Appendix S — ONSITE STORMWATER TREATMENT SYSTEMS
1506.0 – 1506.3
California Plumbing Code (Title 24, Part 5) · 2025 edition · updated 2026-09-10 · California
Italicized text is a California amendment to the model code, as printed in the official publication.
System changes . . . . . . . . . . . . . . . . . . . . . . . . .1506.3
Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1501.1.1
OPEN TRENCH WORK . . . . . . . . . . . . . . . . . . . . . . . .314.3
OPENING, EFFECTIVE,
DEFINITION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .207.0
OSHPD 1R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .301.8
OVERFLOWS . . . . . . .404.2, 413.5, 607.5, 1603.9, 1603.9.1
– P –
PATIENT CARE SPACE, DEFINITION . . . . . . . . . . . . .218.0
PENALTIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .106.0
PENETRATION
FIRESTOP SYSTEMS . . . . . . . . . . .218.0, 1404.3, 1405.3
PERCOLATION TESTS . . . . . . . . . . . . . . . .1504.3, H 401.0
PERMITS, REQUIRED . . . . . . . . . . . . .104.1, 502.1, 1501.3,
1601.3, E 101.2, E 302.7,
H 101.9, K 101.3
PERMITS FEES . . . . . . . . . . . . . . . . . . . .104.5, Table 104.5
PIPING
ABS and PVC, residential . . . . . . . .701.2(2)(a), 903.1.1,
1101.4 , 1101.4.2.1
Drainage, changes in direction . . . . . . . . . . . . . . .706.0 Drainage, existing sewers . . . . . . . . . . . . . . . . . . .715.3
Drainage, horizontal slope . . . . . . . . . . . . .708.0, 718.1 Drainage, material . . . .701.2, Table 701.2, 715.1, 720.1 Exposed to sunlight,
ABS and PVC . . . . . . . . . . . . . . . . . . . . . . . . . .906.1
Fuel gas . . . . . . . . . . . . . . . . . . . . . . . . .1208.0, 1210.0 Hangers and supports . . .313.0, Table 313.3, 1210.3.5, 1210.3.5.1, Table 1210.3.5.1,
1323.4 – 1323.4.5
Table 1323.1.4(1) – Table 1323.4.4
Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .601.3
Indirect waste . . . . . . . . . . . . . . . . . . . . . . . . . . . .803.0
Insulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .609.12.3
Joints and connections . . .(see Joints and connections) Location (OSHPD) . . . . . . . . . . . . . . . . . . . . . . . .310.11 Medical gas, material . . . . . . . . . . . . . . . . . . . . . .1318.0 Plumbing vent, material . . . . . . . . . . .Table 701.2, 903.0 Protection of . . . . . . . . . . . . . . . . . . . . . . . .312.0, 718.3,
1210.1.3 – 1210.1.5
Rehabilitation of . . . . . . . . . . . . . . . . . . . . . . . . . .320.0
Separation in trenches . . . . . . . . . . . . . . . . . . .1505.11 Sprinkler system, lawn . . . . . . . . . . Table 610.3, 612.1, Table A 103.1, A 103.2, M 102.5 Storm drainage, materials . . . . . . . . . .1101.4 – 1101.4.6 Trenching, excavation,
and backfill . . . . . . . . . . . . . . . . . . . . . . . . . . . . .314.0
Underground . . . . . . . . . . . . . . . . . . . .314.4.1, 1210.1.6 Water supply, material . . . . . . . . . . . .604.0, Table 604.1 PITS, SEEPAGE . . . . . . . . . . . . . . . . . .221.0, 714.3, 716.1, 722.2 – 722.4, Appendix H PLUGS, CAPS, CLEANOUT . . . . . . . . . . . . . . .707.1, 707.2
PLUMBING
Additions, alterations,
renovations or repairs . . . . . . . . . . . . . . . . . . . .102.4 Appliances . . . . . . . . . . . . . .218.0, 304.1, 310.5, 313.1, 417.2, 603.4.6, 606.5, Table 610.3,
Table 702.1, 801.7, 803.3, 806.1,
807.0, 808.1, Table A 103.1, L 302.2
Appurtenances . . . . . . . . .218.0, 304.1, 313.1, 603.4.6, Table 610.3, Table 702.1, 814.2.1,
1505.9.2, 1505.11, 1506.10.3,
1602.9, Table A 103.1, L 501.2
Connected to sewer or
private disposal systems . . . . . .304.1, 713.1, L 302.2
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218.0
Inspection of . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105.0 Official . . . . . . . . . . .(see Authority Having Jurisdiction) Plumbing equipment schedules . . . . . . . . . . . . . .323.0 System, definition . . . . . . . . . . . . . . . . . . . . . . . . .218.0 Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . .105.3, 105.3.1 Uncovered for inspection . . . . . . . . . . . . . . . . . .105.2.1 Vent, definition . . . . . . . . . . . . . . . . . . . . . . . . . . . .218.0
Vent system, definition . . . . . . . . . . . . . . . . . . . . . .218.0
PLUMBING FIXTURES
Access . . . . . . . . . . . . . . . . . . . . . . . . . . . .402.1, 413.2,
416.4, 422.4
INDEX
Accessibility . . . . . . . . . . . . .403.1, 403.2, 408.6, 408.7
Alternate materials . . . . . . . . . . . . . . . . . . .301.3, 406.3
Approved standards . . . . . . . . . . . .301.2.1, 301.2.2, 408.1,
409.1, 410.1, 411.1, 412.1,
415.1, 416.1, 417.1 – 417.4,
418.1, 420.1
Back-to-back . . . . . . . . . . . . . . . . . . . . . . . . . . . . .704.2
Below curb or sewer level . . . . . . . . . . . . . .710.1, 710.2
Clearance from wall, toilet, urinal . . . . . . . . . . . . .402.5
Connections, drainage . . . . . . . . . .304.1, 406.1, 408.5,
409.2, 415.3, 416.5,
419.2, 420.4, 704.0
Control valves . . . . .408.4, 408.9, 601.2, 606.5 – 606.7,
1303.1, 1505.8, 1506.10
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218.0
Distance from traps . . . . . .1001.2, 1002.2, Table 1002.2
Fixture units . . . . . . . . . . . . . . . . . . .610.3, Table 610.4,
610.7 – 610.10, Table 610.10,
702.0, Table 702.1, Table 702.2,
703.0, Table 703.2, Table A 103.1,
Table C 303.2, Table C 303.3,
C 501.4, C 501.5
Floor drains . . . . . . . . . . . . .408.8, 414.3, 418.0, 704.3,
801.3.2, 1003.1, 1006.0, 1007.1,
1014.3.2, 1016.1, 1017.1, 1101.11,
1505.1, 1506.1, 1602.1, B 101.5,
B 101.6.1, Table C 304.2,
Table C 304.3, E 501.6
Improper location of . . . . . . . . . . . . . . . . . . . . . . .308.0
Indirect wastes . . . . . . . . . . . . . . . . . . . . . . . . . . .804.1
Installation of . . . . . . . . . . . .402.0, 405.3, 408.4, 408.8,
409.3, 409.6, 412.1.1,
413.1 – 413.3, 413.5,
415.4, 416.3, 418.3
Islands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .909.0
Joints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .402.2
Material of . . . . . . . . . . . . . .401.0, 406.2 – 406.4, 408.8
Minimum number . . . . . . . . . . . . . . . . . . . . . . . . .422.0
Must be connected to sewer . . . . . . . . . . . .304.1, 713.1
Must be provided with trap . . . . . . . . . . . . . . . . . .1001.2
Overflows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .404.0
Prohibited . . . . . . . . . . . . . . . . . . . . .310.5, 405.0, 910.7
Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .401.2 Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . .402.5, 402.6
Size of waste for . . . . . . . . . .702.0, Table 702.1, 703.0,
Table 703.2
Special fixtures . . . . . . . . . . . . . . . . . . . . . . . . . . .406.0
Strainers and connections . . . . . . . . . . . . .407.5, 408.5
Supply fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . .402.7
Waste connections . . . . . . . .407.5, 408.5, 409.2, 415.3,
416.5, 419.2, 420.4
Water supply required . . . . . . . . . . . . . . . . . . . . . .601.2
POLLUTION . . . . . . . . . . . .218.0, 603.1, Table 603.2, 714.5
POLYVINYL CHLORIDE (PVC)
PIPE OR TUBING
Approved standards,
water supply and DWV . . . . .Table 604.1, Table 701.2
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218.0
Exposed to sunlight . . . . . . . . . . . . . . . . . . . . . . . .906.1 Flexible tubing for whirlpool bathtubs . . . . . . . . .409.6.2 Joining and connections . . . . . . . . . . . . . . . .(see Joints and connections) Lining for shower receptors . . . . . . . . . . . . . . . . . .408.8
Roof drains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1102.1
POLYETHYLENE (PE) PIPE OR TUBING
Approved standards,
water supply and DWV . . . . . . . . . . . . . .Table 604.1,
Table 701.2
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218.0
Fuel gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1208.5.4, Table 1215.2(19) – Table 1215.2(23), Table 1215.2(34) – Table 1215.2(36) Joining and connections . . . . . . . . . . . . . . . .(see Joints and connections)
Roof drains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1102.1
POLYETHYLENE-ALUMINUM-POLYETHYLENE
(PE-AL-PE) PIPE OR TUBING
Approved standards, water supply . . . . . . . .Table 604.1
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218.0
Joining and connections . . . . . . . . . . . . . . . .(see Joints and connections)
POLYETHYLENE OF RAISED
TEMPERATURE (PE-RT) PIPE OR TUBING
Approved standards, water supply . . . . . . . .Table 604.1
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218.0
Flexible connectors . . . . . . . . . . . . . . . . . . . . . . .604.13
Joining and connections . . . . . . . . . . . . . . . .(see Joints and connections) POLYPROPYLENE (PP) PIPE OR TUBING
Approved standards, water supply . . . . . . . .Table 604.1
Chemical waste . . . . . . . . . . . . . . . . . . . . . . . . . . .811.2
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218.0
Joining and connections . . . . . . . . . . . . . . . .(see Joints and connections)
Roof drains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1102.1
POLYVINYLIDENE FLUORIDE (PVDF)
PIPE OR TUBING
Chemical waste . . . . . . . . . . . . . . . . . . . . . . . . . . .811.2
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218.0
POTABLE RAINWATER
CATCHMENT SYSTEMS . . . . . . . . . . . . . . . .Appendix K
POTABLE WATER
Connections . . . . . . . . . . . . . .603.4.4, 603.5.6, 603.5.7,
603.5.10 – 603.5.12,
603.5.14, 603.5.21,
801.5, 1303.5
574 2025 CALIFORNIA PLUMBING CODE
INDEX
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218.0
Devices or assemblies . . . . . . . . . . . . . . . . . . . . .603.2
Disinfection . . . . . . . . . . . . . . . . . . . . . . . . . . . . .609.10
Protection from
