CPC · California Plumbing Code

Shower and bathtub fitting, consumption, and referenced standards

Short version for a homeowner: Showers must use showerheads/body sprays that meet the CPC flow limits (generally **1.8 gpm** for a single outlet at 80 psi) and have valves that limit hot water to **120°F**; bathtubs and whirlpool tubs must be manufactured to the ASME/CSA standards the CPC names (whirlpools/hydromassage systems reference ASME A112.19.7). Always check the product’s certification and the CPC sections **§ 408.1**, **§ 408.3**, **§ 408.4**, and **§ 409.1** for the detailed requirements.

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Last reviewed: July 6, 2026

What the code requires — plain English

  • Manufactured shower receptors and shower bases must meet the listed fixture standards; see § 408.1.
  • Bathtubs and whirlpool bathtubs must comply with the named ASME/CSA/CSA‑IAPMO standards; see § 409.1.
  • Hydromassage / whirlpool bathtub systems are subject to the referenced standard mapping (ASME A112.19.7) called out for § 409.6.1 in the CPC referenced‑standards table; the full prose of § 409.6.1 was not present in the retrieved snippets, but the standards table ties § 409.6.1 to ASME A112.19.7.

The single most important rule: showerheads and related shower outlets have explicit maximum flow limits and showers/tubs must be manufactured/installed to the listed standards — check § 408.3 (flow/consumption) and the fixture standards referenced by § 408.1 and § 409.1.

Requirements in detail

Scope & referenced standards (what standards apply)

  • § 408.1 (showers): Manufactured shower receptors and bases must comply with the listed fixture standards (ASME A112.19.1/CSA B45.2, A112.19.2/CSA B45.1, A112.19.3/CSA B45.4, CSA B45.12/IAPMO Z402, CSA B45.5/IAPMO Z124, and IAPMO IGC 154 for prefabricated enclosures).
  • § 409.1 (bathtubs): Bathtubs must comply with ASME A112.19.1/CSA B45.2, A112.19.2/CSA B45.1, A112.19.3/CSA B45.4, CSA B45.5/IAPMO Z124, or CSA B45.12/IAPMO Z402. Whirlpool bathtubs must comply with ASME A112.19.7/CSA B45.10; pressure‑sealed doors have ASME A112.19.15.
  • The CPC's Referenced Standards Table (Table 1701.1) explicitly lists ASME A112.19.7 (Hydromassage Bathtub Systems) as applicable to § 409.1 and § 409.6.1. If you are working with hydromassage/whirlpool systems, follow that standard as the test/performance reference.

Water consumption / flow limits (decision‑relevant numbers)

The CPC sets numeric limits for shower fittings; these are the values inspectors and designers use day‑to‑day.

Item Required value (decision‑relevant) Code Reference
Maximum flow — single showerhead 1.8 gpm at 80 psi (6.81 L/min at 552 kPa) § 408.3.1
Maximum flow — body spray (residential & nonresidential) 1.8 gpm at 80 psi § 408.3
Multiple showerheads (all outlets controlled by same valve) Combined flow shall not exceed 1.8 gpm at 80 psi, or the shower must be designed so only one outlet can operate at a time § 408.3.2
Maximum hot‑water temperature (showers & tubs) 120°F (49°C) maximum at the outlet; must be limited by listed valves/devices § 408.4.2 (showers) and § 409.4 (bathtubs)
Bathtub waste outlet minimum diameter 1 1/2 inches (40 mm) § 409.2

Notes:

  • Residential showerheads and body sprays must also comply with CALGreen Division 4.3 requirements (the CPC cross‑references CALGreen for residential fitting certification).
  • The CPC cross‑references specific device/valve standards (e.g., ASSE 1016/ASME A112.1016/CSA B125.16 for automatic compensating valves) for temperature control and scald protection.

Temperature control & valves

  • Showers and tub‑shower combinations require individual control valves of the pressure balance, thermostatic, or combination type providing scald/thermal shock protection at the installed flow rate; these valves must meet ASSE 1016 / ASME A112.1016 / CSA B125.16 (or ASME A112.18.1/CSA B125.1 where specified). § 408.4 spells this out.
  • The maximum water temperature at individual showerheads and bathtub fillers is limited to 120°F (49°C) and must be enforced either by the valve settings or by listed limiting devices per the referenced standards. § 408.4.2 and § 409.4.

Fixture construction & installation points

  • Manufactured receptors: must be installed per manufacturer instructions and comply with referenced fixture standards in § 408.1.
  • Bathtubs and whirlpool tubs: meet the listed ASME/CSA/CSA‑IAPMO standards in § 409.1; whirlpool systems also point to ASME A112.19.7 through the referenced‑standards table for system requirements and testing (see Table 1701.1).
  • Location of valves and heads: control valves and showerheads shall be located so the showerhead does not discharge directly at the entrance to the compartment (so user can adjust before stepping in) — see § 408.10.

Exceptions & special cases

  • The CPC requires compliance with CALGreen for residential showerhead certification and some multiple‑outlet strategies; the CPC text points to CALGreen Division 4.3 for specific residential requirements (so a product may need EPA WaterSense certification per CALGreen). § 408.3 references CALGreen.
  • When multiple outlets are provided but the installation is designed so only one outlet can operate at a time, the combined‑flow restriction may be satisfied even if individual outlets’ aggregate nameplate flows exceed 1.8 gpm — this is specifically allowed in § 408.3.2 when designed accordingly.
  • For hydromassage / whirlpool systems: the CPC maps those systems to ASME A112.19.7 in the referenced standards table for § 409.6.1 (so check ASME A112.19.7 for performance/testing requirements). The full CPC prose of § 409.6.1 was not available in the retrieved snippets; use the referenced standard for details.

Common mistakes

  • Installing a showerhead or body spray rated above 1.8 gpm at 80 psi for a single‑outlet shower, or failing to account for combined flow of multiple outlets controlled by the same valve. Inspectors frequently see nameplate flow ignored. § 408.3 / § 408.3.2.
  • Omitting a listed temperature‑limiting device or installing a mixing valve that is not certified to the referenced standards — remember 120°F maximum at bathtub and shower outlets per § 409.4 and § 408.4.2.
  • Using non‑listed bathtub/whirlpool equipment without verifying compliance to the ASME/CSA standards cited in § 409.1 (e.g., hydromassage systems must meet ASME A112.19.7 where referenced).
  • Forgetting to size the bathtub waste/tailpiece — minimum 1½ in (40 mm) per § 409.2.

