .504.3.1, 507.13.2,

507.25, 508.4

Approval requirements . . . . . . . . . . . . . . . . . . . . . .501.1 Approved standards . . . . . .Table 501.1(1), 505.3, 505.4 Clearances. . . . . . . . . . . . . . . . . . . . . . 504.3 – 504.3.2,

508.1, 508.2.1

Combustion air required . . . . . . . . . . . . . . . . . . . .506.0

Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . .604.13

Dual purpose, definition . . . . . . . . . . . . . . . . . . . .225.0

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .225.0

Garages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .507.13 Inspections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .503.2

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .507.0

Location . . . . . . . . . . . . . . . . . . .504.1, 507.12 – 507.15

CPC § 302.0 Medium relevance — show source text

L 302.0 Disposal of Liquid Waste.

L 302.1 Disposal. It shall be unlawful for a person to cause, suffer, or permit the disposal of sewage, human excrement, or other liquid wastes, in a place or manner, except through and by means of an approved drainage system, installed and maintained in accordance with the provisions of this code. L 302.2 Connections to Plumbing System Required. Equipment and appliances, used to receive or discharge liquid wastes or sewage, shall be connected properly to the drainage system of the building or premises, in accordance with the requirements of this code.

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APPENDIX L

L 303.0 Abandonment.

L 303.1 General. An abandoned system or part thereof covered under the scope of this appendix shall be disconnected from remaining systems, drained, plugged, and capped in an approved manner.

L 401.0 Water Conservation and Efficiency. L 401.1 Scope. The provisions of this section establish the means of conserving potable and nonpotable water used in and around a building.

L 402.0 Water-Conserving Plumbing Fixtures and Fittings. L 402.1 General. The maximum water consumption of fixtures and fixture fittings shall comply with the flow rates specified in Table L 402.1, and Section L 402.2 through Section L 402.10.

TABLE L 402.1

MAXIMUM FIXTURE AND FIXTURE FITTINGS FLOW RATES

FIXTURE TYPE	FLOW RATE
Showerheads	2.0 gpm at 80 psi1
Kitchen faucets residential4	1.8 gpm at 60 psi
Lavatory faucets residential5	1.5 gpm at 60 psi
Lavatory faucets other than residential	0.5 gpm at 60 psi
Metering faucets	0.25 gallons/cycle
Metering faucets for wash fountains	One 0.25 gallons/cycle fixture fit- ting for each 20 inches rim space
Wash fountains	One 2.2 gpm at 60 psi fixture fit- ting for each 20 inches rim space
Water Closets	1.28 gallons/flush2
Urinals	0.5 gallons/flush3
Commercial Pre-Rinse Spray Valves	See Section L 402.9

For SI units: 1 gallon per minute = 0.06 L/s, 1 pound-force per square inch = 6.8947 kPa, 1 inch = 25.4 mm, 1 gallon = 3.785 L

Notes: 1 Shall be listed to EPA WaterSense Specification for Showerheads. For multiple showerheads serving one shower compartment see Section L

CPC § 2025 Medium relevance — show source text
Appendix I Installation Standards.

Installation standards are industry standards that specify procedures for the installation of plumbing and mechanical products, and the inspection methods and procedures employed for the examination of such systems. These comprehensive standards add detailed information and guidance that a manufacturer or product installation instructions may not fully address. These standards give the user confidence with options from industry experts for installing plumbing products and assemblies in a safe and professional manner.

Appendix J Combination of Indoor and Outdoor Combustion and Ventilation Opening Design.

Appendix J provides an example of how to determine the required combination of indoor and outdoor combustion air opening sizes for appliances. The combustion air example also provides a table that contains the required volume of a space per the appliance Btu/h input that is based on the standard method.

Appendix K Potable Rainwater Catchment Systems.

Potable rainwater catchment system is defined as a system that uses the principal of collecting and using rain from a rooftop or other man-made, aboveground collection surface. This appendix applies to new rainwater catchment installations, as well as changes, additions, maintenance, and repairs to existing installations. Rainwater harvesting is the practice of collecting the water produced during rainfall events before it has a chance to run off into a river or stream or soak into the ground and become groundwater.

Appendix L Sustainable Practices.

This appendix provides a comprehensive set of technically sound provisions that encourage sustainable practices and works toward improving the design and construction of plumbing systems that result in a positive long-term environmental impact. Environmental sustainability is important because it involves natural resources that human beings need for economic or manufactured capital. Their sustainability is defined by their reliance on infinitely available resources that are naturally occurring, constant, and free to access.

