CPC · California Plumbing Code
Special fixtures, special‑use sinks, and special‑purpose connections
If you plan to install an ornamental fountain, aquarium, baptistery, or a restaurant special‑use sink, the CPC requires AHJ approval for fixtures needing water/waste connections, sheet‑metal sinks must be bonderized or galvanized at not less than No.16 gauge and properly braced, and special fixtures must be made of approved corrosion‑resistant materials (see §§ 406.1–406.3) .
Last reviewed: July 6, 2026
What the code requires — 2-4 sentences
The California Plumbing Code requires that special fixtures and specialties that need water or waste connections be reviewed and approved by the Authority Having Jurisdiction before installation (§ 406.1). Special‑use sinks in restaurant kitchens and similar settings are permitted to be constructed of approved bonderized or galvanized sheet steel not less than No. 16 U.S. gauge (0.0635 in / 1.6 mm) and must be adequately designed, constructed and braced (§ 406.2). Special‑use fixtures must be made of approved materials (soapstone; chemical stoneware; copper‑based or nickel‑based alloys; corrosion‑resistant steel; or other materials suited to the use) (§ 406.3) .
The single most important rule: submit any baptistery, ornamental pond, aquarium, fountain basin, or similar fixture that requires a water or waste connection to the Authority Having Jurisdiction for approval before installing it (§ 406.1) .
Requirements in detail
Scope & approach
- Special fixtures — includes items such as baptisteries, ornamental and lily ponds, aquaria, ornamental fountain basins, and similar items that require water and/or waste connections. These installations must be submitted for approval prior to installation (§ 406.1) .
- Special‑use sinks — restaurant and other high‑demand sinks have specific permitted materials and minimum thickness requirements; sheet‑metal sinks must be properly designed and braced (§ 406.2) .
- Special‑use fixtures — list of acceptable materials for fixtures exposed to corrosive or specialized conditions is specified (soapstone, chemical stoneware, copper/nickel alloys, corrosion‑resistant steel, or other appropriate materials) (§ 406.3) .
Decision table — what to check when planning an installation
| Decision factor | Requirement / value | When it applies | Code Reference |
|---|---|---|---|
| Approval before install | Must submit for approval to the Authority Having Jurisdiction | Baptisteries, ornamental/lily ponds, aquaria, ornamental fountain basins, and similar fixtures that require water, waste, or both | § 406.1 |
| Sheet‑metal sinks — permitted materials | Approved bonderized or galvanized sheet steel | Restaurant kitchen sinks and other special‑use sinks | § 406.2 |
| Sheet‑metal sinks — minimum thickness | Not less than No. 16 U.S. gauge (0.0635 in / 1.6 mm) | Applies to permitted sheet‑metal special‑use sinks | § 406.2 |
| Sheet‑metal sinks — structural requirements | Must be adequately designed, constructed, and braced in an approved manner | All sheet‑metal plumbing fixtures used as special‑use sinks | § 406.2 |
| Materials for special‑use fixtures | Use soapstone; chemical stoneware; copper‑based alloy; nickel‑based alloy; corrosion‑resistant steel; or other materials suited for intended use | Fixtures subject to corrosive or specialized service | § 406.3 |
Design & approval notes
- The requirement in § 406.1 is procedural: regardless of material, if the fixture resembles the listed types and needs water/waste connections, it must be submitted for AHJ approval before installation .
- For sheet‑metal sinks, meeting No. 16 gauge (0.0635 in / 1.6 mm) is a minimum; the Code also requires the fixture be adequately braced — plan support framing and fastenings accordingly (§ 406.2) .
- The materials listed in § 406.3 are examples of acceptable durable, corrosion‑resistant materials; the Code allows “other materials suited for the intended use” when appropriate, but such choices are subject to the AHJ’s approval (§ 406.3) .