Worked example — concrete scenario

Scenario: A homeowner wants a tub‑shower with one fixed showerhead and two body sprays, all controlled by the same single mixing valve. The fixed showerhead is rated 1.0 gpm, each body spray is rated 0.6 gpm, and the hand‑held (if present) is 0.8 gpm. Determine compliance.

Step 1 — Identify control group: all four outlets (fixed head + 2 body sprays + hand‑held) are controlled by one valve. Per § 408.3.2, the combined flow of all outlets controlled by a single valve shall not exceed 1.8 gpm unless the system is designed so only one outlet can operate at a time.

Step 2 — Sum flows: 1.0 + 0.6 + 0.6 + 0.8 = 3.0 gpm. This exceeds 1.8 gpm — not allowed as configured.

Compliance options:

  • Reconfigure so only one outlet can operate at a time (diverter/design change) — permitted per § 408.3.2; or
  • Replace fittings so the total concurrent flow ≤ 1.8 gpm (for example: fixed 0.9 gpm + body sprays disabled or each ≤ 0.45 gpm when concurrent).
    Also ensure mixing valve limits outlet temperature to ≤ 120°F per § 408.4.2.

Related provisions (quick list)

  • § 408.1 — Manufactured shower receptors / referenced fixture standards.
  • § 408.3 / § 408.3.1 / § 408.3.2 — Showerflow / consumption limits and multiple‑outlet rules.
  • § 408.4 — Individual shower & tub‑shower control valve types and temperature limiting.
  • § 408.10 — Location of valves and showerheads.
  • § 408.11 — Water supply riser attachment requirements.
  • § 409.1 — Bathtub and whirlpool bathtub application and required standards.
  • § 409.2 — Bathtub waste outlet sizing.
  • § 409.4 — Limitation of hot water temperature for bathtubs/whirlpool tubs.
  • Table 1701.1 (Referenced Standards) — maps ASME A112.19.7 (Hydromassage Bathtub Systems) to § 409.1 and § 409.6.1. For hydromassage systems check ASME A112.19.7.

Code references

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

  • 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

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

    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.
  • CPC § 6-2017 High relevance — show source text

    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 B45.10-2020|Hydromassage Bathtub Systems|Fixtures|409.1, 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.

  • CPC § 420.1 High relevance — show source text

    420.1| |CSA B45.8-2018/IAPMO
    Z403-2018|Terrazzo, Concrete, Composite Stone, and Natural Stone
    Plumbing Fixtures|Fixtures|407.1, 420.1| |ASME A112.3.4-2018/CSA
    B45.9-2018|Macerating Toilet Systems and Waste-Pumping Systems for
    Plumbing Fixtures|Fixtures|710.13| |ASME A112.19.7-
    2020/CSA B45.10-2020|Hydromassage Bathtub Systems|Fixtures|409.1, 409.6.1|

    2025 CALIFORNIA PLUMBING CODE 345

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

    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 § 1501.7 High relevance — show source text

    Residential,
    and Commercial Use|Water Quality|1501.7, 1506.8,
    1506.10.2, 1603.4| |IAPMO IGC 325-2016|Oil/Water Separators Performance|Interceptors|Table 1009.1| |IAPMO PS 53-2020|Grooved Mechanical Pipe Couplings and Grooved Fittings|Fittings|Table 604.1| |IAPMO PS 65-2019a|Airgap Units for Water Conditioning Equipment Installation|Backflow Protection|611.2| |IAPMO PS 66-2015|Dielectric Fittings|Fittings|605.15, 605.16.1,
    605.16.3| |IAPMO PS 72-2019|Valves with Atmospheric Vacuum Breakers|Valves|603.5.6(5)| |IAPMO PS 76-2021|Trap Primers for Fill Valves and Flushometer Valves|DWV Components|1007.2| |IAPMO PS 80-2019|Clarifiers|Interceptors|Table 1009.1| |IAPMO PS 90-2014|Elastomeric Test Caps, Cleanout Caps, and Combination Test
    Caps/Shielded Couplings|DWV Components|Table 707.2| |IAPMO PS 104-2019|Pressure Relief Connection for Dispensing Equipment|Valves|603.5.22(1)| |IAPMO PS 106-2015el|Tileable Shower Receptors and Shower Kits|Fixtures|408.2| |IAPMO PS 117-2021|Press Connections|Fittings|Table 604.1| |CSA B45.5-2017/IAPMO
    Z124-2017|Plastic Plumbing Fixtures (with Errata dated August 2017)|Fixtures|407.1, 408.1, 409.1,
    411.1, 412.1, 420.1| |IAPMO/ANSI Z124.5-
    2013e1 (R2018)|Plastic Toilet Seats|Appurtenance|411.3| |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| |CSA B45.8-2018/IAPMO
    Z403-2018|Terrazzo, Concrete, Composite Stone, and Natural Stone
    Plumbing Fixtures|Fixtures|407.1, 420.1|

    348 2025 CALIFORNIA PLUMBING CODE

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

    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 § 6.8 High relevance — show source text

    62 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

    shall be insulated from conducting substances, other than the connecting drain, by 15 pound (6.8 kg) asphalt felt or an equivalent. Sheet lead shall be joined by burning. 408.8.4 Sheet Copper. Sheet copper shall comply with ASTM B152 and shall weigh not less than 12 ounces per square foot (oz/ft [2] ) (3.7 kg/m [2] ) or No. 24 B & S Gauge (0.02 inches) (0.51 mm). The copper sheet shall be insulated from conducting substances, other than the connecting drain, by 15 pound (6.8 kg) asphalt felt or an equivalent. Sheet copper shall be joined by brazing or soldering. 408.8.5 Tests for Shower Receptors. Shower receptors shall be tested for watertightness by filling with water to a depth of not less than 2 inches (51 mm) for not less than 15 minutes. Where no threshold is present, a 2 inch (51 mm) barrier shall be temporarily constructed for testing. The test plug shall be so placed that both upper and under sides of the subpan shall be subjected to the test at the point where it is clamped to the drain. 408.9 Public Shower Floors. Floors of public shower rooms shall have a nonskid surface and shall be drained in such a manner that wastewater from one bather shall not pass over areas occupied by other bathers. Gutters in public or gang shower rooms shall have rounded corners for easy cleaning and shall be sloped not less than 2 percent toward drains. Drains in gutters shall be spaced at a maximum of 8 feet (2438 mm) from sidewalls nor more than 16 feet (4877 mm) apart.