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FORMAT OF THE UNIFORM PLUMBING CODE

Appendix M Peak Water Demand Calculator.

This appendix provides a method for estimating the demand load for the building water supply and principal branches for single- and multi-family dwellings with water-conserving plumbing fixtures, fixture fittings, and appliances.

Appendix N Impact Of Water Temperature On The Potential For Scalding And Legionella Growth.

Legionnaires’ disease is a serious issue that is a threat to many citizens. It is known that the higher the temperature, the lower the risk for Legionella growth, but the higher the temperature, the higher the possibility for scalding. This appendix addresses Legionella growth potential and scald potential within specified temperature ranges. It contains definitions for terms used to describe water temperatures such as cold, tepid, warm, tempered hot, and disinfecting hot. Since plumbing systems operate within various temperature ranges, the public has a document that identifies such temperature ranges and the “potential” dangers within these temperature ranges.

Appendix O Non-Sewered Sanitation Systems.

This appendix contains provisions on non-sewered sanitation systems which are suitable for use in temporary or permanent settlements, including refugee camps, and are equally suited to both public and private use in isolated locations. Additionally, the appendix provides general safety and performance requirements for design and testing of non-sewered sanitation systems for prefabricated integrated treatment units. These systems will apply to any integrated sanitation system that is not attached to a sewer.

Appendix P Professional Qualifications.

Appendix P provides a b
CPC § 406.0 Medium relevance — show source text
60 2025 CALIFORNIA PLUMBING CODE

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PLUMBING FIXTURES AND FIXTURE FITTINGS

406.0 Special Fixtures and Specialties.

406.1 Water and Waste Connections. Baptisteries, ornamental and lily ponds, aquaria, ornamental fountain basins, and similar fixtures and specialties requiring water, waste connections, or both shall be submitted for approval to the Authority Having Jurisdiction prior to installation.

406.2 Special Use Sinks. Restaurant kitchen and other special use sinks shall be permitted to be made of approvedtype bonderized and galvanized sheet steel of not less than No. 16 U.S. gauge (0.0635 inches) (1.6 mm). Sheet-metal plumbing fixtures shall be adequately designed, constructed, and braced in an approved manner to accomplish their intended purpose.

406.3 Special Use Fixtures. Special use fixtures shall be made of one of the following:

(1) Soapstone

(2) Chemical stoneware

(3) Copper-based alloy

(4) Nickel-based alloy

(5) Corrosion-resistant steel

(6) Other materials suited for the intended use of the fixture

406.4 Zinc Alloy Components. Zinc alloy components shall comply with applicable nationally recognized standards and shall be used in accordance with their listing.

407.0 Lavatories.

407.1 Application. Lavatories shall comply with ASME A112.19.1/CSA B45.2, ASME A112.19.2/CSA B45.1, ASME A112.19.3/CSA B45.4, ASME A112.19.12, CSA B45.5/IAPMO Z124, CSA B45.8/IAPMO Z403, CSA B45.11/IAPMO Z401 or CSA B45.12/IAPMO Z402. Group wash fixtures shall comply with the requirements of Section 401.2. Every 20 inches (508 mm) of rim space of a group wash fixture shall be considered as one lavatory for determining the number of lavatories required in accordance with Table 422.1. Lavatory assemblies with automatic soap dispensers, faucets, or hand dryers shall comply with IAPMO IGC 127.

407.2 Water Consumption. The maximum water flow rate of faucets shall comply with Section 407.2.1 through Section 407.2.4 .

407.2.1 Public Lavatory Faucets . The maximum flow rate for public lavatory faucets shall not exceed 0.5 gpm at 60 psi (1.9 L/m at 414 kPa).

407.2.2 Residential Lavatory Faucets. [HCD 1] The maximum flow rate of residential lavatory faucets shall not exceed 1.2 gallons (4.54 L) per minute at 60 psi. The minimum flow rate of residential lavatory faucets shall not be less than 0.8 gallons (3.03 L) per minute at 20 psi.
CPC § 18.9 Medium relevance — show source text
Protectors, insulators, or both shall comply with ASME A112.18.9 or ASTM C1822. [HCD 1-AC] Specific requirements regard- ing accommodations for persons with disabilities are contained in Chapter 11A of the California Building Code.

404.0 Waste Fittings and Overflows. 404.1 Waste Fittings. Waste fittings shall comply with ASME A112.18.2/CSA B125.2, ASTM F409 or Table 701.2 for aboveground drainage piping and fittings. 404.2 Overflows. Where a fixture is provided with an overflow, the overflow shall comply with Section 404.2.1 or Section 404.2.2.