Exceptions & special cases
- The Code text for § 406.1–406.3 does not list specific numerical exceptions; instead it requires submission for approval and lists permitted materials and minimum gauge. If a proposed material or construction is not explicitly listed (for example, a composite material or a different gauge of sheet metal), it must be justified and submitted to the Authority Having Jurisdiction for approval under § 406.1 and the material rules of § 406.3 .
- The Code permits “other materials suited for the intended use” for special‑use fixtures; however, when the Code does not explicitly address a material, the AHJ’s approval is required under § 406.1 and § 406.3 .
- Note: The provided CPC excerpts include § 406.4 addressing zinc alloy components (standards/listing), but the user requested control of § 406.0–406.3 specifically. If you need guidance on zinc alloy components (§ 406.4), say so and I will include it with the applicable citation .
Common mistakes
- Failing to submit the installation of an ornamental fountain, aquarium, or baptistery for AHJ approval before installing — noncompliance with § 406.1 is a frequent oversight .
- Using sheet‑metal sinks thinner than No. 16 gauge or assuming all stainless or sheet metals are permitted without checking the minimum gauge and approval requirements — violates § 406.2 .
- Omitting structural bracing or using inadequate support for sheet‑metal fixtures — the Code explicitly requires sheet‑metal fixtures be adequately designed, constructed and braced (§ 406.2) .
- Selecting a material for a special‑use fixture that is not corrosion‑resistant or not justified for its intended use without AHJ approval — reference § 406.3 for acceptable materials and the AHJ approval path for alternatives .
Worked example
Scenario: A restaurant owner wants to install a new three‑compartment dish sink assembly fabricated from bonderized sheet steel.
- Identify the rule: Restaurant kitchen sinks fall under special‑use sinks governed by § 406.2 .
- Material & thickness check: The sink must be of approved bonderized or galvanized sheet steel and not less than No. 16 U.S. gauge (0.0635 in / 1.6 mm). If the proposed sink is fabricated from No. 16 or thicker bonderized steel, the material requirement is met; if it is No. 18 or another thinner gauge, it does not meet the minimum in § 406.2 and is noncompliant .
- Structural check: Ensure the sink assembly is adequately designed, constructed and braced (supports, hangers, backstops, reinforcing where required) per § 406.2. Document bracing details on the submittal drawings .
- Approval process: Prepare submittal documents (plans showing materials, gauge, bracing, connections, and waste routing) and submit them to the Authority Having Jurisdiction if the installation would be considered a “specialty” or if the AHJ requires preapproval (especially if the sink is an unusual custom assembly). While § 406.2 permits the materials, § 406.1 establishes the AHJ submission requirement for fixtures/specialties that require water and/or waste connections (if the sink assembly design could be considered a specialty) .
- Outcome: If the AHJ accepts the material/gauge and the bracing, proceed with installation; if not, revise materials/design per AHJ direction.
Related provisions
- § 406.1 (Water and Waste Connections) — submission to Authority Having Jurisdiction for baptisteries, ponds, aquaria, ornamental fountain basins, and similar fixtures .
- § 406.2 (Special‑Use Sinks) — permitted sheet‑metal materials and minimum No. 16 gauge requirement; design/bracing requirement .
- § 406.3 (Special‑Use Fixtures) — acceptable materials list for special‑use fixtures (soapstone; chemical stoneware; copper/nickel alloys; corrosion‑resistant steel; other materials suited for intended use) .
- (The Code also contains § 406.4 on zinc alloy components; this was present in the retrieved document if you want guidance on zinc alloy standards and listings) .
Code references
Grounded in the retrieved California Plumbing Code — click a citation to read the verbatim passage:
CPC § 406.0 High relevance — show source text
60 2025 CALIFORNIA PLUMBING CODE
), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.
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 High 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.
60 2025 CALIFORNIA PLUMBING CODE
), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.
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 § 403.3 High relevance — show source text
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
2025 CALIFORNIA PLUMBING CODE xxix
), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.