    408.10 Location of Valves and Heads. Control valves

    and showerheads shall be located on the sidewall of shower compartments or otherwise arranged so that the showerhead does not discharge directly at the entrance to the compartment so that the bather can adjust the valves before stepping into the shower spray. 408.11 Water Supply Riser. A water supply riser from the shower valve to the showerhead outlet, whether exposed or not, shall be securely attached to the structure.

    409.0 Bathtubs and Whirlpool Bathtubs. 409.1 Application. Bathtubs shall comply with ASME A112.19.1/CSA B45.2, ASME A112.19.2/CSA B45.1, ASME A112.19.3/CSA B45.4, CSA B45.5/IAPMO Z124, or CSA B45.12/IAPMO Z402. Whirlpool bathtubs shall comply with ASME A112.19.7/CSA B45.10. Pressure sealed doors within a bathtub or whirlpool bathtub enclosure shall comply with ASME A112.19.15. 409.2 Waste Outlet. Bathtubs and whirlpool bathtubs shall have a waste outlet and fixture tailpiece not less than 1 [1] ⁄ 2 inches (40 mm) in diameter. Fixture tailpieces shall be constructed from the materials specified in Section 701.2 for drainage piping.

  • CPC § 603.4.2 High relevance — show source text

    2, 603.4.2| |ASSE/IAPMO/ANSI 6010-
    2021|Medical Gas Systems Installers|Certification|1323.10|

    2025 CALIFORNIA PLUMBING CODE 347

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

    REFERENCED STANDARDS

    TABLE 1701.1 (continued) REFERENCED STANDARDS

    STANDARD NUMBER STANDARD TITLE APPLICATION REFERENCED
    SECTION
    ASSE/IAPMO/ANSI 6020-
    2021    		 Medical Gas Systems Inspectors Miscellaneous 1324.5.4.7,
    1324.5.6.2, 1324.5.6.5
    ASSE/IAPMO/ANSI 6030-
    2021    		 Medical Gas Systems Verifiers Miscellaneous 1324.5.4.7,
    1324.5.6.2,
    1324.5.6.5,
    1324.5.7.2
    ASSE/IAPMO/ANSI 6035-
    2021    		 Bulk Medical Gas/Cryogenic Fluid Central Supply Systems
    Verifiers    		 Miscellaneous 1324.5.7.3
    ASSE/IAPMO/ANSI Series
    7000-2020    		 Residential Potable Water Fire Sprinkler System Installers &
    Inspectors for One- and Two-Family Dwellings    		 Miscellaneous 612.1
    ASSE/IAPMO/ANSI
    12010-2021    		 Environment of Care, Infection Control and Construction Risk
    Assessment Professional Qualification Standard    		 Professional
    Qualifications    		 1303.9
    IAPMO IGC 78-2019 Drain, Waste and Vent (DWV) Internal Cleanout Fittings DWV Components Table 707.2
    IAPMO IGC 109-2019 Water Distribution Manifolds Valves 606.5.1
    IAPMO IGC 127-2018 Combined Hand-Washing Systems Fixtures 407.1, 420.1
    IAPMO IGC 154-2019 Shower and Tub/Shower Enclosures, Bathtubs with Glass Pres-
    sure-Sealed Doors, and Shower/Steam Panels    		 Fixtures 408.1
    IAPMO IGC 167-2011ae2
    (R2021)    		 Solid Waste Containment Interceptors Interceptors Table 1009.1
    IAPMO IGC 183-2016 Oil/Water Separators and Coalescing Plate Separators DWV Components Table 1009.1, 1017.2
    IAPMO IGC 196-2018 Condensate Traps and Overflow Switches for Air-Conditioning
    Systems    		 Condensate Traps 814.4
    IAPMO IGC 224-2018 ABS, PVC and Cast Iron DWV Test Fitting with Integral
    Cleanout    		 DWV Components Table 707.2
    IAPMO IGC 305-2019 ABS and PVC Horizontal Backwater Valves with Lifting
    Devices    		 Valves 710.6
    IAPMO IGC 322-2018 Alkaline Water – Drinking Water Treatment Units Miscellaneous 611.1.
  • CPC § 408.10 High relevance — show source text

    Drains in gutters shall be spaced at a maximum of 8 feet (2438 mm) from sidewalls nor more than 16 feet (4877 mm) apart.

    408.10 Location of Valves and Heads. Control valves

    and showerheads shall be located on the sidewall of shower compartments or otherwise arranged so that the showerhead does not discharge directly at the entrance to the compartment so that the bather can adjust the valves before stepping into the shower spray. 408.11 Water Supply Riser. A water supply riser from the shower valve to the showerhead outlet, whether exposed or not, shall be securely attached to the structure.

    409.0 Bathtubs and Whirlpool Bathtubs. 409.1 Application. Bathtubs shall comply with ASME A112.19.1/CSA B45.2, ASME A112.19.2/CSA B45.1, ASME A112.19.3/CSA B45.4, CSA B45.5/IAPMO Z124, or CSA B45.12/IAPMO Z402. Whirlpool bathtubs shall comply with ASME A112.19.7/CSA B45.10. Pressure sealed doors within a bathtub or whirlpool bathtub enclosure shall comply with ASME A112.19.15. 409.2 Waste Outlet. Bathtubs and whirlpool bathtubs shall have a waste outlet and fixture tailpiece not less than 1 [1] ⁄ 2 inches (40 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 stopper or strainer. 409.3 Overflow. Where overflows are provided, they shall be installed in accordance with Section 404.2.

    409.4 Limitation of Hot Water Temperature in Bath- tubs and Whirlpool Bathtubs. The maximum hot water temperature discharging from the bathtub and whirlpool bathtub filler shall be limited to 120°F (49°C). The maximum temperature shall be regulated by one of the following means:

    «

    «

    «

    «

    «

    »

    »

    »

    Shower receptors shall have the subfloor and rough side of walls to a height of not less than 3 inches (76 mm) above the top of the finished dam or threshold shall be first lined with sheet plastic, lead, or copper, or shall be lined with other durable and watertight materials. Showers that are provided with a built in place, permanent seat or seating area that is located within the shower enclosure, shall be first lined with sheet plastic, lead, copper, or shall be lined with other durable and watertight materials that extend not less than 3 inches (76 mm) above horizontal surfaces of the seat or the seating area. Lining materials shall be pitched [1] ⁄ 4 inch per foot (20.8 mm/m) to weep holes in the subdrain of a smooth and solidly formed subbase. Such lining materials shall extend upward on the rough jambs of the shower opening to a point not less than 3 inches (76 mm) above the horizontal surfaces of the seat or the seating area, the top of the finished dam or threshold and shall extend outward over the top of the permanent seat, permanent seating area, or rough threshold and be turned over and fastened on the outside face of both the permanent seat, permanent seating area, or rough threshold and the jambs.