heat transfer medium . . . . . . . . . . . .505.4.1, C 302.2
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . .501.1, L 507.0
Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .601.3
Joints and fittings . . . . . . . . . . . . . . .604.2, 604.6, 605.0
Materials . . . . . . . . . . . . . . . . . . . . . .604.1, Table 604.1
Outlets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .603.5.17
Protection of . . . . . . . . . . . . . . . . . . . . . . . .602.0, 603.0
Sizing piping . . . . . . . . . . . . . . . . . . .610.0, Appendix A, Appendix C, Appendix M Supply required . . . . . . . . . . . . . . . . . . . .601.2, E 302.1
Tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .607.0
Unlawful connection to . . . . . . . .602.0, 603.5.11, 1503.3,
1505.4, 1506.4, 1602.4,
E 502.3, K 102.2
Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .606.0
PRE-RINSE SPRAY VALVES . . . . . . . . . . . . .420.3, L 201.0
PRESSED FITTINGS . . . . . . . . . . . . . . . . .605.1.3, 605.1.3.2,
605.13.1, 605.16.1, 705.7.1
PRESSURE DRAINAGE
CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . .805.0
PRESSURE, EXCESSIVE, WATER . . . . . . . . . . . . . . .608.2
PRESSURE-LOCK-TYPE
CONNECTION, DEFINITION . . . . . . . . . . . . . . . . . .218.0
PRESSURE LOSSES, WATER . . . . . . . . . . . . . . . . . .610.2
PRESSURE REGULATORS
Firefighter breathing air
replenishment systems . . . . . . . . . . . . . . . . . .F 501.8
Fuel gas . . . . . . . . . . . . .507.20, 507.21, 1202.1, 1208.7,
1210.9, 1215.1.3
Medical gas and
medical vacuum . . . . . . . . . . . . . . . . . . . . . .1321.10.2
Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .608.2
PRESSURE-RELIEF VALVES
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .224.0
Differential,
backflow prevention . . . . . . . . . . .603.3.7, Table 603.2
Discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .608.5 Firefighter breathing
air replenishment systems . . . . . . . . . . . . . . .F 501.1,
F 501.8, F 701.3
Medical gas and medical vacuum . . . . .1308.2, 1308.3,
1310.4, 1316.1
Water Heaters . . . . . . . . . . . . . . . . .504.4, 504.6, 505.2
Water Supply . . . . . . . . . . . . . . .608.2 – 608.4, E 302.5
PRIMARY SETTLING TANKS . . . . . . . . . . . . . . . . . . .902.1
PRIVACY COMPARTMENT, DEFINITION . . . . . . . . . . . 218.0
PRIVATE OR PRIVATE USE, DEFINITION . . . . . . . . .218.0
PRIVATE SEWAGE
Capacity of system . . . . . . . . . .H 101.7, H 201.0, H 701.1
Construction . . . . . . . . . . . . . . . . . . . .H 501.3, H 601.9,
H 701.3, H 801.3
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218.0
Design . . . . . . . . . . . . . . . . .H 101.6, H 501.2, H 501.11,
H 901.4, H 901.7
Disposal systems . . . . . . . . . .218.0, 713.2, Appendix H General requirements . . . . . . . . . . . . . . . . . . . . .H 101.2 Inspections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105.0
Location . . . . . . . . . . . . . . .721.0, H 101.8, Table H 101.8
PRIVATE WATER SUPPLY . . . . . . . . .602.2, 602.4, E 302.1
PROHIBITED
Appliances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .310.5 Concealed gas piping . . . . . . . . . . .1210.4.2, 1212.3.1,
1212.5.3, 1323.6
Concealment of defects . . . . . . . . . . . . . . . . . . . . .309.2
Concealment of work
before inspection . . . . . . . . . . . . . . . . . .105.0, 503.2,
1203.0, 1406.1
Connections
Sewer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .714.3
Waste . . . . . . . . . . . . . . . . . .310.3, 404.2, 603.4.4,
805.1, 807.3, 810.1
Water . . . . . . . . . . . . . . . . .602.0, 603.4.4, E 502.3
Copper tubing, use of . . . . . . . . . . .903.2.2, 1208.5.3.3 Damage to drainage system . . . . . .305.1, 312.3, 312.6
Devices . . . . . . . . . . . . . . . . . . . . . . . . . .310.5, 1210.10
Direct drainage . . . . . . . . . . . . . . . . . . . .603.4.4, 805.1,
807.3, 810.1
Discharge . . . . . . . . . . . . . . . .509.1.2, 714.2, 1603.3.2,
K 104.2
Fittings . . . . . . . . . . . . . . . . . . . . . . .310.0, 315.2, 604.2
Fixtures . . . . . . . . . . . . . . . . . . . . . . . . . . . .310.5, 405.0
Food waste disposal,
connection to . . . . . . . . . . . . . . . . . . . . . . . . .1014.1.3
Fuel gas piping . . . . . . . . . . . . . . . .1208.5.3.3, 1210.3.4 Industrial waste disposal . . . . . . . . . . . . . . . . . . . .306.2
Installations . . . . . . . . . . . . . . . . . . . . . . . .312.2, 602.1
Joints and connections . . . . . . .315.2, 605.1.4, 605.6.2,
1321.12.3, 1322.7
Locations . . . . . . . . . . . . . . . . .415.4, 1210.3.4, 1503.6
Materials . . . . . . . . . . . . . . .F 801.4, H 501.10, H 501.13,
K 103.1.1, L 503.1.1
Medical gas and medical vacuum piping . . . . . . . . . . . . . . . . .1323.3.1 Oxygen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1213.1.6 Pipes in concrete or masonry . . . . . . . . . . . . . . . .312.2
Practices . . . . . . . . . . . . . .102.4.1, 104.1, 106.0, 303.1,
305.1, 309.2, 310.0, 312.2,
312.6, 502.1, 602.0, 714.1,
1101.3, 1204.3, 1205.0, 1206.3,
1501.3, K 101.3, L 302.1
Receptors, location of . . . . . . . . . . . . . . . . . . . . . .804.1 Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .310.4
Traps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1004.0
INDEX
Trough type urinals . . . . . . . . . . . . . . . . .405.2, E 501.5
Urinals and water closets on a
combination waste and vent system . . . . . . . . .910.7
Vent termination . . . . . . . . . . . . . . . . . . . . . . . . . .906.3
Water piping . . . . . . . . . . . . . . . . . .312.6, 604.2, 720.1 PROPERTY LINE, TERMINATION OF VENT . . . . . . .906.2
PROTECTION FROM
Corrosion . . . . . . . . . . . . .312.1, 312.4, 402.3, 402.6.2,
402.6.3, 506.9, 507.5, 508.1.2,
509.5.3, 509.7, 509.10.1,
509.10.1.2, 509.10.1.3, 603.5.14.1,
603.5.14.2, 609.3, 710.4,
710.8, 810.2, 811.2, 814.1,
1004.1, 1208.5.3.4, 1208.6.1.1,
1210.1.3, 1210.3, 1210.4.5, 1310.4,
1323.2, 1323.3, 1503.9.1, C 501.3,
E 301.3.2, E 403.5, E 403.6,
E 403.8.2, E 403.8.4, E 502.7,
F 501.4, H 501.3, H 501.13,
K 105.2, K 106.2.2
Decay . . . . . . . . . . . . . . . . . .1503.9.1, H 501.3, K 105.2 Freezing . . . . . . . . . . . . . . . . . .312.6, 603.4.7, 1210.1.4,
1210.7.1, 1603.16
Seismic . . . . . . . . . . . . . . . . . . . . . . . . .507.2, 1323.4.5
PROTECTION OF
Animals and insects . . . . . . . . . . . . . . . . . . . . .1503.9.3
Fuel gas meters . . . . . . . . . . . . . . . .1208.6.1, 1208.6.3 Piping materials and structures . . . . . . . . . . . . . .312.0,
314.4, 1210.1
Potable water supply . . . . . . . . . . . . . . . . . . . . . . .603.0 Trap seals . . . . . . . . . . . . . . . . . .1002.0, 1005.1, 1007.0
Water heaters . . . . . . . . . . . . . . . . . . . . .504.3 – 504.6,
505.2, 507.2,
507.12 – 507.15
PSYCHIATRIC SERVICES . . . . . . . . . . . . . . . . . . . . . .322.0
PUBLIC OR PUBLIC USE, DEFINITION . . . . . . . . . . .218.0
PUBLIC SEWER, DEFINITION . . . . . . . . . . . . . . . . . .218.0
PUBLIC SHOWER FLOORS . . . . . . . . . . . . . . . . . . . .408.8
PUSH FIT FITTINGS . . . . . . . . . . . . . . . . . . .218.0, 605.1.3,
605.1.3.3, 605.2.1
– Q –
QUALITY AND WEIGHT OF MATERIALS,
GENERAL REGULATIONS . . . . . . . . . . .301.2.1, 301.2.2,
301.3, 301.5
QUALITY OF FIXTURES . . . . . . . . . . . . . . . . . . . . . . .401.2
QUICK-DISCONNECT DEVICE, DEFINITION . . . . . .219.0
– R –
RAINWATER
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220.0
Disinfection . . . . . . . . . . . . . . . . . . . . . . . . . . . .1603.4.1
RAINWATER CATCHMENT
SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . .220.0, 601.3.3,
Chapter 16, Appendix K
RAINWATER DIVERSION
VALVES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1603.20
RAINWATER STORAGE TANK,
DEFINITION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .220.0
REAMING PIPES . . . . . . . . . . . . . .309.3, 605.1.1 – 605.1.2,
605.1.3.2, 605.1.3.3,
605.1.4, 609.1,
701.3.1, 705.3.1,
705.3.3, 903.3
RECEIVING LANDSCAPE, DEFINITION . . . . . . . . . . . 220.0
RECEIVING TANKS OR SUMPS . . . . . . . . . . .710.2, 710.3,
710.7 – 710.10,
710.13.1
RECEPTORS
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .220.0
Indirect waste . . . . . . . . . . . . . . . . . . . . . . .414.3, 801.2,
801.3.2, 801.3.3,
801.5, 801.6, 801.7,
804.0, 807.1,
810.4, 814.5,
902.2, 1303.4.1
Shower . . . . . . . . . . . . . . . . . . . . .408.1, 408.5 – 408.8
RECLAIMED (RECYCLED)
WATER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .220.0,
601.3.3, 1505.0
RECYCLED WATER SUPPLY SYSTEMS . . . . . . . . . . . 1505.0
Allowed . . . . . . . . . . . . . . . . . . . . . . .1505.1.1, 1505.1.2
Color and marking . . . . . . . . . . . . . . . . . . . . . . . . 1505.8
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220.0
In buildings . . . . . . . . . . . . . . . . . . . . . . . 1505.0, 1505.1
Inspection & testing . . . . . . . . . . . . . . . . . . . . . .1505.14
Maintenance and inspection . . .1505.16, Table 1505.16
Minimum water quality requirements . . . . . . . .1505.14
Signage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1505.12
Structures allowed for toilet and
urinal flushing . . . . . . . . . . . . . . . . . . . . . . . . 1505.1.2
REDUCED PRESSURE DETECTOR FIRE
PROTECTION BACKFLOW
ASSEMBLY . . . . . . . . . . . .Table 603.2, 603.3.9, 603.5.14
REDUCERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .316.0
REFRIGERATORS . . . . . . . . . . . . . . . . . . . . . . . . . . . .801.3
REGULATORS
Backpressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . .507.9
Draft . . . . . . . . . . . . . . . . . .506.1.2, 509.12.3 – 509.12.5,
509.15
Firefighter breathing air . . . . . . . . . . . . . . . . . . . .F 501.8
Fuel gas supply . . . . . . . . . . . .507.20 – 507.22, 1202.1,