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
Temperature for Public Lavatories . . . . . . . . . . . . . . . . . . . .61
407.4 Transient Public Lavatories . . . . . .61
407.5 Waste Outlet . . . . . . . . . . . . . . . . . .61
407.6 Overflow . . . . . . . . . . . . . . . . . . . . .61
408.0 Showers . . . . . . . . . . . . . . . . . . . . .61
408.1 Application . . . . . . . . . . . . . . . . . . .61
408.2 Tileable Shower Receptors . . . . . .61
408.3 Water Consumption . . . . . . . . . . . .61
408.4 Individual Shower and
Tub-Shower Combination
Control Valves . . . . . . . . . . . . . . . .62
408.5 Waste Outlet . . . . . . . . . . . . . . . . . .62
408.6 Finished Curb or Threshold . . . . . .62
408.7 Shower Compartments . . . . . . . . . .62
408.8 Lining for Showers and Receptors . . . . . . . . . . . . . . . . . . . .62
408.9 Public Shower Floors . . . . . . . . . . .63
408.10 Location of Valves and Heads . . . . .63
408.11 Water Supply Riser . . . . . . . . . . . .63
409.0 Bathtubs and Whirlpool Bathtubs . . . . . . . . . . . . . . . . . . . . .63
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
2025 CALIFORNIA PLUMBING CODE xxix
), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.
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 § 6.980 Medium relevance — show source text
900|≥6.980|≥5.000|NA|NA| |Water
source
electri-
cally
operated
positive
displace-
ment|≥300
and
<600|≤0.6421
FL
≤0.5474
IPLV.IP|≤0.6563
FL
≤0.4305
IPLV.IP|75/655|NA|NA|NA|≥3.900|NA|NA|NA|6.850|6.850| |Water
source
electri-
cally
operated
positive
displace-
ment|≥600|≤0.5895
FL
≤0.5263
IPLV.IP|≤0.6143
FL
≤0.3990
IPLV.IP|54/445|≥4.930|≥3.960|≥2.970|NA|≥8.900|≥6.980|≥5.000|NA|NA| |Water
source
electri-
cally
operated
positive
displace-
ment|≥600|≤0.5895
FL
≤0.5263
IPLV.IP|≤0.6143
FL
≤0.3990
IPLV.IP|75/655|NA|NA|NA|≥3.900|NA|NA|NA|6.850|6.850| |Water
source
electri-
cally
operated
centrifu-
gal|<75|≤0.6421
FL
≤0.5789
IPLV.IP|≤0.7316
FL
≤0.4632
IPLV.IP|54/445|≥4.640|≥3.680|≥2.680|NA|≥8.330|≥6.410|≥4.420|NA|AHRI
550/590| |Water
source
electri-
cally
operated
centrifu-
gal|<75|≤0.6421
FL
≤0.5789
IPLV.IP|≤0.7316
FL
≤0.4632
IPLV.IP|75/655|NA|NA|NA|≥3.550|NA|NA|NA|≥6.150|≥6.150| |Water
source
electri-
cally
operated
centrifu-
gal|≥75
and
<150|≤0.5895
FL
≤0.5474
IPLV.IP|≤0.6684
FL
≤0.4211
IPLV.IP|54/445|≥4.640|≥3.680|≥2.680|NA|≥8.330|≥6.410|≥4.CPC § 3-5 Medium relevance — show source text
304 Business Group B. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
305 Educational Group E . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
306 Factory Group F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
307 High-Hazard Group H . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
308 Institutional Group I . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
309 Mercantile Group M. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
310 Residential Group R. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
311 Storage Group S. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
312 Utility and Miscellaneous Group U . . . . . . . . . . . . . . 3-18
313 Laboratories Group L [SFM]. . . . . . . . . . . . . . . . . . . . . . .3-19