  • CPC § 1127A.5.2.4 Medium relevance — show source text

    2. Bathtubs with removable seats. Two horizontal grab bars shall be installed on the back wall. One shall be located 33 inches (838 mm) minimum and 36 inches (914 mm) maximum above the finish floor measured to the top of the gripping surface, and the other shall be located 8 inches (203 mm) minimum and 10 inches (254 mm) maximum above the rim of the bathtub. Each grab bar shall be 24 inches (610 mm) long minimum and shall be installed 24 inches (610 mm) maxi- mum from the head end wall and 12 inches (305 mm) maximum from the control end wall.

    A grab bar 24 inches (610 mm) long minimum shall be installed on the control end wall at the front edge of the bath- tub. A grab bar 12 inches (305 mm) long minimum shall be installed on the head end wall at the front edge of the bathtub.

    1127A.5.2.4 Controls. Faucets and controls (other than drain stoppers) shall be located on an end wall between the bathtub rim and grab bar, and between the open side of the bathtub and the centerline of the width of the bathtub. (See Figure 11A-9F.)

    Controls shall be operable with one hand and shall not require tight grasping, pinching or twisting of the wrist. The force required to activate controls shall be no greater than 5 pounds (22.2 N).

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    HOUSING ACCESSIBILITY

    1127A.5.2.5 Shower spray unit. A shower spray unit with a hose at least 59 inches (1524 mm) long that can be used both as a fixed shower head and as a hand-held shower shall be provided.

    The shower spray unit shall have an on/off control with a non-positive shut-off. If an adjustable-height shower head on a verti- cal bar is used, the bar shall be installed so as not to obstruct the use of the grab bars.

    1127A.5.2.6 Bathtub enclosures. When provided, enclosures for bathtubs shall not obstruct controls, faucets, shower and spray units, or obstruct transfer from wheelchairs onto bathtub seats or into bathtubs. Enclosures on bathtubs shall not have tracks installed on the rim of the open face of the bathtub.

    1127A.5.3 Shower compartments. Shower compartments required to be accessible shall comply with this section. (See Figures 11A- 9H, 11A-9I, 11A-9J and 11A-9K.)

    1127A.5.3.1 Size and clearance.

    1. Standard roll-in shower compartments. Standard roll-in shower compartments shall meet one of the following:

    1.1. 30 inches (762 mm) minimum in depth and 60 inches (1524 mm) minimum in width between wall surfaces measured at center points of opposing sides, with a full opening width on the long side.

    A clear floor space 30 inches (914 mm) minimum by 60 inches (1524 mm) minimum shall be provided adjacent to the open face of the shower compartment.

  • CPC § 407.3 Medium relevance — show source text

    407.3 Limitation of Hot Water Temperature for Public Lavatories. Hot water delivered from public-use lavatories shall be limited to a maximum temperature of 120°F (49°C). The maximum temperature shall be regulated by one of the following means:

    (1) A limiting device conforming to either ASSE 1070/ASME A112.1070/CSA B125.70, or

    (2) A water heater conforming to ASSE 1084.

    407.4 Transient Public Lavatories. Self-closing or metering faucets shall be installed on lavatories intended to serve the transient public, such as those in, but not limited to service stations, train stations, airports, restaurants, and convention halls.

    407.5 Waste Outlet. Lavatories shall have a waste outlet and fixture tailpiece not less than 1 [1] ⁄ 4 inches (32 mm) in diameter. Continuous wastes and fixture tailpieces shall be constructed from the materials specified in Section 701.4. Waste outlets shall be provided with an approved stopper or strainer.

    407.6 Overflow. Where overflows are provided, they shall be installed in accordance with Section 404.2.

    408.0 Showers.

    408.1 Application. Manufactured shower receptors and shower bases shall comply with ASME A112.19.1/CSA B45.2, ASME A112.19.2/CSA B45.1, ASME A112.19.3/CSAB45.4, CSA B45.12/IAPMO Z402, or CSA B45.5/IAPMO Z124. Prefabricated shower enclosures shall comply with IAPMO IGC 154.

    408.2 Tileable Shower Receptors. Tileable shower receptors and shower kits shall comply with IAPMO PS 106. 408.3 Water Consumption. Showerheads shall have a « maximum flow rate of not more than 1.8 gpm at 80 psi ( 6.81 L/m at 552 kPa). Body sprays shall have a flow rate of not more than 1.8 gpm at 80 psi ( 6.81 L/m at 552 kPa). [HCD 1] Residential showerheads shall comply with Division 4.3 of the California Green Building Standards Code (CALGreen). Residential body sprays shall comply with the showerhead requirements in Division 4.3 of CALGreen. [BSC-CG & DSA-SS] Nonresidential body sprays shall comply with the showerhead requirements in Division 5.3 of CALGreen.

    408.3.1 Single Showerhead. [BSC-CG & DSA-SS] Showerheads shall have a maximum flow rate of not more than 1.8 gallons (6.81 L) per minute at 80 psi. Showerheads shall be certified to the performance crite- ria of the U.S. EPA WaterSense Specification for Show- erheads in compliance with Chapter 5, Division 5.3. of the California Green Building Standards Code (CAL- Green).

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    PLUMBING FIXTURES AND FIXTURE FITTINGS

    «

    «

    «

    **408.6 Finished Curb or Threshold.

  • CPC § 2-2020 Medium relevance — show source text

    2-2020|Plumbing Waste Fittings|Fittings|404.1, 408.5| |CSA B125.3-2018|Plumbing Fittings|Fittings|409.4(1), 410.3(1)| |CSA B125.5-2011/IAPMO
    Z600-2011 (R2016)|Flexible Water Connectors with Excess Flow Shut-off Device|Miscellaneous|604.5| |ASME A112.18.6-
    2017/CSA B125.6-2017
    (R2021)|Flexible Water Connectors|Piping|604.5, 604.13| |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 A112.4.14-
    2017/CSA B125.14-2017|Manually Operated Valves for Use in Plumbing Systems|Valves|606.1| |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| |CSA B137.1-2020|Polyethylene (PE) Pipe, Tubing, and Fittings for Cold-Water
    Pressure Services|Piping|Table 604.1| |CSA B137.5-2020|Crosslinked Polyethylene (PEX) Tubing Systems for Pressure
    Applications|Piping|Table 604.1| |CSA B137.6-2020|Chlorinated Polyvinylchloride (CPVC) Pipe, Tubing, and Fit-
    tings for Hot- and Cold-Water Distribution Systems (with
    Update No. 1)|Piping, Fittings|Table 604.1| |CSA B137.9-2020|Polyethylene/Aluminum/Polyethylene (PE-AL-PE) Composite
    Pressure-Pipe Systems|Piping|Table 604.1|