1208.2, 1208.7 – 1208.11,
1213.1.5, 1214.1, 1215.1.3,
E 404.0, E 404.4, E 404.5.2
Medical gas and medical vacuum . . .1308.3, 1321.10.2
Water supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . .608.2
576 2025 CALIFORNIA PLUMBING CODE
INDEX
RELIEF VENTS . . . . . . . . . . . . . . . . . . .907.0, 911.3, B 101.4
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . .805.1
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .220.0
Interceptors . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1009.4 REMOTE OUTLET, DEFINITION . . . . . . . . . . . . . . . . .220.0
RENDERERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .601.7
REPAIRING
Defective gas pipe, prohibited . . . . . . . . . . . . .1208.5.7
REPAIRS AND ALTERATIONS TO
PLUMBING AND DRAINAGE SYSTEMS . . . . . . . .102.4
REQUIRED
Air gaps or air breaks . . . . . . . . . . . . . . . . . . . . . . .801.2 Appurtenances . . . . . . . . . . . . . . . .1505.11, 1506.10.3,
1602.9
Area of subsurface irrigation
fields and mulch basins . . . . . . . . . . . . . . . . . .1504.2
Drainage or sewer connections . . . . . . . . .304.1, 713.0
Filters . . . . . . . . . . . . . . . . . . . . . . . .1506.10.5, 1603.18
Flushing devices . . . . . . . . . . . . . . . . . . . . . . . . . .413.1 Fuel gas pipe size . . . . . . . . . . . . . . . . . . . . . . . .1215.0 Fuel gas supply . . . . . . . . . . . . . . . . . . . . . . . . . .1214.0 Gravity drainage . . . . . . . . . . . . . . . . . . . . . . . . . .709.0
Hot and cold water . . . . . . . . . . . . . . . . . . . . . . .601.2.1
Inspections . . . . . . . . . . . . . . . . . . . . .1406.0, 1502.3.4,
1605.3.4
Low-pressure cutoff . . . . . . . . . . . . . . . . . . . . . . . .609.9 Medical gas and medical vacuum pipe size . . . . . . . . . . . . . . . .1323.1
Permits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .104.0
Plans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .103.3
Plumbing fixtures . . . . . . . . . . . . . . .422.0, Table 422.1
Tests . . . . . . . . . . . . . . . . .1502.2 – 1502.3.4, 1504.10,
1505.6, 1506.6, 1602.5
Vents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .901.2
RESPONSIBLE FOR TESTING . . . . . . . . . . . . . . . .105.2.5
RESTAURANT, GREASE INTERCEPTORS . . . . . . .1014.1
RETESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105.3.2
RISERS
Fuel gas . . . . . . . . . . . . . . .1208.5.6, 1210.1.7, 1210.4.4,
E 403.6, E 404.3
Medical gas and
medical vacuum . . . . . . . . . . . . . . .1323.3, 1323.13.3
Sewer . . . . . . . . . . . . . . . . . . . . . . . .E 504.6, E 504.6.2
Water . . . . . . . . . . . . . . . . . . . . . .220.0, 408.11, 610.1,
1502.3.3, A 103.1, A 106.1,
A 106.2, A 108.1, E 302.1,
E 302.4, E 503.2,
E 505.4, L 503.3.7
RODENTPROOFING . . . . . . . . . . . . . . . . .312.12, 1503.9.3
ROOF DRAINS . . . . . . . . . . . . . .220.0, 1101.12.1, 1101.12.2,
1101.15, 1102.0, Table 1103.1,
1106.3, 1107.2.1, K 105.12
ROOF DRAINAGE . . . . . . . . . . . . . . . .1101.12, Appendix D
Combined . . . . . . . . . . . . . . . . . . . . . . . . .1101.12.2.2.2
Controlled-flow . . . . . . . . . . . . . . . . . . . . . . . . . . .1105.0
Primary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1101.12.1 Secondary . . . . . . . . . . . . . . . . . . . . . . . . . . . .1101.12.2 Separate piping . . . . . . . . . . . . . . . . . . . . .1101.12.2.2.1 ROOF GUTTERS . . . . . . . . . . . . . . . . . . . .1101.12.1, 1103.3,
Table 1103.3, 1602.6, 1602.7.2,
1603.14, 1603.19, K 103.2,
K 105.12, K 106.3
ROOF, TERMINATION OF
VENTS ABOVE . . . . . . . . . . . . . . .509.6.1, 905.4, 906.1,
906.3, 906.5, 906.7
ROOF WASHERS . . . . . . . . . . . . . . . . . . . . .220.0, K 106.2
ROUGHING-IN, DEFINITION . . . . . . . . . . . . . . . . . . . .220.0
– S –
SADDLE, SLEEVE, BAND OUTLETS,
PROHIBITED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .310.1
SAFETY AND HEALTH . . . . . . . . . . . . . . . . . . . . . . . .102.5
SAFETY DEVICES . . . . . . . . . .504.4 – 504.6, 505.2, 608.0
SAND INTERCEPTORS . . . . . . . . . . . . . . . . . . . . . . .1016.0
Cleanout for . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .707.7
Construction and size . . . . . . . . . . . . . . . . . . . . .1016.3
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .221.0
Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1009.3 Discharge . . . . . . . . . . . . . . . . . . . . . . . . .1009.7, 1016.1
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1009.5
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . .1009.6
Required . . . . . . . . . . . . . . . . . . . . . . . . .1009.1, 1016.1
Vent, required and
not required . . . . . . . . . . . . . . .902.1, 1002.1, 1016.4
Water seals . . . . . . . . . . . . . . . . . . . . . . .1009.3, 1016.4
SANITARY TEES,
PERMISSIBLE USE . . . . . . . . . . . . . . . . .706.2, C 601.3,
C 601.4
SCREW JOINTS . . . . . . . . . . . . . . . . . . . . . .1205.2, 1206.3
SCRUB SINK, DEFINITION . . . . . . . . . . . . . . . . . . . . . . 221.0
SDR, DEFINITION . . . . . . . . . . . . . . . . . . . . . . . . . . . .221.0
SEAL, TRAP . . . . . . . . . . . . . . . . .222.0, 315.1, 412.1.1, 413.4,
901.3, 912.2, 1005.0,
1007.0, E 501.6
SEAM, WELDED, DEFINITION . . . . . . . . . . . . . . . . . .221.0
SECONDARY INTERCEPTORS . . . . . . . . . . . . . . . . .902.1
SECONDARY TEMPERATURE
LIMITING DEVICE . . . . . . . . . . . . . . . . . . . . . . . . . .505.2
SEDIMENT TRAPS . . . . . . . . . . . . . . . . . . .1210.7.2, 1212.9
SEEPAGE PITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . .H 701.0
Abandoned . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .722.2
Area of disposal . . . . . . . . . . . . . . . . . . . . . . . . .H 301.0 Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .H 701.1 Combination with disposal fields . . . . . . . . . . . .H 601.4 Connection to sewer prohibited . . . . . . . . . . . . . . .714.3
Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . .H 701.3
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .221.0
INDEX
Location . . . . . . . . . . . . . . .721.0, H 101.8, Table H 101.8
Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .716.1 Multiple installations . . . . . . . . . . . . . . . . . . . . . .H 701.2 Soil absorption . . . . . . . . . . . .Table H 201.1(2), H 301.1
SELF-CLEANING TRAPS . . . . . . . . . . . . . . . . . . . . .1003.1
SEPARATE PLUMBING AND
DRAINAGE SYSTEMS . . . . . . . . . . . . . . . . . . . . . . .311.0
SEPARATE VENTING . . . . . . . . . . . . . . . . . . . .811.6, 906.3
SEPARATORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1009.0
SEPTIC TANKS
Abandoned . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .722.2
Capacity . . . . . . . . . . . . . . . . . .H 201.0, Table H 201.1(1)
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . .H 601.7
Connections to sewer prohibited . . . . . . . . . . . . . .714.3
Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . .H 501.0
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .221.0
Location of . . . . . . . . . . . . . . . . . .H 101.8, Table H 101.8
Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .716.1
Vents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .H 501.8
SERVICE, AUTHORITY TO RENDER GAS . . . . . . . .1205.0
SERVICES/SYSTEMS AND UTILITIES . . . . . . . . . . . . .310.14
SETTING FIXTURES . . . . . . . . . . . . . . . . . . . . . . . . . .402.5
SETTLING TANKS . . . . . . . . . . . . . . . . . . . . . . . . . . . .902.1
SEWAGE
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .221.0
Disposal of . . . . . . . . . . . . . .303.0, 709.0, 713.0, 714.0,
1014.1, 1010.5.2, 1503.2, E 301.1,
E 504.1, L 302.1
SEWAGE DISPOSAL
SYSTEMS, PRIVATE . . . . . . . . . . . . . . 1010.5.2, Appendix H
Abandoned . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .722.2
Commercial food waste grinders . . . . . . . . . . . . . .714.4 Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .H 101.6 Holding tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . .714.5 Inspection and testing . . . . . . . . . . . . . . . . . . . .H 1001.0
Location . . . . . . . . . . . . . . . . . . . . . . . . . . .307.0, 721.0,
H 101.8, Table H 101.8
Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .715.0
Vents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .904.1
SEWAGE EJECTOR . . . . . . . . .221.0, 710.2, 710.3, 710.10
SEWAGE PUMP . . . . . . . . . . . . .221.0, 710.2, 710.3, 710.13
SEWERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Chapter 7
Abandoned . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .722.0
Adjacent to walls . . . . .312.3, 715.1, 718.3, Table 721.1
Available . . . . . . . . . . . . . . . . . . . . . . . . . . .713.2, 713.4
Building, definition . . . . . . . . . . . . . . . . . . . . . . . . .204.0 Building, material of . . . . . . . . .701.0, Table 701.2, 715.0
Cleanouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .719.0
Connection to, required . . . . . . . . . . . . . . .304.0, 713.0
Construction of . . . . . . . . . . . . . . . . . . . . .715.0 – 719.0
Damage to . . . . . . . . . . . . . . . . . . . . .305.1, 306.1, 714.1,
718.3, 811.1, 1009.1
Depth of . . . . . . . . . . . . . . . . . . . . . .312.3, 718.3, 720.1
Easements for . . . . . . . . . . . . . . . . . . . . . . . . . . . .721.2
Ejectors . . . . . . . . . . . . . . . . . . . . .710.2, 710.3, 710.10 Existing . . . . . . . . . . . . . . . . . . . . .102.4.1, 713.6, 715.3 Grade and support of . . . . . . . . . . . . . . . . .708.0, 718.0 Gray water . . . . . . . . . . . . . . . . . . . . .1503.0 – 1503.9.7 Independent system required . . . . . . . . . . . . . . . . .311.0 Inspections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105.0