314 Organized Camps Group C [SFM]. . . . . . . . . . . . . . . . . .3-19
CHAPTER 4 SPECIAL DETAILED REQUIREMENTS
BASED ON OCCUPANCY AND USE . . . . . . . . . . . . . . . . . . . .4-1
401 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
402 Covered Mall and Open Mall Buildings . . . . . . . . . . . . 4-5
403 High-Rise Buildings and Group I-2 Occupancies Having Occupied Floors Located More Than 75 Feet above the Lowest Level of
Fire Department Vehicle Access . . . . . . . . . . . . . . . 4-9
404 Atriums. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
405 Underground Buildings . . . . . . . . . . . . . . . . . . . . . . . . 4-13
406 Motor-Vehicle-Related Occupancies. . . . . . . . . . . . . 4-15
407 Group I-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
408 Group I-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24
CPC § 4-1 Medium relevance — show source text
CHAPTER 4 SPECIAL DETAILED REQUIREMENTS
BASED ON OCCUPANCY AND USE . . . . . . . . . . . . . . . . . . . .4-1
401 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
402 Covered Mall and Open Mall Buildings . . . . . . . . . . . . 4-5
403 High-Rise Buildings and Group I-2 Occupancies Having Occupied Floors Located More Than 75 Feet above the Lowest Level of
Fire Department Vehicle Access . . . . . . . . . . . . . . . 4-9
404 Atriums. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
405 Underground Buildings . . . . . . . . . . . . . . . . . . . . . . . . 4-13
406 Motor-Vehicle-Related Occupancies. . . . . . . . . . . . . 4-15
407 Group I-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
408 Group I-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24
409 Motion Picture Projection Rooms . . . . . . . . . . . . . . . 4-30
410 Stages, Platforms and Technical Production Areas. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-31
411 Special Amusement Areas . . . . . . . . . . . . . . . . . . . . . . 4-32
412 Aircraft-Related Occupancies . . . . . . . . . . . . . . . . . . . 4-33
413 Combustible Storage . . . . . . . . . . . . . . . . . . . . . . . . . . 4-37
414 Hazardous Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-37
415 Groups H-1, H-2, H-3, H-4 and H-5 . . . . . . . . . . . . . . . 4-42
416 Spray Application of Flammable Finishes . . . . . . . . 4-51
417 Drying Rooms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-52
418 Organic Coatings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-52
419 Artificial Decorative Vegetation . . . . . . . . . . . . . . . . . 4-52
California Plumbing Code Medium relevance — show source text
e**|MAXIMUM CANTILEVER SPAN
(uplift force at backspan support in lb)d, e|MAXIMUM CANTILEVER SPAN
(uplift force at backspan support in lb)d, e|MAXIMUM CANTILEVER SPAN
(uplift force at backspan support in lb)d, e|MAXIMUM CANTILEVER SPAN
(uplift force at backspan support in lb)d, e|MAXIMUM CANTILEVER SPAN
(uplift force at backspan support in lb)d, e|MAXIMUM CANTILEVER SPAN
(uplift force at backspan support in lb)d, e|MAXIMUM CANTILEVER SPAN
(uplift force at backspan support in lb)d, e|MAXIMUM CANTILEVER SPAN