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    REFERENCED STANDARDS

    TABLE 1701.1 (continued) REFERENCED STANDARDS

    STANDARD NUMBER STANDARD TITLE APPLICATION REFERENCED
    SECTION
    CSA B137.10-2020 Crosslinked Polyethylene/Aluminum/Crosslinked Polyethylene
    (PEX-AL-PEX) Composite Pressure-Pipe Systems    		 Piping Table 604.1
    CSA B137.
  • CPC § 408.1 Medium relevance — show source text

    1, 408.1, 409.1,
    411.1, 412.1, 420.1| |IAPMO/ANSI Z124.5-
    2013e1 (R2018)|Plastic Toilet Seats|Appurtenance|411.3| |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| |CSA B45.8-2018/IAPMO
    Z403-2018|Terrazzo, Concrete, Composite Stone, and Natural Stone
    Plumbing Fixtures|Fixtures|407.1, 420.1|

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    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,
    1014.3.4
    IAPMO/ANSI Z1002-2020 Rainwater Harvesting Tanks Rainwater Tanks 1603.5
    IAPMO/ANSI Z1033-2015
    (R2020)
    		 Flexible PVC Hoses and Tubing for Pools, Hot Tubs, Spas, and
    Jetted Bathtubs
    		 Tubing 409.6.2
    IAPMO/ANSI Z1088-2019e1 Pre-Pressurized Water Expansion Tanks Miscellaneous 608.3
    IAPMO/ANSI Z1157-
    2014e1 (R2019)    		 Ball Valves Valves 606.1
    ANSI/CAN/IAPMO Z1349-
    2021    		 Devices for Detection, Monitoring or Control of Plumbing
    Systems    		 Leak Detection 606.9
    CSA B125.5-2011/IAPMO
    Z600-2011 (R2016)    		 Flexible Water Connectors with Excess Flow Shut-off Device Miscellaneous 604.5
    ICC ICC ICC ICC
    ICC A117.1-2017 Accessible and Usable Buildings and Facilities Miscellaneous 403.2
    ISEA ISEA ISEA ISEA
    ISEA Z358.1-2014 Emergency Eyewash and Shower Equipment Miscellaneous 416.1, 416.2
    MSS MSS MSS MSS
    MSS SP-58-2018 Pipe Hangers and Supports – Materials, Design, Manufacture,
    Selection, Application, and Installation    		 Miscellaneous 1210.3.5, 1323.4.
  • CPC § 408.3.1 Medium relevance — show source text

    408.3.1 Single Showerhead. [BSC-CG & DSA-SS] Showerheads shall have a maximum flow rate of not more than 1.8 gallons (6.81 L) per minute at 80 psi. Showerheads shall be certified to the performance crite- ria of the U.S. EPA WaterSense Specification for Show- erheads in compliance with Chapter 5, Division 5.3. of the California Green Building Standards Code (CAL- Green).

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    PLUMBING FIXTURES AND FIXTURE FITTINGS

    «

    «

    «

    408.6 Finished Curb or Threshold. Where a shower receptor has a finished dam, curb, or threshold, it shall be not less than 1 inch (25.4 mm) lower than the sides and back of such receptor. In no case, shall a dam or threshold be less than 2 inches (51 mm) or exceeding 9 inches (229 mm) in depth where measured from the top of the dam or threshold to the top of the drain. Each such receptor shall be provided with a nailing flange either integral or field installed in accordance with the manufacturer’s installation instructions. The flange shall be watertight and extend vertically not less than 1 inch (25.4 mm) above the top of the sides of the receptor. The finished floor of the receptor shall slope uniformly from the sides towards the drain not less than [1] ⁄ 8 inch per foot (10.4 mm/m), nor more than [1] ⁄ 2 inch per foot (41.6 mm/m).

    Thresholds shall be of sufficient width to accommodate a minimum 22 inch (559 mm) door. Shower doors shall open so as to maintain not less than a 22 inch (559 mm) unobstructed opening for egress. Where there is a shower without a threshold, the floor space within the same room shall be considered a wet location and shall comply with the requirements of the California Building Code, California Residential Code, and California Electrical Code .

    Exceptions:

    (1) Showers in accordance with Section 403.2.

    (2) A cast-iron shower receptor flange shall be not less than 0.3 of an inch (7.62 mm) in height.

    (3) For flanges not used as a means of securing, the sealing flange shall be not less than 0.3 of an inch (7.62 mm) in height. 408.7 Shower Compartments. Shower compartments shall have a finished interior in accordance with the following: (1) Not less than 1024 square inches (0.6606 m [2] ).

    (2) Be capable of encompassing a 30 inch (762 mm) circle.

    The minimum required area and dimensions shall be measured at a height equal to the top of the threshold and a point tangent to its centerline. The area and dimensions shall be maintained to a point of not less than 70 inches (1778 mm) above the shower drain outlet with no protrusions other than the fixture valve or valves, showerheads, soap dishes, shelves, and safety grab bars, or rails. Fold-down seats in accessible shower stalls shall be permitted to protrude into the 30 inch (762 mm) circle.