Joints and connections . . . . . . . . . . . . . . . . . . . . .705.0
Location . . . . . . . . . . . . . . . . . . . . . .307.0, 312.3, 718.3,
720.0, 721.0, Table 721.1
Materials . . . . . . . . . . . . . . . . . . . . . .701.0, Table 701.2,
715.0, 720.1
Mobile home and
recreational vehicle parks . . . . . . . . .E 301.0, E 504.0 Must be on same lot as building . . . . . . . . .307.1, 721.1 Private sewage disposal systems . . . . . . . .713.0, 714.0
Prohibited connections . . . . . . . . . . . . . . .603.4.4, 714.2,
714.3, E 502.7
Reclaimed (recycled) water . . . . . . . . . . . . . . . .1505.12 Required . . . . . . . . . . . . . . . . . . . . . . . . . . .709.1, 713.0 Size of building . . . . . . . . . . . . . . . .Table 702.1, 703.2,
Table 703.2, 710.5,
717.0, Table 717.1, C 304.2,
Table C 304.2, C 601.9
Storm water . . . . . . . . . . . . . . . . . . . . .1101.3, 1101.16.2
Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .718.2 Testing of . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .723.0
Vents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .904.1
Water pipe in trench . . . . . . . . . . . . . . . . . .609.2, 720.0 SHALL, DEFINITION . . . . . . . . . . . . . . . . . . . . . . . . . .221.0
SHEET LEAD . . . . . . . . . . . . . . . . . . . . . . . .408.8, 408.8.3,
701.5, 906.6
SHIELDED COUPLINGS . . . . . .221.0, Table 313.3, 705.2.2
SHOCK ARRESTER, DEFINITION . . . . . . . . . . . . . . .221.0
SHORT TURN [1] ⁄ 4 BEND, PROHIBITED . . . . . .310.5, 706.0
SHOULD, DEFINITION . . . . . . . . . . . . . . . . . . . . . . . . .221.0
SHOWERS
Approved standards . . . . . . . . . . . . . . . . . . . . . . .408.1
Control valves . . . . . . . . . . . . . . . . . . . . . . .408.4, 601.2
Discharge, gray water . . . . . . . . . . . . . . . . . .1503.8.2.2
Finished curb or threshold . . . . . . . . . . . . . . . . . . .408.6
Gang . . . . . . . . . . . . . . . . . . . .209.0, 408.4.1, 408.4.2,
L 201.0, L 402.6.1
Mobile home and recreational
vehicle parks . . . . . . . . . . . . . . . . . . . . . . . . . .E 501.7
Multiple showerheads serving
one shower . . . . . . . . . . . . . . . . . . . . . . . . . . .408.3.2
Pans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .408.8
Public floors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .408.9
Receptors . . . . . . . . . . . . . . . . . . . . .408.6, 408.7, 408.8 Single showerhead . . . . . . . . . . . . . . . . . . . . . .408.3.1 Stall or compartment . . . . . . . . . . . . . . . . . . . . . . .408.7
Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .408.8.5
578 2025 CALIFORNIA PLUMBING CODE
INDEX
Valve and head location . . . . . . . . . . . . . . . . . . .408.10
Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . .417.2, 417.3
Waste outlet or drains . . . . . . . . . . . . . . . . .317.1, 408.5
Water consumption . . . . . . . . . . . . . . . . .408.3, L 402.6
SHUTOFF VALVES
Fuel gas . . . . . . . . . . . . . . . . .507.8, 509.5.7.1, 1208.12,
1210.3.3.1, 1210.8.2, 1210.11,
1212.3.1, 1212.3.2, 1212.5.3,
1212.6, 1212.7, 1212.9,
1213.2.5, 1213.6.1.4, E 402.3,
E 402.4.2, E 403.0, E 403.9,
E 403.13, E 404.5
Medical gas and
medical vacuum . . . . . . . . . . . . . . .1310.3.2, 1312.2,
1314.6, 1314.7, 1314.8,
1314.11, 1327.2
Sewage. . . . . . . . . . . . . . . . . . . . . . . 710.12.1, 710.13.2
Water . . . . . . . . . . . . . . . . . . . . . . .504.6, 606.2, 606.3,
608.4, 609.9, E 302.3,
L 402.3.1, L 404.6,
L 410.3, L 413.4
SIGNAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . 1501.9, 1505.13
Access door . . . . . . . . . . . . . . . . . . . . . . . . . . .1505.9.2
Commercial, industrial, institutional,
and residential . . . . . . . . . 1501.9. 1, 1505.13.1, 1604.2
Equipment room . . . . . . . . . 1501.9. 2, 1505.13.3, 1604.3 Tank type toilet . . . . . . . . . . . . . . . . . . . . . . . .1505.13.2
SIMPLE SYSTEM
Clothes washer . . . . . . . . . . . . . . . . . . . . . . . . .1503.1.2
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221.0
SINGLE-STACK VENT SYSTEMS . . . . . . . . . . . . . .C 601.0
SINKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .420.0
Approved standards . . . . . . . . . . . . . . . . . . . . . . .420.1 Clinical . . . . . . . . . . . . . . . . . . . . . .205.0, 413.1, 1303.7
Floor . . . . . . . . . . . . . . . . . . . . . . . . . . . . .421.0, B 101.2
Island . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .909.1
Laundry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .420.4 Prohibited types . . . . . . . . . . . . . . . . . . . .405.3, B 101.2
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .420.4
Special use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .406.2 Three-compartment . . . . . . . . . . . . . . . . . . . . . . .1001.2
SIZE OF
Building sewers . . . . . . . . . . . .703.2, 717.0, Table 717.1 Cesspools . . . . . . . . . . . . . . . . . . . . . . . . . .Appendix H Chimneys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .509.5.5 Circuit venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . .911.0
Combination waste
and vent piping . . . . . . . . . . . . . . . . .910.0, Appendix B Combustion air openings . . . . . . . . . . . . .506.3 – 506.5 Condensate pipe . . . . . . . . . . . . . . . .814.3, Table 814.3 Disposal fields . . . . . . . . . . . . . . . . . . . . . . .Appendix H Drainage piping . . . . . . . . . . . . . . . .Table 702.1, 703.0, Table 703.2, C 304.0,
E 302.2, E 504.4
FOG disposal systems . . . . . . . . . . . . . . . . . . . . .1015.3
Fuel gas piping systems . . . . . .1208.3, 1214.0, 1215.0,
E 403.2, Table E 403.2
Fuel gas vents . . . . . . . . . . . . . . . . . . .509.6.2, 509.7.4,
509.10.2, 510.0
Flushometer valves and tanks . . . . . . . . .610.10, 610.11
Gray water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1503.8
Grease interceptors . . . . . . . . .1014.2.1, Table 1014.2.1,
1014.3.6, Table 1014.3.6
Hanger rods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .313.6
Indirect waste pipes . . . . . . . . . . . . . . . . .801.3.1, 803.3
Leaders, conductors,
and storm drains . . . . . . . . . . .1103.0, Table 1103.1,
Table 1103.2, Table 1103.3
Louvers, grilles, and screens . . . . . . . . . . . . . . . . .506.8
Medical gas and medical vacuum pipe . . . . . . .1323.1.1
Mulch basins . . . . . . . . . . . . . . . . . . . . . . . . . .1504.5.1
Oil tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E 403.12
Pipe cleanouts . . . . . . . . . . . . . . . . .Table 707.1, 707.10
Rainwater catchment systems . . . . . . . .1602.6, K 106.5
Reclaimed (recycled)
water piping . . . . . . . . . . . . . . . . . . . . . . . . . . .1502.6
Roof drainage . . . . . . . . . . . . . . . .1101.12, Table 1103.2,
Table 1103.3, 1105.1,
1603.15, Appendix D, K 106.4
Sand interceptors . . . . . . . . . . . . . . . . . . . . . . . . .1016.3
Seepage pits and disposal fields . . . . . . . . . . . .H 301.0
Septic tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . .H 201.0
Single-stack vent systems . . . . . . . . . . . . . . . . .C 601.0
Subsoil irrigation field piping . . . . . . . . . . . . . . . .1504.7
Traps . . . . . . . . . . . . . . . . . . .702.1, Table 702.1, 910.4,
1003.3, 1006.1, 1101.15.2
Vacuum drainage systems . . . . . . . . . . . . . . . .C 501.2.1
Vent pipes . . . . . . . . . . . . . .Table 703.2, 710.10, 810.1,
Table 810.1, 904.0, 908.1.1,
908.1.2, 908.2.2, C 401.0
Water heaters . . . . . . . . . . . . . . . . .501.1, Table 501.1(1)
Water piping . . . . . . . . .610.0, Table 610.3, Table 610.4,
Table A 103.1, Appendix A,
Appendix C, E 302.2, Appendix M
Water softener connections . . . . . . . . . . . . . . . . . .611.4
Wet venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .908.0
SLAUGHTERHOUSES . . . . . . . . . . . . . . . . . . . . . . . .1010.0
SLIP JOINTS . . . . . . . . . . . . . . . . . . . . . . . . .221.0, 402.10,
509.10.10, 605.14,
705.9.1, 705.9.3, 1003.2
SLOPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .(see Grade)
SOIL PIPE . . . . . . . . . . . . . . . .221.0, 310.2, 310.4, 402.6.1,
Table 701.2, 701.2(6),
722.2, 1002.4
SOIL POROSITY . . . . . . . . . . . . . . . . . . . . . . . . . . . .H 101.2
INDEX
SOLDER, BUSHINGS . . . . . . . . . . . . . . . .701.7, Table 701.7
SOLDER JOINTS . . . . . . .212.0, 309.2, Table 313.3, 402.6,
605.1.3.1, 605.1.4, 605.16.1,
705.3.3, 705.10.1, 705.10.2
SPACING
Pipe supports . . . . . . . . . . . .313.0, Table 313.3, 1210.3.5,
1210.3.5.1, Table 1210.3.5.1,
1323.4, Table 1323.4.4,
1327.6, Table 1327.6
Subsoil irrigation fields . . . . . . . . . . . . . . . . . . .1504.7.3 Trenching and leaching beds . . . . . . . . . . . . . . .H 601.9
SPECIAL FIXTURES . . . . . . . . . . . . . . . . . . . . . . . . . .406.0
SPECIAL VENTING . . . . . . . . . . . . . . . . . . . . . . . . . . .909.0
SPECIAL WASTE PIPE . . . . . . . . . .(see Industrial wastes)
SPECIAL WASTES
Acid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .811.2
Chemical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .811.0
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .221.0
Industrial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .811.0
High temperatures . . . . . . . . . . . . . . .810.1, Table 810.1 Laundries, slaughterhouses, bottling establishments,
and auto wash racks . . . . . . . .711.0, 1010.0 – 1013.0
SPECIFIC GRAVITY,
NATURAL GAS . . . . . . . . . . . . . . . . . . . . . . . . . . .1214.1
SPECIFICATIONS
FOR MATERIALS . . . . . . . . . . . . . . . . . .301.2, Table 1701.1
STACKS . . . . . . . . . . . . . .221.0, 317.1, 706.2, 711.1, 906.1,
907.0, 911.3, 1101.16.2, C 304.3,
C 304.4, C 401.0, C 601.0