(uplift force at backspan support in lb)d, e|MAXIMUM CANTILEVER SPAN
(uplift force at backspan support in lb)d, e|MAXIMUM CANTILEVER SPAN
(uplift force at backspan support in lb)d, e| |MEMBER & SPACING|** Ground snow load**|** Ground snow load**|** Ground snow load**|** Ground snow load**|** Ground snow load**|** Ground snow load**|** Ground snow load**|** Ground snow load**|** Ground snow load**|** Ground snow load**|** Ground snow load**|** Ground snow load**| |MEMBER & SPACING|≤ 20 psf|≤ 20 psf|≤ 20 psf|30 psf|30 psf|30 psf|** 50 psf**|** 50 psf**|** 50 psf**|70 psf|70 psf|70 psf| |MEMBER & SPACING|** Roof width**|** Roof width**|** Roof width**|** Roof width**|** Roof width**|** Roof width**|** Roof width**|** Roof width**|** Roof width**|** Roof width**|** Roof width**|** Roof width**| |MEMBER & SPACING|24 ft|32 ft|40 ft|24 ft|32 ft|40 ft|24 ft|32 ft|40 ft|24 ft|32 ft|40 ft| |2 × 8 @ 12″|20″
(177)|15″
(227)|—|18″
(209)|—|—|—|—|—|—|—|—| |2 × 10 @ 16″|29″
(228)|21″
(297)|16″
(364)|26″
(271)|18″
(354)|—|20″
(375)|—|—|—|—|—| |2 × 10 @ 12″|36″
(166)|26″
(219)|20″
(270)|34″
(198)|22″
(263)|16″
(324)|26″
(277)|—|—|19″
(356)|—|—| |2 × 12 @California Plumbing Code Medium relevance — show source text
53
47|195
134
107
92
82|276
190
152
131
116|590
406
326
279
247|1060
730
586
502
445|1680
1150
925
791
701|3490
2400
1930
1650
1460| |60
70
80
90
100|60
70
80
90
100|10
NA
NA
NA
NA|21
19
18
17
16|42
39
36
34
32|74
68
63
59
56|105
96
90
84
79|224
206
192
180
170|403
371
345
324
306|635
585
544
510
482|1320
1220
1130
1060
1000| |125
150
175
200
250|125
150
175
200
250|NA
NA
NA
NA
NA|14
13
12
11
NA|28
26
24
22
20|50
45
41
39
34|70
64
59
55
48|151
136
125
117
103|271
245
226
210
1CPC § 2.0 Medium relevance — show source text
0|2.0|2.0| |Washfountain|11⁄2|––|2.0|2.0| |Washfountain|2|––|3.0|3.0| |Mobilehome or Manufactured Home, trap_10_|3|6.0|––|––| |Receptor, indirect waste1,3|11⁄2|See footnote1,3|See footnote1,3|See footnote1,3| |Receptor, indirect waste1,4|2|See footnote1,4|See footnote1,4|See footnote1,4| |Receptor, indirect waste1|3|See footnote1|See footnote1|See footnote1| |Sinks|––|––|––|––| |Bar|11⁄2|1.0|––|––| |Bar2|11⁄2|––|2.0|2.0| |Clinical|3|––|6.0|6.0| |Commercial with food waste2|11⁄2|––|3.0|3.0| |Exam Room|11⁄2|––|1.0|––| |Special Purpose2|11⁄2|2.0|3.0|3.0| |Special Purpose|2|3.0|4.0|4.0| |Special Purpose|3|––|6.0|6.0| |Kitchen, domestic2
(with or without food waste disposer, dishwasher, or both)|11⁄2|2.0|2.0|––| |Laundry2 (with or without discharge from a clothes washer)|11⁄2|2.0|2.0|2.0| |Service or Mop Basin|2|––|3.0|3.0| |Service or Mop Basin|3|––|3.0|3.0| |Service, flushing rim|3|––|6.0|6.0| |Wash, each set of faucets|––|––|2.0|2.0| |Nonwater Urinal with Drain Cleansing Action|2|1.0|1.0|1.0| |Urinal, integral trap 1.0 GPF2|2|2.0|2.0|5.0| |Urinal, integral trap greater than 1.0 GPF|2|2.0|2.0|6.0| |Urinal, exposed trap2|11⁄2|2.0|2.0|5.0| |Water Closet, 1.6 GPF Gravity Tank6|3|3.0|4.0|6.0| |Water Closet, 1.6 GPF Flushometer Tank6|3|3.0|4.0|6.0| |Water Closet, 1.6 GPF Flushometer Valve6|3|3.0|4.0|6.0|2025 CALIFORNIA PLUMBING CODE 167
), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.