    Exceptions:

  • 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

  • CPC § 505.3 Medium relevance — show source text

    Appliances|505.3, 1201.1| |NFPA 37-2024|Standard for the Installation and Use of Stationary Combustion
    Engines and Gas Turbines|Fuel Oil Piping
    Systems|1201.1| |NFPA 51-2023|Standard for the Design and Installation of Oxygen-Fuel Gas
    Systems for Welding, Cutting, and Allied Processes|Fuel Gas|507.9| |NFPA 54/ANSI Z223.1-2024|National Fuel Gas Code|Fuel Gas|Chapter 5, Chapter 12| |NFPA 58-2024|Liquefied Petroleum Gas Code|Fuel Gas|1208.4(8),
    1208.5.6.3,
    1208.5.10.4, 1212.11| |NFPA 70-2023|National Electrical Code
    *See California Electrical Code for amendments|Miscellaneous|508.2.2, 1210.12.5.2,
    1211.2.4, 1211.7,
    1317.1(11), 1323.3.1,
    1326.4(3)|

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    REFERENCED STANDARDS

    TABLE 1701.1 (continued) REFERENCED STANDARDS

    STANDARD NUMBER STANDARD TITLE APPLICATION REFERENCED
    SECTION
    NFPA 88A-2023 Parking Structures Miscellaneous 507.14.1
    NFPA 99-2024 Health Care Facilities Code Miscellaneous 1301.3, 1309.13(2),
    1317.1(9), 1324.5.9.4,
    1326.3, 1326.4(3),
    1326.8(4), 1327.1
    NFPA 211-2024 Standard for Chimneys, Fireplaces, Vents, and Solid Fuel-
    Burning Appliances    		 Fuel Gas,
    Appliances    		 509.5.2, 509.5.3,
    509.5.6.1, 509.5.6.3
    NFPA 409-2022 Standard on Aircraft Hangars Miscellaneous 507.15
    NFPA 780-2023 Standard for the Installation of Lightning Protection Systems Fuel Gas 1211.5
    NFPA 1192-2021 Standard on Recreational Vehicles Fuel Gas 1202.3(18)
    NSF NSF NSF NSF
    NSF/ANSI 3-2021 Commercial Warewashing Equipment Appliances 414.1
    NSF/ANSI 14-2020 Plastics Piping System Components and Related Materials Miscellaneous 301.2.3, 604.1,
    605.9.1, 606.1
    NSF/ANSI 42-2021 Drinking Water Treatment Units – Aesthetic Effects Appliances Table 611.1
    NSF/ANSI 44-2018 Residential Cation Exchange Water Softeners Appliances Table 611.
  • CPC § 301.2.4 Medium relevance — show source text

    Waste, and Vent Piping Applications|Piping, Ferrous|301.2.4, Table 701.2,
    Table 707.2| |CISPI 310-2020|Couplings for Use in Connection with Hubless Cast Iron Soil
    Pipe and Fittings for Sanitary and Storm Drain, Waste, and
    Vent Piping Applications|Joints|301.2.4, 705.2.2| |CSA|CSA|CSA|CSA| |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 A112.19.1-
    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 A112.19.3-
    2017/CSA B45.4-2017|Stainless Steel Plumbing Fixtures|Fixtures|407.1, 408.1, 409.1,
    410.1, 411.1, 415.1,
    420.1| |CSA B45.5-2017/IAPMO
    Z124-2017|Plastic Plumbing Fixtures (with Errata dated August 2017)|Fixtures|407.1, 408.1, 409.1,
    411.1, 412.1, 420.1| |CSA B45.8-2018/IAPMO
    Z403-2018|Terrazzo, Concrete, Composite Stone, and Natural Stone
    Plumbing Fixtures|Fixtures|407.1, 420.1| |ASME A112.3.4-2018/CSA
    B45.9-2018|Macerating Toilet Systems and Waste-Pumping Systems for
    Plumbing Fixtures|Fixtures|710.13| |ASME A112.19.7-
    2020/CSA B45.10-2020|Hydromassage Bathtub Systems|Fixtures|409.1, 409.6.1|

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    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.
  • CPC § 207.0 Medium relevance — show source text

    2025 CALIFORNIA PLUMBING CODE 31

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    DEFINITIONS

    as otherwise provided by statute, to have adequate personnel and expertise to carry out the testing of systems, materials, and construction fixtures or appliances. Area Drain. A receptor designed to collect surface or storm water from an open area. Aspirator. A fitting or device supplied with water or other fluid under positive pressure that passes through an integral orifice or constriction, causing a vacuum. Authority Having Jurisdiction. The organization, office, or individual responsible for enforcing the requirements of a code or standard, or for approving equipment, materials, installations, or procedures. The Authority Having Jurisdiction shall be a federal, state, local, or other regional department or an individual such as a plumbing official, mechanical official, labor department official, health department official, building official, or others having statutory authority. In the absence of statutory authority, the Authority Having Jurisdiction may be some other responsible party. This definition shall include the Authority Having Jurisdiction’s duly authorized representative.

    [HCD 1 & HCD 2] “Authority Having Jurisdiction” shall mean “Enforcing Agency” as defined in Section 207.0 of this code.

    204.0 – B –

    Backflow. The flow of water or other liquids, mixtures, or substances into the distributing pipes of a potable supply of water from sources other than its intended source. See Backpressure Backflow and Backsiphonage. Backflow Connection. An arrangement whereby backflow

    can occur.

    Backflow Preventer. A backflow prevention device, an assembly, or another method to prevent backflow into the potable water system. Backpressure Backflow. Backflow due to an increased pressure above the supply pressure, which may be due to pumps, boilers, gravity, or other sources of pressure. Backsiphonage. The flowing back of used, contaminated, or polluted water from a plumbing fixture or vessel into a water supply pipe due to a pressure less than atmospheric in such pipe. See Backflow. Backwater Valve. A device installed in a drainage system to prevent reverse flow.

    Bathroom. A room equipped with a shower, bathtub, or combination bath/shower.

    Bathroom, Half. A room equipped with only a water closet and lavatory. Bathroom Group. Any combination of fixtures, not to exceed one water closet, two lavatories, either one bathtub or one combination bath/shower, and one shower, and may include a bidet and an emergency floor drain. Battery of Fixtures. A group of two or more similar, adjacent fixtures that discharge into a common horizontal waste or soil branch.

    Bedpan Steamer. A fixture that is used to sterilize bedpans by way of steam.

    Body Spray. A shower device for spraying water onto a bather from other than the overhead position.

    Boiler Blowoff. An outlet on a boiler to permit emptying or discharge of sediment.

  • CPC § 1-15 Medium relevance — show source text

    2025 CALIFORNIA BUILDING CODE 1-15

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

    ADMINISTRATION

    1.10.1.2 Applicable building standards. California Building Standards Code, Title 24, Parts 2, 3, 4, 5, 6, 9, 10 and 11.

    The provisions of Title 24, Part 2, as adopted and amended by OSHPD, shall apply to the applications listed in Section 1.10.1.

    OSHPD 1 adopts the following building standards in Title 24, Part 2:

    Chapters 2 through 10, 12, 14, 15, 16A, 17A, 18A, 19A, 20, 21A, 22A, 23, 24, 25, 26, 30, 31, 32, 33, 35 and Appendix L.