STAINLESS STEEL PIPE . . . . . . .Table 313.3, Table 604.1,
605.13, Table 701.2, 705.7
STANDPIPE,
CLOTHES WASHER . . . . . . . . . . . . . . . . . . . . . . . . .804.1
STATION INLETS
AND OUTLETS . . . . . . . . .221.0, 1305.3, Table 1305.3,
1315.0, 1323.1.2,
Table 1323.1.5(1)
STEAM EXHAUST CONDENSER
OR BLOW OFF . . . . . . . . . . . . . . . . . . .810.0, Table 810.1
STERILE EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . .806.0
STORAGE TANKS
Alternate water sources . . . . . . .1503.3, 1505.4, 1506.4
Hot water . . . . . . . . . . . . . . . . . . . . .505.2, 608.6, 608.7,
L 502.2, L 503.3.2, L 503.3.7
Potable water . . . . . . . . . . . . . . . . . . . . . . . . . . .E 502.7
Rainwater . . . . . . . . . . . . . . . . . . . . . .1602.7.3, 1603.0,
K 102.2, K 103.3, K 105.0
Vacuum drainage . . . . . . . . . . . . . . . . . . . . . .C 501.2.1 STORM DRAINAGE SYSTEMS . . . . .Chapter 11, Appendix D
STORM DRAINS . . . . . . . . . .221.0, 1101.4.4, 1101.6, 1101.11,
1101.12, 1101.13, 1101.15,
1103.0, 1104.1
STORM SEWERS . . . . . . . . . .221.0, 715.3, 1101.2, 1101.4.5,
1101.12.2.2.2, 1101.13.1,
1103.2, 1104.1
STRAINERS
AND CONNECTIONS . . . . . . . . . . . . . . . . . .407.5, 408.5,
810.4, 1012.1, 1102.2
S-TRAP PROHIBITED . . . . . . . . . . . . . . . . . . . . . . . .1004.1
STREET MAIN;
(SEE WATER MAIN) . . . . . . . . . .225.0, 608.1, 608.3, 610.7,
Table 721.1, Table 1503.4, A 104.2,
A 104.4, Table H 101.8
STRUCTURAL
CONDITION SAFETY . . . . . . . . . . . . . . . . .312.2, 312.11
SUBMETER
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221.0
Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . .601.2.1
SUBMITTAL OF PLANS . . . . .103.3, 104.3, 104.3.2, 104.3.3,
301.5.3, 811.1, 910.2,
1105.1, 1304.3, 1505.2.1,
1602.2, C 301.1, C 501.1,
E 101.2, H 501.1, K 101.3.1
SUBSOIL DRAINS . . . . . . . .221.0, 1101.4.6, Table 1101.4.6,
1101.6, 1101.8, 1101.9
SUBSOIL
IRRIGATION FIELDS . . . . . .221.0, 1503.2.1, Table 1503.4,
1504.2, 1504.5, Table 1504.5.3
SUBSTITUTE MATERIALS . . . . . . . . . . . . . . . . . . . . .301.3
SUBSURFACE
DISPOSAL FIELDS
Absorption capacity . . . . . . . . . . . . . . . . . . . . . . .1504.3
Construction . . . . . . . . . . . . . . . . . . . .1504.5, 1504.5.3
Prohibited . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1504.4
Required area . . . . . . . . . . . . . . . . . . . . . . . . . . .1504.2
Sewage disposal . . . . . . . . . . . . . . . . . . . . . . . .H 101.2 System Requirements . . . . . . . . . . . .1503.2, 1503.2.1,
Table 1503.4
Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1504.1
SUBSURFACE
IRRIGATION FIELDS . . . . . . . . . . . . . . . .221.0, 1503.2.1,
1504.2 – 1504.4, 1504.5,
1504.5.2
SUDS RELIEF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .711.0
SUMPS
Boiler room, installation . . . . . . . . . . . . . . .810.1, 810.3
Building, backwater
devices . . . . . . . . . . . . . . .710.1, 710.3, 710.4, 710.6
Building drainage
systems below sewer level . . . . . . . . . . . . . . . . . . .710.2
Condensers . . . . . . . . . . . . . . . . . . . .810.0, Table 810.1
Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . .810.2
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .221.0
Macerating toilet systems . . . . . . . . . . . . . . . . .710.13.1
580 2025 CALIFORNIA PLUMBING CODE
INDEX
Pump connection permitted . . . . .710.2 – 710.5, 710.9,
805.1, 1101.6.2, 1101.7
Pump discharges, conversion
to fixture units . . . . . . . . . . . . . . . . . . . . .702.3, 710.5
Sewage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .710.2
Sizing, sewage
ejector and pumps . . . . . . . . . . . . . . . . . . . . . . .710.3
Storm drainage . . . . . . . . . . . .1101.6.2, 1101.6.3, 1101.7,
1101.10, 1101.11, 1101.14
Vents . . . . . . . . . . . . . . . . . . . . .710.7, 710.10, 710.13.3,
810.1, Table 810.1
Water supply inlets . . . . . . . . . . . . . . . . . . . . . . .603.5.5
SUPPLY, WATER
Fittings, fixtures . . . . . . . . . . . . . . . . . . . . . . . . . . .402.7
Fixture, definition . . . . . . . . . . . . . . . . . . . . . . . . . .208.0
Fixture units . . . . . . . . . . . . . . . . . . .610.3, Table 610.3,
610.7 – 610.10, Table 610.10,
Table A 103.1, C 303.2,
C 501.5, E 302.1, E 302.2,
E 302.2.2, L 402.3.1
Hot water . . . . . . . . . . . . . . . . . .601.2.1, 602.1, 603.4.5,
603.5.10, 608.7, 609.1,
609.4, 610.3, Table 610.3,
610.12.1, 610.12.2,
Table A 103.1, A 105.3,
Table C 303.2, L 502.5,
L 502.7, L 502.7.3
Materials . . . . . . . . . . . . . . . . . . . . .604.0, Table 604.1,
1503.9.2 – 1503.9.4,
1505.7, 1506.7,
1602.7, K 103.4
Nonpotable water . . . . . . . . . . . .601.3, 603.5.11, 1506.6
Pipe, size of . . . . . . . . . . . . . . . . . . .610.0, Table 610.3,
Table 610.4, Table A 103.1,
Table C 303.2, Appendix M
Potable water, protection . . . . . . . . . .409.5, 410.2, 412.2,
414.2, 419.3, 602.0,
603.0, 1303.5, 1503.3,
1505.4, 1506.4, 1602.4,
E 502.3, K 101.9,
K 102.2, L 411.2
Pressure . . . . . . . . . . . . . . . . .608.0, 1603.14, A 104.3,
E 302.2.3, E 502.5, K 105.11
Quality . . . . . . . . . . . . . .601.2, 1501.7, 1505.15. 1506.8,
1506.10.2, 1601.7, 1603.5,
1603.16, E 302.1, K 101.7,
K 104.3, K 104.4
Quantity . . . . . . . . . . . . . . . . . . . .413.1 – 413.4, 416.2,
419.3, 610.3, E 302.1
Risers . . . . . . . . . . . . . . . . . . . . . . . . . .408.11, E 302.2
Tanks, water . . . . . . . . . . . . . . . . . . . . . .603.5.5, 608.1
Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .609.4
Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .606.0
SUPPORTS . . . . . . . . . . . . . . . . .221.0, 313.0, Table 313.3,
402.4, 507.3, 507.3.1,
507.4, 507.19, 509.5.8,
509.6.4, 509.7.5, 509.10.9,
609.1, 718.2, 906.4, 1208.6.2,
1208.14.1, 1210.3, 1210.3.5,
Table 1210.3.5.1, 1323.4,
1323.4.4, Table 1323.4.4,
E 402.4, E 404.2, F 901.4,
H 601.3, L 501.2
SURFACE WATER, DISCHARGE . . . . . . . . . . . . . . . . . . . . . . . . .306.2, 714.2,
811.1, 1101.1, 1101.11
SURGE TANKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .221.0
SWIMMING POOLS, SPAS, AND HOT TUBS . . . . . . . . . . . .603.5.5, 603.5.21, 813.0,
L 407.1, L 503.3.6
SYSTEMS
Chimney venting . . . . . . . . . . . . . . . .509.5.5, 509.6.2.4 Circuit venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . .911.0 Clothes washer . . . . . . . . . . . . 205.0 , 1503.1.1, 1503.1.2,
1503.1.3, 1503.2.2
Combination waste and vent . . . . . . . . . . .205.0, 910.0,
Appendix B Complex . . . . . . . . . . . . . . . . . . . . . . . . . 205.0 , 1503.1.3 Defective, testing of . . . . . . . . . . . . . . . . . . . . . .105.3.1 Dialysis water . . . . . . . . . . . . . . . . . . .603.5.18.1 , 614.0 Direct-vent . . . . . . . . . . . . . . . . . . . . . .509.6.1, 509.8.1
Durham, definition . . . . . . . . . . . . . . . . . . . . . . . . .206.0 Engineered . . . . . . . . . . . . . .509.10.8.1, 912.0, C 201.1 Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .507.21,
509.3.4, 509.6.1 Fire protection (protection from) . . . . . . . . . . . .603.5.14 Firefighter breathing air replenishment . . . . . . . . . . . . . . . . . . .Appendix F Firestop . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Chapter 14 Fire sprinklers . . . . . . . . . . . . . . . . . . . . . . . . . . . .612.1 FOG disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . .1015.0 Fuel gas piping . . . . . . . . . . . . . . . .507.18, Chapter 12,
E 401.0 – E 406.4
Fuel gas venting . . . . . . . . . . .509.0, Table 509.4, 510.0 Gray water . . . . . . . . . . . . . . . . . . . . . . .601.3.3, 1502.0 Independent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .311.0 Lightning protection . . . . . . . . . . . . . . . . . . . . . . .1211.5 Macerating toilet . . . . . . . . . . . . . . . . . . . . . . . . .710.13 Mechanical draft . . . . . . . . . . . . . . .509.3.3, 509.10.3.2,
509.10.7
Medical gas and medical vacuum . . . . . . . . . . .319.0, Chapter 13 Natural draft venting . . . . . . . . . . . . . . . . . . . .509.6.2.1 On-site treated nonpotable . . . . . . . . . . .601.3.3, 1506.0 Plumbing vent, definition . . . . . . . . . . . . . . . . . . . .218.0 Plumbing venting . . . . . . . . . .710.7, Chapter 9, C 401.0
INDEX
Potable water
Contamination and damage . . . . . .C 302.1, C 302.2, C 501.3
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218.0
Disinfection . . . . . . . . . . . . . . . . . . . . . . . . . . .609.10
Excessive water pressure . . . . . . . . . . . . . . . . .608.2
Manufactured/mobile home
park water supply . . . . . . . . . . . .E 302.1 – E 302.8 Materials . . . . . . . . . . . . . . . . . . . .604.1, Table 604.1 Peak water demand . . . . . . . . . . . . . . . . .Appendix M Sizing the water supply system . . . . . . . . . . . . . . .Appendix A, Appendix M Used piping . . . . . . . . . . . . . . . . . . . . . . . . . . . .604.8
Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .606.1
Private sewage disposal . . . . . . . . .713.2, 713.3, 713.5, 714.0, 716.1, 723.1, 904.1, Appendix H Pure water process . . . . . . . . . . . . . . . . . . . . . .603.5.18 Rainwater catchment . . . . . . .220.0, 601.3.3, Chapter 16, Appendix K, L 501.0 Reclaimed (recycled) . . . . . . . . . . . . . . .601.3.3, 1503.3, 1505.0, 1505.4, 1602.4 Sanitary drainage . . . . . . . . . . . . . . . . . . . . . .Chapter 7, E 301.0 – E 301.4.1,
E 504.1 – E 504.5
Simple . . . . . . . . . . . . . . . . . . . . . . . . . . . 221.0 , 1503.1.2 Single-stack vent . . . . . . . . . . . . . . . . . . . . . . . .C 601.0 Sprinkler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .612.0 Storm water drainage . . . . . . . .Chapter 11, Appendix D Ultraviolet water treatment . . . . .Table 611.1, 1506.10.2,