SANITARY DRAINAGE
TABLE 702.1 DRAINAGE FIXTURE UNIT VALUES (DFU) (continued)
CPC § 702.1 Medium relevance — show source text
SANITARY DRAINAGE
TABLE 702.1 DRAINAGE FIXTURE UNIT VALUES (DFU)
PLUMBING APPLIANCES, APPURTENANCES, OR FIXTURES MINIMUM SIZE TRAP
AND TRAP ARM7
(inches)PRIVATE PUBLIC ASSEMBLY8 Bathtub or Combination Bath/Shower 11⁄2 2.0 2.0 –– Bidet 11⁄4 1.0 –– –– Bidet 11⁄2 2.0 –– –– Clothes Washer, domestic, standpipe5 2 3.0 3.0 3.0 Dental Unit, cuspidor 11⁄4 –– 1.0 1.0 Dishwasher, domestic, with independent drain2 11⁄2 2.0 2.0 2.0 Drinking Fountain or Water Cooler 11⁄4 0.5 0.5 1.0 Food Waste Disposer, commercial 2 –– 3.0 3.0 Floor Drain, emergency 2 –– 0.0 0.0 Floor Drain (for additional sizes see Section 702.0) 2 2.0 2.0 2.0 Shower, single-head trap 29 2.0 2.0 2.0 Multi-head, each additional 2 1.0 1.0 1.0 Lavatory 11⁄4 1.0 1.0 1.0 Lavatories in sets 11⁄2 2.0 2.0 2.0 Washfountain 11⁄2 –– 2.0 2.0 Washfountain 2 –– 3.0 3.0 Mobilehome or Manufactured Home, trap_10_ 3 6.0 –– –– Receptor, indirect waste1,3 11⁄2 See footnote1,3 See footnote1,3 See footnote1,3 Receptor, indirect waste1,4 2 See footnote1,4 See footnote1,4 See footnote1,4 Receptor, indirect waste1 3 See footnote1 See footnote1 See footnote1 Sinks –– –– –– –– Bar 11⁄2 1.0 –– –– Bar2 11⁄2 –– 2.0 2.0 Clinical 3 –– 6.0 6.0 Commercial with food waste2 11⁄2 –– 3.0 3.0 Exam Room 11⁄2 –– 1.0 –– Special Purpose2 11⁄2 2.0 3.0 3.0 Special Purpose 2 3.0 4.0 4.0 Special Purpose 3 –– 6.0 6.0 Kitchen, domestic2
(with or without food waste disposer, dishwasher, or both)11⁄2 2.0 2.0 –– Laundry2 (with or without discharge from a clothes washer) 11⁄2 2.0 2.0 2.0 Service or Mop Basin 2 –– 3.0 3. CPC § 420.4 Medium relevance — show source text
420.4 Waste Outlet. Kitchen and laundry sinks shall have a waste outlet and fixture tailpiece not less than 1 [1] ⁄ 2 inches (40 mm) in diameter. Service sinks shall have a waste outlet and fixture tailpiece not less than 2 inches (50 mm) in diameter. Fixture tailpieces shall be constructed from the materials specified in Section 701.2 for drainage piping. Waste outlets shall be provided with an approved strainer.
421.0 Floor Sinks.
421.1 Application. Floor sinks shall comply with ASME A112.6.7.
421.2 Strainers. The waste outlet of a floor sink shall be provided with an approved strainer or grate that is removable and accessible.
422.0 Minimum Number of Required Fixtures. 422.1 Fixture Count. Plumbing fixtures shall be provided for the type of building occupancy and in the minimum number shown in Table 422.1. The total occupant load and occu
TABLE 420.3
COMMERCIAL PRE-RINSE SPRAY VALVE MAXIMUM FLOW RATE
For SI units: 1 gallon per minute = 3.785 L/min, 1 ounce-force = 0.278 N
<
2025 CALIFORNIA PLUMBING CODE 67
), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.