404.2.1 Sinks, Lavatories, and Bathtubs. The waste shall be so arranged that the standing water in the fixture shall not rise in the overflow where the stopper is closed or remain in the overflow where the fixture is empty. The overflow pipe from a fixture shall be connected to the house or inlet side of the fixture trap.

404.2.2 Water Closets and Urinals. Overflows on flush tanks shall be permitted to discharge into the water closets or urinals served by them.

405.0 Prohibited Fixtures.

405.1 Prohibited Water Closets. Water closets having an invisible seal or an unventilated space or having walls which are not thoroughly washed at each discharge shall be prohibited. A water closet that might permit siphonage of the contents of the bowl back into the tank shall be prohibited. 405.2 Prohibited Urinals. Trough urinals and urinals with an invisible seal shall be prohibited.

405.3 Miscellaneous Fixtures. Fixed wooden, or tile wash sinks for domestic use shall not be installed in a building designed or used for human habitation. No sheet metal-lined wooden bathtub shall be installed or reconnected. No dry or chemical closet (toilet) shall be installed in a building used for human habitation unless first approved by the Health Officer.

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PLUMBING FIXTURES AND FIXTURE FITTINGS

406.0 Special Fixtures and Specialties.

406.1 Water and Waste Connections. Baptisteries, ornamental and lily ponds, aquaria, ornamental fountain basins, and similar fixtures and specialties requiring water, waste connections, or both shall be submitted for approval to the Authority Having Jurisdiction prior to installation.

406.2 Special Use Sinks. Restaurant kitchen and other special use sinks shall be permitted to be made of approvedtype bonderized and galvanized sheet steel of not less than No. 16 U.S. gauge (0.0635 inches) (1.6 mm). Sheet-metal plumbing fixtures shall be adequately designed, constructed, and braced in an approved manner to accomplish their intended purpose.

406.3 Special Use Fixtures. Special use fixtures shall be made of one of the following:

(1) Soapstone

(2) Chemical stoneware

(3) Copper-based alloy

(4) Nickel-based alloy

(5) Corrosion-resistant steel

(6) Other materials suited for the intended use of the fixture

406.4 Zinc Alloy Components. Zinc alloy components shall comply with applicable nationally recognized standards and shall be used in accordance with their listing.

CPC § 101.1 Medium relevance — show source text

APPENDIX M - PEAK WATER DEMAND CALCULATOR

(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)				X
Adopt only those sections that are listed below
Chapter/Section
M 101.1				X
Table M 102.1				X

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518 2025 CALIFORNIA PLUMBING CODE

APPENDIX M

PEAK WATER DEMAND CALCULATOR

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

M 101.0 General.

M 102.0 Demand Load.

M 102.1 Water-Conserving Fixtures. Plumbing fixtures, fixture fittings, and appliances shall not exceed the design flow rate in Table M 102.1.

TABLE M 102.1

DESIGN FLOW RATE FOR WATER-CONSERVING PLUMBING

FIXTURES AND APPLIANCES IN RESIDENTIAL OCCUPANCIES

Frequently asked questions

Which CPC section requires fixtures to be listed or marked by an accredited agency?

The CPC requires that pipe, fittings, fixtures, materials, and devices be listed (third‑party certified) and properly marked per the applicable referenced standards; see §301.2 for listing, marking, and standards requirements.

What are common maximum flow/flush limits referenced in the CPC?

The CPC and its appendices reference specific limits: residential lavatory faucets (1.2 gpm at 60 psi), tank‑type water closets (effective flush volume not more than 1.28 gpf), and showerheads (limits referenced via CALGreen and Appendix L tables). See §407.2 for lavatories, §411.2 for water closets, and Table L 402.1 / CALGreen for other fixture limits.

Must existing noncompliant fixtures be replaced?

Yes — the CPC notes replacement obligations and cross‑references state law and CALGreen requirements that require noncompliant residential and certain commercial fixtures to be replaced under specified conditions (see §401.3 and the CALGreen notes). Check the cited Civil Code provisions for timing and scope.

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Related in the CPC

Fixture installation, securing, and supply/drain connections

Requirements by fixture type: lavatories, water closets, showers, sinks, and specialty fixtures

Minimum fixture counts, accessibility, and special fixtures/specialties

Plumbing Fixtures and Fixture Fittings

California Plumbing Code

Fixture standards, listing, and water-conserving requirements

Overview

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Code references

4 RESIDENTIAL MANDATORY MEASURES

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