K 104.4.2, N 105.1 Vacuum drainage . . . . . . . . . . . . . . . . . . . . . . . .C 501.0 Ventilation . . . . . . . . . . . . . . . . . . . . . . .506.1.3, 506.7.3
Wet vent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .908.2.5
– T –
T RATING . . . . . . . . . . . . . . . . . . . . . . . . . . . .222.0, 1404.3,
1405.3, 1406.4
TAILPIECES
Connection . . . . . . . . . . . . . .414.3, 419.2, 910.5, 910.6
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .222.0
Maximum length of . . . . . . . . . . . . . . . . . . . .910.5, 1001.2 Sizes . . . . . . . . . . . . . . . . . .407.5, 408.5, 409.2, 420.4,
B 101.3, B 101.5, B 101.6.1
TANKS
Animals and Insects . . . . . . . . . . . . . . . . . . . . .1503.9.3
Dosing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .H 601.8 Expansion . . . . . . . . . . . . . . . . . . . .608.2, 608.3, 812.1 Flush . . . . . . . . . . . . . . . . . . .208.0, 402.4, 413.1, 601.2
Flushometer . . . . . . . . . . . . . . . . . . . . . .610.11, A 106.3 Freeze protection . . . . . . . . . . . . . . . . . . . . . . .1503.9.4 Gray water systems daily discharge . . . . . . . .1503.8.3 Hot water storage . . . . . . . . . . . . . .608.3, 608.6, 608.7, L 502.2, L 503.3.2
Materials . . . . . . . . . . . . . . . . . . . . . . . . . . .710.8, 810.2
Oil . . . . . . . . . . . . . .1017.1, E 403.12, E 403.13, E 404.6
Rainwater storage . . . . . . . . . . . . . . . .1602.7.3, 1603.6, K 102.2, K 103.3, K 105.0
Reclaimed water storage . . . . . . . . . . . . . . . . . . .1505.4 Septic . . . . . . . . . . . . . . . .714.3, 716.1, 722.2 – 722.4, Appendix H Sump or receiving . . . . . . . . . . . .710.2, 710.7 – 710.10, 810.2, 1101.7 Surge . . . . . . . . . . . . . . . .221.0, 1503.2.1, Table 1503.4 1503.9.1, 1504.10
Urinal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .603.5.2
Water closet . . . . . . . . . . . . . . . . .404.2.2, 405.1, 601.2,
603.5.2, 603.5.3, L 402.2
Water supply . . . . . . . . . . . . . . . . . . . . . . .608.1, 608.6, 608.7, E 502.7, E 506.1
TELEPHONE AND DATA
EQUIPMENT ROOMS . . . . . . . . . . . . . . . . . . . . . . .310.15
TEMPERATURE AND
PRESSURE-RELIEF VALVES . . . . . . . . . . . .504.6, 505.2
TEMPERATURE-LIMITING DEVICES . . . . . . .407.3, 408.4,
409.4, 410.3, 504.5
TEMPORARY USE OF GAS . . . . . . . . . . . . . . . . . . .1207.0
TERMINATION OF VENTS . . . . . . . . . . . . . .509.6.1, 509.8
509.8.1, 906.0, H 501.11
TESTING AGENCY, DEFINITION . . . . . . . . . . . . . . . . . 222.0
TESTS
Air . . . . . . . . . . . . .105.3, 105.3.1, 609.4, 712.3, 723.1,
1107.2.2, 1107.2.3, 1213.1.6
Alternate materials and methods . . . . . . . . . . . . . .301.3
Building sewer . . . . . .102.4.1, 105.2.1, 105.2.1.2, 723.0 Cross-connection . . . . . . . . . . . . . . . . 1502.3, 1502.3.2,
1505.14.2, 1505.14.2.2
Exceptions . . . . . . . . . . . . . . . . . . . . . . .105.3, 1107.2.3
Final . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .712.1
Fuel gas piping . . . . . . . . . . . . . . . . . . . . . . . . . .1213.0 Gauges . . . . . . . . . . . . . . . . . . . . . . . . .318.0, 1203.3.2 Percolation . . . . . . . . . . . . . . . . . . . . . . .1504.3, H 401.0 Reclaimed (recycled) water . . . . . . . . . . . . . . .1505.16 Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105.3 Responsibility for . . . . . . . . . . . . . . . . . . . . . . . .105.2.5 Shower receptors . . . . . . . . . . . . . . . . . . . . . . . .408.8.5 Storm drainage . . . . . . . . . . . . . . . . . . . . . . . . . .1106.0 Testing agency . . . . . . . . . . . . . .222.0, 301.3.1.1, 505.4, 610.2, 1406.4
Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . .609.4, 712.2,
1107.2.1, 1107.2.3
Water supply systems . . . . . . . . . . . . . .105.2.1.1, 609.4 THREADED JOINTS . . . . . . . . . . . .605.1.5, 605.2.3, 605.5.2,
605.11.3, 605.12.3, 605.16.1,
705.1.3, 705.3.4, 705.4.2,
705.6.3, 705.10.2, 1208.5.8,
1208.5.9.1, 1322.5
THREE SINGLE
COMPARTMENT SINKS . . . . . . . . . . . . . . . . . . . . .1001.2
TOILET, DEFINITION . . . . . . . . . . . . . . . . . . . . . . . . . . . 222.0
TOILET FACILITY, DEFINITION . . . . . . . . . . . . . . . . . . . 222.0
582 2025 CALIFORNIA PLUMBING CODE
INDEX
TOILET ROOM, DEFINITION . . . . . . . . . . . . . . . . . . . . 222.0
TOILETS . . . . . . . . . . . . . . . . . . . . . . . . .(see Water closets) TOILETS, FAMILY
OR ASSISTED – USE FACILITY . . . . . . . . . . . . . .422.1.2
TRACER WIRE . . . . . . . . . . . . . . . . . . .604.10.1, 1210.1.7.2
TRANSITION GAS RISER . . . . . . . . . . . . . .222.0, 1210.4.4
TRANSITION JOINTS . . . . . . . . . . . . . . . . . . . . . . . .705.9.4
TRAPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Chapter 10
Arms . . . . . . . . . . . . . . . . . .222.0, Table 702.1, 707.14,
1002.2, Table 1002.2, 1002.3
Bar and fountain sinks . . . . . . . . . . . . . . . . .801.4, 902.2
Building . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1008.0
Bottle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1004.1
Condensers and sumps . . . . . . . . . . . . . . . . . . . . .810.1
Crown weir . . . . . . . . . . . . . . . . . . .222.0, 409.6, 905.5,
1001.2, 1002.2, 1002.4
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .222.0
Drum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1004.1
Floor drains . . . . . . . . . . . . . . . . . . . . . . .704.3, 1003.1,
1006.0, 1007.1
Food storage areas . . . . . . . . . . . . . . . . .418.4, 801.3.2 For three-compartment
sinks or three lavatories . . . . . . . . . . . . . . . . . .1001.2
From fixture, distance of . . . . . . . . . . . . . . . . . . . .1001.2
From vent, distance of . . . . . . . . . .1002.2, Table 1002.2
Gray water system . . . . . . . . . . . . . . . . . . . . . .1503.9.6 Grease interceptors . . . . . . . . . . . . . . . . . . . . . .1014.1.1
Indirect wastes . . . . . . . . . . . . . . . . . . . . . . . . . . .803.3
Integral . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1001.2
Island sinks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .909.1
Materials . . . . . . . . . . . . . . . . . . . . .807.2, 906.6, 1003.1
Minimum size . . . . . . . . . . . .702.1, Table 702.1, 1003.3
Nonwater urinals . . . . . . . . . . . . . . . . . . . . . . . . .412.1.1
Prohibited types . . . . . . . . . . . . . . . . . . . . . . . . . .1004.0 Required . . . . . . . . . . . . . . . . . . . . . . . . .1001.0, 1101.15
Seal . . . . . . . . . . . . . . . . . . . . . . .222.0, 412.1.1, 912.2,
1005.0, 1007.1, E 501.6
Seal primer . . . . . . . . . . . . . . . . . . . . . . . .222.0, 1007.1 Separate for each fixture . . . . . . . . . . . . . . . . . . .1001.2 Slip joints . . . . . . . . . . . . . . . . . . . . . . . .705.9.1, 1003.2 Standpipe receptors . . . . . . . . . . . . . . . . . . . . . . .804.1
Storm drains and leaders . . . . . . . . . . . . . . . . . .1101.15
Unions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .315.1
Unit loading . . . . . . . . . . . . . . . . . . .702.0, Table 702.1,
Table 703.2
Vacuum drainage system . . . . . . . . . . . . . . . . . .C 501.0
Vents for . . . . . . . . . . . . . . . . .Table 703.2, 810.1, 901.0,
905.2, 905.5, 908.2.1,
909.1, 1002.0, Table 1002.2
TREATED GRAY WATER, DEFINITION . . . . . . . . . . . . . 222.0
TRENCHING, EXCAVATION,
AND BACKFILLING . . . . . . . . . . . . . . . . . .314.0, 1203.2,
1210.1.1 – 1210.1.2.1, 1323.5.1
TROUGH URINALS,
PROHIBITED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .405.2
TUBING, COPPER . . . . . . . . . . .Table 604.1, 604.3, 604.4,
605.1, 609.1, 609.3, 701.2,
Table 701.2, 903.2, 1208.5.3.3,
A 105.2, E 403.5
TUNNELING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .314.2
TYPE B
GAS VENTS . . . . . . . . . . . . . . .224.0, 509.1, Table 509.4,
509.5.5, 509.6.1, 509.6.2.1,
509.6.2.2, 509.6.3.2,
Table 509.7.3.4(1), 509.7.3.5,
509.10.1.1, 509.10.1.2,
509.10.8.2, 509.10.13, 510.1.6,
510.1.10, 510.2.2, 510.2.15,
510.2.19, 510.2.20,
510.2.22, Appendix G
TYPE BW GAS VENTS . . . . . . . .224.0, Table 509.4, 509.6.1,
TYPE L GAS VENTS . . . . . . . . . . . . . . .224.0, Table 509.4,
509.6.1, 509.6.2.2,
Table 509.7.3.4(1), 509.10.1.1,
509.10.1.2, 509.10.12
– U –
UNDERGROUND
Backflow prevention devices . . . . . . . . . . . . . . .603.4.9 Building storm drains . . . . . . . . . . . . . . . . . . . . .1101.4.4 Drainage piping . . . . . . . . . . . .701.2, Table 701.2, 720.0 Fuel gas piping . . . . . . .1203.2, 1208.5.2.4, 1208.5.3.4,
1210.1, E 401.2, E 402.2,
E 403.7, E 403.8, E 403.8.4
Gray water piping . . . . . . . . . . . . . . . . . . . . . . .1503.9.2 Medical gas and medical vacuum piping . . . . . . . . . . .1323.2, 1323.5.1 Stop-and-waste valves . . . . . . . . . . . . . . . . . . .603.5.17 Storm water piping . . . . . . . . . . . . . . . . .1101.4, 1101.4.2
Tanks . . . . . . . . . . . . . . . . .1503.9.1, 1601.11.2, 1603.8,
E 403.11, K 105.0
Unions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .315.1
Vent material . . . . . . . . . . . . . . . . . . . . . . . .903.1, 903.2
Water piping . . . . . . . . . . . . . . .604.3, 609.9, 1506.10.4
UNIONS
Dielectric . . . . . . . . . . . . . . .605.15, 605.16.1, 605.16.3
Fuel gas piping . . . . . . . . . . . . . . . . . . .1212.6, E 404.2
Location . . . . . . . . . . . . . . . . . . . . . .315.1, 609.5, 710.6
Medical gas and medical vacuum piping . . . . . . . . . . . . . . . . . .1322.7 Sump pump . . . . . . . . . . . . . . . . . . . . . . . . . . . .1101.6.2
Where allowed . . . . . . . . . . . . . . . . . . . . . . . . . . . .315.1
UNIT LOADING OF TRAPS . . . . . . . .702.1, Table 702.1(1) UNITS, FIXTURE . . . . . . . . . . . . . . . . . . .(see Fixture, units)
UNLAWFUL CONNECTIONS . . . . . . .404.2, 602.0, 1205.2