PLUMBING FIXTURES AND FIXTURE FITTINGS
Exceptions [Not adopted for OSHPD 1, 2, 3, 4 & 5] : (1) Residential installations. (2) In occupancies with a total occupant load of 10 or less, including customers and employees, one toilet facility, designed for use by no more than one person at a time, shall be permitted for use by both sexes. (3) In business and mercantile occupancies with a total occupant load of 50 or less including customers and employees, one toilet facility, designed for use by no more than one person at a time, shall be permitted for use by both sexes. (4) Separate facilities shall not be required where rooms have fixtures designed for use by both sexes and the water closets are installed in privacy compartments. Urinals shall be located in a privacy compartment [BSC & DSA-SS] , as defined, or separate private area and be visually separated from the remainder of the room. Water closet and urinal compartments shall comply with sections 422.6 and 422.7 respectively. 422.2.1 Single Use Facilities. Single use toilet facilities, bathing facilities, and family or assisted use toilet facilities shall be identified with signage indicating use by either sex. 422.2.2 Family or Assisted-Use Toilet Facilities. Where a separate toilet facility is required for each sex, and each toilet facility is required to have only one water closet, two family or assisted-use toilet facilities shall be permitted in place of the required separate toilet facilities. 422.3 Fixture Requirements for Special Occupancies. Additional fixtures shall be permitted to be required where unusual environmental conditions or referenced activities are encountered. In food preparation areas, fixture requirements shall be permitted to be dictated by health codes. 422.3.1 [OSHPD 1, 2, 3, 4, 5 & 6] Separate toilet facil- ities shall be provided for the use of patients, staff per- sonnel and visitors.
Frequently asked questions
Do I always have to submit an ornamental fountain for approval?
Yes. Any baptistery, ornamental or lily pond, aquarium, ornamental fountain basin, or similar fixture that requires a water or waste connection must be submitted to the Authority Having Jurisdiction for approval prior to installation (§ 406.1) .
Is stainless steel allowed instead of bonderized/galvanized sheet steel for a restaurant sink?
The Code permits approved bonderized or galvanized sheet steel not less than No. 16 gauge for special‑use sinks (§ 406.2). Stainless steel is not listed in § 406.2, but § 406.3 allows other materials suited for the intended use for special‑use fixtures; using stainless would require AHJ approval if it’s not explicitly covered in a given subsection (§ 406.2–406.3) .
What gauge is the minimum for permitted sheet‑metal special‑use sinks?
Minimum is No. 16 U.S. gauge (0.0635 inches / 1.6 mm) as specified in § 406.2 .
If I choose a nonlisted material for a special‑use fixture, what should I do?
You must demonstrate the material is suited for the intended use and submit the proposal to the Authority Having Jurisdiction for approval (see the combined intent of § 406.1 and § 406.3) .
Does § 406.2 say how to brace sheet‑metal sinks?
§ 406.2 requires that sheet‑metal plumbing fixtures be adequately designed, constructed, and braced in an approved manner, but it does not provide prescriptive bracing details; design drawings and details should be provided to the AHJ for approval as required (§ 406.2) .
More in California Plumbing Code
- Administration
- Definitions
- General Regulations
- Plumbing Fixtures and Fixture Fittings
- Water Heaters
- Water Supply and Distribution
- Sanitary Drainage (Drain, Waste, and Vent)
- Indirect Wastes
- Vents
- Traps and Interceptors
- Storm Drainage
- Fuel Gas Piping
- Health Care Facilities — Medical Gas and Medical Vacuum Systems
- Alternate Water Sources and Nonpotable Rainwater Catchment Systems
Ask about the CPC
Get cited, plain-English answers on the California Plumbing Code for your project — any code section, any scenario.
Start Free Trial