    OSHPD 1R adopts the following building standards in Title 24, Part 2:

    Chapters 2 through 10, 12, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 30, 31, 32, 33 and 35.

    1.10.1.3 Identification of amendments. For applications listed in Section 1.10.1, amendments appear in this code preceded with the acronym [OSHPD 1], unless the entire chapter is applicable. For nonconforming hospital buildings removed from acute-care service, amendments are preceded with the acronym [OSHPD 1R].

    1.10.1.4 Reference to other chapters. Where reference is made within this code to sections in Chapters 16, 17, 18, 19, 21 and 22, the respective sections in Chapters 16A, 17A, 18A, 19A, 21A and 22A shall apply instead for hospital buildings under OSHPD 1.

    Authority— Health and Safety Code Sections 127010, 127015, 1275 and 129850.

    References— Health and Safety Code Sections 19958, 127010, 127015, 129680, 1275 and 129675 through 130070.

    1.10.2 OSHPD 2. Specific scope of application of the agency responsible for enforcement, enforcement agency and the specific authority to adopt and enforce such provisions of this code, unless otherwise stated.

    Application— Skilled nursing facility and intermediate care facility buildings.

    Enforcing agency— Health Care Access and Information/Office of Statewide Hospital Planning and Development (OSHPD). The office shall also enforce the California Energy Commission—Energy Regulations, the Division of the State Architect—Access Compliance regulations and the regulations of the Office of the State Fire Marshal for the above-stated facility type.

    1.10.2.1 Applicable administrative standards. 1. Title 24, Part 1, California Code of Regulations: Chapter 7. 2. Title 24, Part 2, California Code of Regulations: Sections 1.1 and 1.10, Chapter 1, Division I, and as adopted in Chapter 1, Division II.

  • CPC § 11B-57 Medium relevance — show source text

    11B-405 Ramps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-57

    11B-406 Curb Ramps, Blended Transitions and Islands. . . 11B-58

    11B-407 Elevators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-61

    11B-408 Limited-Use/Limited-Application Elevators. . . . . . 11B-66

    11B-409 Private Residence Elevators . . . . . . . . . . . . . . . . . . . . 11B-67

    11B-410 Platform Lifts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-67

    11B-411 Destination-Oriented Elevators . . . . . . . . . . . . . . . . . 11B-68

    xxiv 2025 CALIFORNIA BUILDING CODE

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

    DIVISION 5 – GENERAL SITE AND BUILDING ELEMENTS. . 11B-73

    11B-501 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11B-73

    11B-502 Parking Spaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11B-73

    11B-503 Passenger Drop-Off and Loading Zones . . . . . . . . .11B-76

    11B-504 Stairways . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11B-77

    11B-505 Handrails . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11B-78

    DIVISION 6 – PLUMBING ELEMENTS AND FACILITIES. . . . 11B-81

    11B-601 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11B-81

    11B-602 Drinking Fountains and Bottle-Filling Stations . . .11B-81

    11B-603 Toilet and Bathing Rooms . . . . . . . . . . . . . . . . . . . . . .11B-81

    11B-604 Water Closets and Toilet Compartments. . . . . . . . .11B-82

    11B-605 Urinals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11B-88

  • CPC § 1.1 Medium relevance — show source text

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

    �

    �

    SPECIAL INSPECTIONS AND TESTS

    1703 A .1.1 Independence. An approved agency shall be objective, competent and independent from any other entity providing inspection services and contractor (s) responsible for the work being inspected. The agency shall disclose to the building official and the registered design professional in responsible charge possible conflicts of interest so that objectivity can be confirmed.

    1703 A .1.2 Equipment. An approved agency shall have adequate equipment to perform required tests. The equipment shall be periodically calibrated.

    1703 A .1.3 Personnel. An approved agency shall employ experienced personnel educated in conducting, supervising and evaluating tests and special inspections.

    1703 A .2 Written approval. Any material, appliance, equipment, system or method of construction meeting the requirements of this code shall be approved in writing after satisfactory completion of the required tests and submission of required test reports.

    1703 A .3 Record of approval. For any material, appliance, equipment, system or method of construction that has been approved, a record of such approval, including the conditions and limitations of the approval, shall be kept on file in the building official’s office and shall be available for public review at appropriate times.

    1703 A .4 Performance. Specific information consisting of test reports conducted by an approved agency in accordance with the appropriate referenced standards, or other such information as necessary, shall be provided for the building official to determine that the product, material or assembly meets the applicable code requirements.

    [OSHPD 1 & 4] Tests performed by an independent approved testing agency/laboratory or under the responsible charge of a compe- tent approved independent Registered Design Professional shall be deemed to comply with requirements of this section. Test reports for structural tests shall be reviewed and accepted by an independent California licensed structural engineer.

    1703 A .4.1 Research and investigation. Sufficient technical data shall be submitted to the building official to substantiate the proposed use of any product, material or assembly. If it is determined that the evidence submitted is satisfactory proof of performance for the use intended, the building official shall approve the use of the product, material or assembly subject to the requirements of this code. The costs, reports and investigations required under these provisions shall be paid by the owner or the owner’s authorized agent.

    1703 A .4.2 Research reports. Supporting data, where necessary to assist in the approval of products, materials or assemblies not specifically provided for in this code, shall consist of valid research reports from approved sources.

    1703 A .5 Labeling. Products, materials or assemblies required to be labeled shall be labeled in accordance with the procedures set forth in Sections 1703 A .5.1 through 1703 A .5.4.

    1703 A .5.1 Testing. An approved agency shall test a representative sample of the product, material or assembly being labeled to the relevant standard or standards. The approved agency shall maintain a record of the tests performed. The record shall provide sufficient detail to verify compliance with the test standard.

  • CPC § 304.8 Medium relevance — show source text

    |19
    17
    15
    13|27
    23
    21
    19|52
    45
    40
    37|60
    52
    46
    42|104
    91
    82
    75|122
    106
    95
    87|206
    178
    159
    144|240
    207
    184
    168|409
    355
    319
    234|477
    415
    373
    342|793
    686
    613
    559|936
    812
    728
    665|1660
    1440
    1290
    1180|1860
    1610
    1440
    1320|

    For SI units: 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m [3] /h, 1 pound-force per square inch = 6.8947 kPa, 1 inch water column = 0.249 kPa

    Notes: 1 Table entries are rounded to 3 significant digits. 2 Table includes losses for four 90 degree (1.57 rad) bends and two end fittings. Tubing runs with larger numbers of bends, fittings, or both shall be increased by an equivalent length of tubing to the following equation: L = 1.3 n, where L is additional length (ft) of tubing and n is the number of additional fittings, bends, or both. 3 EHD = Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.