UNSANITARY, DEFINITION . . . . . . . . . . . . . . . . . . . .223.0
INDEX
UPC, DEFINITION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223.0
URINALS . . . . . . . . . . . . . . . . . .402.5, 402.6, 405.2, 412.1,
412.1.1, 412.1.2, 412.1.3, 412.1.4,
412.1.4.1, 413.0, 418.3, 601.2,
603.5.1, 603.5.2, 707.4, 710.3,
910.7, 1003.1, 1014.1, 1014.3.2.1,
1501.9, 1505.1, 1506.1, 1506.10.2,
1506.10.5, 1602.1, 1603.14, 1603.19,
1604.2, E 501.2, E 501.5,
K 105.11 L 402.3
USE OF ALTERNATE MATERIAL . . . . . . . . . . . . . . . .301.3
USER OUTLET, DEFINITION . . . . . . . . . . . . . . . . . . .223.0
– V –
VACUUM BREAKERS . . . . . . . . . . . .224.0, 412.2, 601.3.4,
Table 603.2, 603.3.2,
603.3.5, 603.3.6, 603.4.4,
603.5.1, 603.5.5, 603.5.6,
603.5.7, 603.5.9, 603.5.13,
603.5.15, 603.5.16, 1303.5,
C 501.3, E 505.4, E 506.1
VACUUM DRAINAGE SYSTEMS . . . . . . . . . . . . . . .C 501.0
VACUUM RELIEF VALVES . . . . . . . . . . . . . . . . .224.0, 504.6,
608.7, 1602.9
VACUUM SYSTEM –
LEVEL 1, DEFINITION . . . . . . . . . . . . . . . . . . . . . . .224.0
VALIDITY OF CODE . . . . . . . . . . . . . . . . . . . . . . . . . . .101.5
VALVES
Access door signs . . . . . . . . . . . . . . . . . . . . . .1505.8.2
Backwater . . . . . . . . . . . . . . . . . . . .204.0, 710.1, 710.3,
710.6, 1006.1, 1503.2.3,
1503.9.1, 1503.9.7,
1603.9, K 105.4
Balancing, definition . . . . . . . . . . . . . . . . . . . . . . .224.0
Ball . . . . . . . . . . . . . . . . . . . . . . . . .606.1, 606.4, 710.4,
710.6
Bathtub filler . . . . . . . . . . . . . . . . . . . . . . . . . . . . .409.5
Check . . . . . . . . . . . . . . . . . . . .603.5.10, 608.3, 710.4,
710.12.1, 710.13.2,
1004.2, 1208.11.1,
1309.11, 1311.5,
1313.5, F 701.3
Combination stop-and-waste . . . . . . . . . . . . . .603.5.17 Combination temperature
and pressure-relief . . . . . . . . . . . . . . . . .505.2, 608.3
Combination thermostatic/
pressure balancing . . . . . . . . . . . . . . . . .205.0, 408.4
Control . . . . . . . . . . . . . . . . . . . . . .408.10, 601.2, 606.5,
606.6, 1303.1, 1306.2,
C 501.3
Diaphragm-type . . . . . . . . . . . . . . . . . . .507.22, 1208.11
Excess flow . . . . . . . . . . . . . . . . . . . . . . . .207.0, 1209.0
Flow balancing . . . . . . . . . . . . . . . . . . . . . . . . . .L 501.7
Flush, definition . . . . . . . . . . . . . . . . . . . . . . . . . . .208.0
Flushometer . . . . . . . . . . . . . .208.0, 411.2.2, 411.2.2.1,
413.1, 413.2, 601.2, 603.5.1,
610.10, Table 610.10,
L 402.2.2
Fullway . . . . . . . . . . . . . . . . . . . . . . . . . . . .606.2, 710.6
Gate . . . . . . . . . . . . . . . . . . .606.1, 606.4, 710.3, 710.4,
710.6
Gray water diverter . . . . . . . . . . . . . . . . . . . . . .1503.2.2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .310.7
Isolation . . . . . . . . . . . . . . . . . .224.0, F 501.7, F 601.5.1,
F 701.3, F 801.6
Mixing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .417.5
Pre-rinse spray . . . . . . . . . . . . . . . . . . . .420.3, L 201.0,
Table L 402.1, L 402.8
Pressure-balancing . . . . . . . . . . . . . . . . . . .218.0, 408.4
Pressure-reducing . . . . . 1504.5.2(6), 1504.5.7, 1603.13,
A 107.2, E 403.13,
F 701.3, K 105.11
Pressure-relief . . . . . . . . . . .504.4, 504.6, 505.2, 507.9,
607.6, 608.2 – 608.6,
1208.10.4, 1306.2, 1308.2,
1308.3, 1309.5, 1310.3,
1310.4, 1315.15, 1316.1,
1324.4, 1324.5, 1327.7.1,
E 302.5, E 302.6, F 501.8,
F 701.3
Quick-acting . . . . . . . . . . . . . . . . . . . . . . . . . . . . .609.11
Riser . . . . . . . . . . . . . . . . . . . . . . . . . . . .224.0, 1314.8,
1323.14.4
Seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1505.9.1
Service . . . . . . . . .224.0, 1314.9, 1323.14.5, E 402.4.2
Shutoff . . . . . . . . . . . . . . . . . . . . . .504.6, 606.2, 606.3,
606.6, 608.4, 609.9,
710.12.1, 1202.1,
1203.3.2, 1208.11, 1208.12,
1210.3.3.1, 1210.8.2,
1210.9 – 1210.9.5, 1210.11,
1210.12.5, 1212.3.1, 1212.3.2,
1212.5.3, 1212.6, 1212.7,
1213.2.5, 1213.6.1.4, 1310.3.2,
1312.2, 1314.6, 1323.14,
1327.2, 1503.9.1, E 302.3,
E 402.3, E 402.4.2, E 403.0,
E 403.9, E 403.13, E 404.5,
E 505.4, E 506.1, F 601.1,
K 105.4, L 402.3.1, L 404.6,
L 410.3, L 413.4
Signs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1505.9.2
Source . . . . . . . . . . . . . . . . . . . . .224.0, 1314.6, 1314.7,
1323.14.2, 1324.5.4.2
Temperature relief . . . . . . . . . . . . . .504.5, 504.6, 505.2
584 2025 CALIFORNIA PLUMBING CODE
INDEX
Thermostatic . . . . . . . . . . . . . . . . . . . . . . .222.0, 408.4
Vacuum interface . . . . . . . . . . . . . . . . . . . . . . .C 501.2.4
Vacuum relief . . . . . . . . . . . .224.0, 504.6, 607.5, 608.7,
1505.11, 1506.10.3, 1602.9
Zone . . . . . . . . . . . . . . . . . . . . . . . . . . . . .224.0, 1314.4
VENT, PLUMBING . . . . . . . . . . . . . . . . . . . . . . . .Chapter 9
Below trap weir . . . . . . . . . . . . . . . . . . . . .905.5, 1002.4
Branch, definition . . . . . . . . . . . . . . . . . . . . . . . . .204.0
Buildings over 10 stories . . . . . . . . . . . . . . . . . . . .907.1 Changes in direction of . . . . . . . . . . . . . . . . . . . . .903.3
Chemical . . . . . . . . . . . . . . . . . . . . . .811.2, 811.5, 811.6
Combination waste and
vent system design . . . . . . . . . . . . . . . . .205.0, 910.0,
Appendix B
Connections . . . . . . . . . . . . .310.2, 805.0, Table 810.1,
905.1, 905.2, 908.1.2,
908.2.1, 911.2, 1503.2.2
Continuous, definition . . . . . . . . . . . . . . . . . . . . . .205.0
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .224.0
Distance of trap from . . . . . . . . . . .1002.2, Table 1002.2
Double fitting for . . . . . . . . . . . . . . . . . . . . .704.2, 905.6
Engineered . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .912.0
Expansion joints . . . . . . . . . . .705.9.2, 1101.5, 1213.2.2
Fittings . . . . . . . . . . . . . . . . . . .701.2, Table 701.2, 903.1
Fixtures, back-to-back . . . . . . . . . . . . . . . .704.2, 905.6
Flagpoling, prohibited . . . . . . . . . . . . . . . . . . . . . .906.3
Flashing for . . . . . . . . . . . . . . . . . . .312.8, 701.5, 906.1,
906.5, 906.6
Frost or snow closure . . . . . . . . . . . . . . . . . . . . . .906.7
Grade of . . . . . . . . . . . . . . . . . . . . . .905.1, 905.3, 911.4
Height above fixture . . . . . . . . . . . . . . . . . . . . . . .905.3
Height above grade . . . . . . . . . . . . . . . . . . . . . . . .906.4
Horizontal . . . . . . . . . . . . . . . .Table 703.2, 904.2, 905.3
Indirect waste . . . . . . . . . . . . . . . . .803.3, 805.1, 902.1
Individual, definition . . . . . . . . . . . . . . . . . . . . . . . .211.0
Interceptors . . . . . . . . . . . . . . . .902.1, 1009.4, 1014.1.1,
1014.2.2, 1016.4, 1017.1
Island sinks and fixtures . . . . . . . . . . . . . . . . . . . .909.0
Length of . . . . . . . . . . .Table 702.1, Table 703.2, 904.0
Material for . . . . . . . . . . . . . . . . . . . . .701.0, Table 701.2,
811.2, 903.0, 1503.9.2
Method of installation . . . . . .310.5, 903.3, 906.2, 906.4
Not required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .902.0
Not to be used as
soil or waste pipe . . . . . . . . . . . . . . . . . . . . . . . .310.4
Opening location . . . . . . . . . . . . . . . . . . .905.5, 1002.4
Parallel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .907.1
Piping, support of . . . . . . . . . . . . . . . . . . . . .Table 313.3
Prohibited . . . . . . . . . . . . . . . . . . .310.4, 903.1, 903.2.2
Relief . . . . . . . . . . . . . . . . . . . . . . . . . . . . .220.0, 805.0,
907.0, 911.3, 1009.4
Required . . . . . . . . . . . . . . . . . . . . . . . . . . .901.2, 904.1
Required separately
on every trap . . . . . . . . . . . . . . . .901.2, 1002.1, 1002.2 Sizing . . . . . . . . . . . . . .Table 702.1, 703.0, Table 703.2,
904.0, 908.1.1, 908.1.2,
908.2.2, 910.4, C 401.0,
Table C 401.1, C 601.2
Special . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .909.0
Stack . . . . . . . . . . . . . . . . . . . . . . . . . . . . .224.0, 906.1,
907.0, C 401.2, C 601.2
Sump . . . . . . . . . . . . . . . . . . . .710.7, 710.10, 710.13.3,
810.1, Table 810.1
System, definition . . . . . . . . . . . . . . . . . . . . . . . . .224.0
Termination . . . . . . . . . . . . . . . . . .905.4, 906.0, 906.2.1
Testing . . . . . . . . . . . . . . . . . . . . . . . . . .712.0, 1504.10 Trap seal protection . . . . . . . . . . . . . . . . . .901.3, 1002.0
Undiminished in
size through roof . . . . . . . . . . . . . . . . . . .905.4, 907.1 Unit loading . . . . . . . . . . . . . . . . . . . . . . . . .Table 703.2
Wet, Horizontal . . . . . . . . . . . . . . . . . . . . . . . . . . .908.2
Wet, Vertical . . . . . . . . . . . . . . . . . . . . . . . . . . . . .908.1
Yoke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .227.0, 907.0
VENTED APPLIANCE, DEFINITION . . . . . . . . . . . . . .224.0
Category I Vented Appliance, definition . . . . . . . . .224.0 Category II Vented Appliance, definition . . . . . . . .224.0 Category III Vented Appliance, definition . . . . . . . .224.0 Category IV Vented Appliance, definition . . . . . . .224.0 VENTILATING HOODS . . . . . . . . . . . . . . . .509.2.4, 509.3.4
VERTICAL-TO-HORIZONTAL
DRAINAGE FITTINGS . . . . . . . . . . . . . . . . . . . . . . .706.4
VERTICAL WET VENTING . . . . . . . . . . . . .(see Wet vents) VIOLATION, NOTICES OF . . . . . . . . . . . . . . . . . . . . . .106.2
VITRIFIED CLAY PIPE . . . . . . . . .701.2, Table 701.2, 705.8,
811.2, Table 1101.4.6
– W –
WALL, EXTENSION THROUGH . . . . .312.1, 509.6.1, 509.8
WALL-HUNG FIXTURES,
INSTALLATION OF . . . . . . . . . . . . . . . . . . . . .402.4, 402.6
WASH FOUNTAINS . . . . . . . . . . . . . . . . . . . . . 417.1.1, 417.1.2