    2025 CALIFORNIA PLUMBING CODE 251

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

    FUEL GAS PIPING

    TABLE 1215.2(16) CORRUGATED STAINLESS STEEL TUBING (CSST) [NFPA 54: TABLE 6.2.1(q)] [1, 2]

  • CPC § 1701.1 Medium relevance — show source text

    TABLE 1701.1 (continued) REFERENCED STANDARDS

    STANDARD NUMBER STANDARD TITLE APPLICATION REFERENCED
    SECTION
    ASTM D3261-2016 Standard Specification for Butt Heat Fusion Polyethylene (PE)
    Plastic Fittings for Polyethylene (PE) Plastic Pipe and Tubing    		 Fittings Table 604.1
    ASTM D4068-2017 Standard Specification for Chlorinated Polyethylene (CPE)
    Sheeting for Concealed Water-Containment Membrane    		 Miscellaneous 408.8.2
    ASTM D4551-2017 Standard Specification for Poly (Vinyl Chloride) (PVC) Plastic
    Flexible Concealed Water-Containment Membrane    		 Miscellaneous 408.8.1
    ASTM D6104-1997
    (R2017)e1    		 Standard Practice for Determining the Performance of
    Oil/Water Separators Subjected to Surface Run-Off    		 Interceptors Table 1009.1
    ASTM E84-2021a Standard Test Method for Surface Burning Characteristics of
    Building Materials    		 Miscellaneous 701.2(2), 903.1(2),
    1101.4
    ASTM E119-2020 Standard Test Methods for Fire Tests of Building Construction
    and Materials    		 Miscellaneous 1404.3, 1405.3
    ASTM E814-2013a (R2017) Standard Test Method for Fire Tests of Penetration Firestop
    Systems    		 Miscellaneous 1404.3, 1405.3
    ASTM F409-2017 Standard Specification for Thermoplastic Accessible and
    Replaceable Plastic Tube and Tubular Fittings    		 Piping, Plastic 404.1
    ASTM F437-2021 Standard Specification for Threaded Chlorinated Poly (Vinyl
    Chloride) (CPVC) Plastic Pipe Fittings, Schedule 80    		 Fittings Table 604.1
    ASTM F438-2017 Standard Specification for Socket-Type Chlorinated Poly
    (Vinyl Chloride) (CPVC) Plastic Pipe Fittings, Schedule 40    		 Fittings Table 604.1
    ASTM F439-2019 Standard Specification for Chlorinated Poly (Vinyl Chloride)
    (CPVC) Plastic Pipe Fittings, Schedule 80    		 Fittings Table 604.1
    ASTM F441/F441M-2020 Standard Specification for Chlorinated Poly (Vinyl Chloride)
    (CPVC) Plastic Pipe, Schedules 40 and 80    		 Piping Table 604.1
    ASTM F442/F442M-2020 Standard Specification for Chlorinated Poly (Vinyl Chloride)
    (CPVC) Plastic Pipe (SDR-PR)    		 Piping Table 604.1, 605.2.2
    ASTM F493-2020 Standard Specification for Solvent Cements for Chlorinated
    Poly (Vinyl Chloride) (CPVC) Plastic Pipe and Fittings    		 Joints 605.2.2, 605.3.1
    ASTM F628-2012e3 Standard Specification for Acrylonitrile-Butadiene-Styrene
    (ABS) Schedule 40 Plastic Drain, Waste, and Vent Pipe with a
    Cellular Core    		 Piping Table 701.2
    ASTM F656-2021 Standard Specification for Primers for Use in Solvent Cement
    Joints of Poly (Vinyl Chloride) (PVC) Plastic Pipe and Fittings    		 Joints 605.2.
  • CPC § 304.8 Medium relevance — show source text

    br>21
    20
    19|48
    46
    44
    42
    40|90
    86
    82
    79
    76|185
    176
    169
    162
    156|277
    264
    253
    243
    234|534
    509
    487
    468
    451|850
    811
    777
    746
    719|1500
    1430
    1370
    1320
    1270|3070
    2930
    2800
    2690
    2590| |1600
    1700
    1800
    1900
    2000|19
    18
    18
    17
    17|39
    38
    37
    36
    35|74
    71
    69
    67
    65|151
    146
    142
    138
    134|226
    219
    212
    206
    200|436
    422
    409
    397
    386|694
    672
    652
    633
    615|1230
    1190
    1150
    1120
    1090|2500
    2420
    2350
    2280
    2220|

    For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 inch water column = 0.249 kPa

    • Table entries are rounded to 3 significant digits.

    262 2025 CALIFORNIA PLUMBING CODE

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

    FUEL GAS PIPING

    |TABLE 1215.2(28) SEMI-RIGID COPPER TUBING [NFPA 54: TABLE 6.3.

Frequently asked questions

Can I rely on the fixture manufacturer’s flow nameplate alone for compliance?

No — nameplate flow is primary evidence, but the installation must meet CPC limits (e.g., 1.8 gpm single‑outlet) and any CALGreen certification requirements referenced in § 408.3. Inspectors may require manufacturer data or certification (WaterSense, ASME/CSA listings) to verify compliance.

Are body sprays treated like showerheads for flow limits?

Yes. The CPC treats body sprays with the same 1.8 gpm at 80 psi limit in the shower consumption rules; multiple‑outlet combined flow rules under § 408.3.2 also apply.

What if I install a hydromassage bathtub?

Hydromassage (whirlpool) tubs are tied to ASME A112.19.7 in the CPC referenced standards table for § 409.1 and § 409.6.1. Use ASME A112.19.7 for system performance and testing. The retrieved CPC snippets did not include full prose of § 409.6.1, so consult the standard and the full CPC text for installation/test requirements.

Is 120°F the maximum everywhere?

The CPC sets 120°F (49°C) as the maximum temperature at bathtub and shower outlets unless specifically permitted/mitigated by the code through listed devices; see § 409.4 and § 408.4.2. Use listed thermostatic/limiting valves per the referenced standards.

Where can I find the exact standards I must meet (ASME/CSA references)?

Table 1701.1 in the CPC lists the referenced standards and maps each standard to the CPC section that requires it (e.g., ASME A112.19.7 → § 409.1 and § 409.6.1). The CPC references table is the authoritative cross‑reference; obtain the listed standard documents for the technical and testing requirements.

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