WASH RACKS, AUTO . . . . . . . . . . . . . . . . . . . . . . . . . 1011.0
WASTES
Anesthetic gas disposal . . . . . . . . . . . . . . . . . . . .1301.2 Chemical . . . . . . . . . . . . . . . . . . . .205.0, 811.0, 903.2.2
Clear water . . . . . . . . . . . . . . . . . . . . . . . . .205.0, 812.0
Condensate . . . . . . . . . . . . . . . . . . . . . . . . .807.2, 814.0
Continuous . . . . . . . . . . . . . . . . . . . . . . . . .205.0, 407.5,
408.5, 409.2, 419.2
Cooling water . . . . . . . . . . . . . . . . . . . . . . . . . . . .808.0
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .225.0
Detrimental or harmful . . . . . . . . . .305.1, 306.1, 714.1,
811.1, 1009.1, H 901.1
Flammable . . . . . . . . . . . . . . . . . . . . . . .1009.1, H 901.1
Indirect . . . . . . . . . . . . . . . . . . . . . .Chapter 8, 1303.4.1
INDEX
Industrial . . . . . . . . . . . . . . . . . . . . .211.0, 306.0, 801.1,
811.1, 903.2.2
Liquid . . . . . . . . . . . . . . . . . .214.0, 303.0, 304.0, 710.2, 811.1, 1006.1, 1009.1, H 101.3,
H 701.1, H 901.1, L 302.0
Materials, pipe . . . . . . . . . . . . . . . . . . . . . . .701.1, 811.2 Pipe, definition . . . . . . . . . . . . . . . . . . . . . . . . . . . .225.0 Pretreatment required . . . . . . . . . . . . . . . . .811.1, 1014.1
Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1013.1
Special, definition . . . . . . . . . . . . . . . . . . . . . . . . . .221.0 Swimming pools . . . . . . . . . . . . . . . . . . . . . . . . . .813.1
WATER
Backflow prevention . . . . . . . . . . . . .Table 603.2, 603.3 Cross contamination . . . . . . . . . . . . . . . . .601.2, 602.2,
603.1 – 603.3.10
Distribution piping material . . . . . . . .604.1, Table 604.1 Distribution system design . . . . . . . . . . . . . . . . . . .601.1 Excessive pressure . . . . . . . . . . . . . . . . . . . . . . . .608.2
Hammer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .609.11
Heating system requirements for California Energy Code . . . . . . . . . . . . . . . . . . .501.2
Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .601.3
Lead content . . . . . . . . . . . . . . . . . . . . . .604.2, 604.2.1
Minimum quality requirements for reclaimed (recycled) water . . . . . . . . . . . . . . .1505.15 Nonpotable . . . . . . . . . . . . . . . . . . . . .603.5.11, 1506.7, 1506.10.5, L 408.1
Rainwater, material . . . . . . . . . . . . . . . . . . . . . . . .1101.4
Reclaimed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1602.4
Storm water . . . . . . . . . . . . . . . . .(see Storm drainage) Submeters . . . . . . . . . . . . . . .601.2.1, 601.2.1.1, 601.2.1.2 Supply demand . . . . . . . . . . .A 103.1, C 303.2, M 102.5 Supply piping material . . . . . . . . . . . .604.1, Table 604.1
Treatment units . . . . . . . . . . . . . . . . . . . . . . . . . . . .611.0
WATER CLOSETS . . . . . . . . . . . . . . . . . . . . . .411.0, 411.2.4
Approved standards . . . . . . . . . . . . . . . . . . . . . . . .411.1
Clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .402.5
Compartments . . . . . . . . . . . . . . . .E 501.3.2, E 501.3.3
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225.0
Effective flush volume . . . . . . . . . . . . . . . . . . . . . .411.2
Flanged fixture Connection . . . . . . . . . . . . . . . . . .402.6 Floor-mounted, back-outlet . . . . . . . . . . . . . . . . .402.6.3
Flushometer Valve Activated . . . . . . . . 411.2.2, 411.2.2.1
Manufactured/Mobile home . . . . . . . . .E 501.2, E 501.3,
Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . .411.2.3
E 501.3.1, E 501.6
Prohibited . . . . . . . . . . . . . . . . . . . . . . . . . .405.1, 910.7
Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .411.3
Water consumption . . . . . . . . . . . . . . . . .411.2, L 402.2
WATER-CONSERVING
FIXTURES AND FITTINGS . . . . . . . . . . . . . 401.3, L 402.0
WATER CONSUMPTION
Lavatories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .407.2
Showerhead & body sprays . . . . . . . . . . . .408.2, 408.3
Water closets . . . . . . . . . . . . . . . . . . . . . . . . . . . . .411.2
WATER HAMMER ARRESTORS . . . . . . . . . .225.0, 609.11
WATER HEATERS . . . . . . . . . . . . . . . . . . . . . . . .Chapter 5
Access . . . . . . . . . . . . . . . . . . . . . . . .504.3.1, 507.13.2,
507.25, 508.4
Approval requirements . . . . . . . . . . . . . . . . . . . . . .501.1 Approved standards . . . . . .Table 501.1(1), 505.3, 505.4 Clearances. . . . . . . . . . . . . . . . . . . . . . 504.3 – 504.3.2,
508.1, 508.2.1
Combustion air required . . . . . . . . . . . . . . . . . . . .506.0
Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . .604.13
Dual purpose, definition . . . . . . . . . . . . . . . . . . . .225.0
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .225.0
Garages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .507.13 Inspections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .503.2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .507.0
Location . . . . . . . . . . . . . . . . . . .504.1, 507.12 – 507.15
Oil-burning and other . . . . . . . . . . . . . . . . . . . . . .505.0 Permits required . . . . . . . . . . . . . . . . . . . . . . . . . .502.0
Pressure-relief valves . . . . . . . . . . .504.4, 504.6, 505.2,
608.2 – 608.5
Protection . . . . . . . . . . . . . . . . . . .504.3 – 504.6, 505.2,
507.2, 507.8, 507.10,
507.14.1, 507.24
Relief valve discharge . . . . . . . . . . . . . . . . . . . . . .608.5 Seismic provisions . . . . . . . . . . . . . . . . . . . . . . . . .507.2 Temperature and pressure-relief valves . . . . . . . . . . . . . . .504.6, 505.2 Temperature-limiting devices . . . . . . . . . . . . . . . . .504.5
Vents . . . . . . . . . . . . . . . . . . . . . . . . . . . . .509.0, 510.0
Water heating system requirements . . . . . . . . . . . .501.2 WATER SOFTENERS . . . . . . . . . . . . . . . . 611.4, Table 611.4
WATER STATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . .225.0
WATER TESTS
Building sewers . . . . . . . . . . . . . . . . . . . . . . . . . . .723.0 Drainage and vent systems . . . . . . . . . . . . .105.3, 712.2 Storm drainage . . . . . . . . . . . . . . . . . .1107.2.1, 1107.2.3 Water supply systems . . . . . . . .105.2.1.1, 105.3, 609.4
WATERPROOFING
AND WATERTIGHT
Building sewer . . . . . . . . . . . . . . . . . . . . . . . . . . . .723.1
Cleanouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .707.3
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105.3
Drain pans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .507.5
Fixtures . . . . . . . . . . . . . . . . .402.2, 408.6, 408.8, 418.2
Flashings . . . . . . . . . . . . . . . . . . . .312.8, 906.5, 1102.3 Interceptors . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1016.3
Joints . . . . . . . . . . . . .105.3, 1504.7.3, H 601.4, H 601.6,
H 601.7, H 601.10, H 801.4
Openings . . . . . . . . . . . . . . . . . . .312.8, 312.10.2, 317.1 Sump or receiving tanks . . . . . . . . . . . . . . .710.2, 710.8
Tanks . . . . . . . . . . . . . . . . . . . . . . . . . .714.5, 1503.9.1,
1504.10, H 501.3,
H 1001.2, K 105.2
Vacuum drainage systems . . . . . . . . . . . . . . . . .C 501.8
586 2025 CALIFORNIA PLUMBING CODE
INDEX
WATER/WASTEWATER
UTILITY, DEFINITION . . . . . . . . . . . . . . . . . . . . . . . . . .225.0
WEEP HOLES, SUBDRAIN
OF SHOWER STALLS . . . . . . . . . . . . . . . . . . . . . . . . .408.7
WEIGHT OF FLASHING, LEAD . . . . . .701.5, 906.6, 1102.3.1
WEIGHTS AND QUALITY
OF MATERIALS . . . . . . . . . . . . . . . . .301.2, 401.2, 604.1,
701.2, 906.6, 1102.3.1
WELDED JOINTS . . . . . . . . . . . . .212.0, 605.13.2, 705.7.2,
1208.5.9.1, 1208.5.9.3,
1322.1, F 1101.2
WELDER, PIPE, DEFINITION . . . . . . . . . . . . . . . . . . .225.0
WELL, DISTANCE FROM
SEWAGE DISPOSAL . . . . . . . . . . . . . .721.1, Table 721.1,
H 101.8, Table H 101.8
WET VENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .908.0
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .225.0
Fixtures . . . . . . . . . . . . . . . . . . . . . . . . . .908.2.3, 908.2.4
Horizontal . . . . . . . . . . . . . . . . . . .908.2, B 101.2, C 601.6
Vent connection . . . . . . . . . . . . . . . . . . . . . . . . . . . .908.2
Vertical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .908.1
WHIRLPOOL BATHTUBS . . . . . . . . . . . . . . . .225.0, 409.0
WINDOW, TERMINATION
OF VENTS FROM . . . . . . . . . . . . . . . . . . . . . . . . . . .906.2
WOODEN SINKS AND TILE
WASH SINKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .405.3
WORK, CONCEALED . . . . . . . . . .105.0 – 105.2.1.2, 309.2,
402.10, 503.0 – 503.2,
509.7.3.2, 1004.1,
1203.2, 1203.3,
1210.4, 1212.3.1,
1212.5.3, 1213.2.1,
1303.2, 1323.6, 1406.1
WORK, EXISTING . . . . . . . . . . . . . . . . . .102.2, 102.4, 207.0
WORKMANSHIP . . . . . . . . . . . . . . . .309.0, 609.1, 1208.5.7
WRAPPING OF PIPE . . . . . . . . . . . . . . . . . . . . . . . . .609.3,
1210.3, E 403.6
WROUGHT IRON
(GALVANIZED) . . . . . . . . . .402.6.1, Table 604.1, 604.6,
604.7, 701.2, 707.1, 1101.4,
1208.5.2.2, 1208.5.9.5,
E 403.5
WYE CONNECTIONS . . . . . . . . . . . . . . . . . . . 414.3, 419.2,
706.2 – 706.4,
707.5, 707.6,
710.4, 719.4, 907.2,
909.1, 1101.16.2
– X –
X-RAY DARKROOMS . . . . . . . . . . . . . . . . . . . . . . . . . .811.8
– Y –
YOKE VENTS . . . . . . . . . . . . . . . . . . . . . . . . . . .227.0, 907.0
– Z –
ZINC ALLOY COMPONENTS . . . . . . . . . .406.4, 1208.5.9.5
588 2025 CALIFORNIA PLUMBING CODE
HISTORY NOTE APPENDIX
CALIFORNIA CODE OF REGULATIONS, TITLE 24, PART 5
HISTORY:
For prior code history, see the History Note Appendix to the California Plumbing Code, 2022 Triennial Edition, effective January 1, 2023.
1. (BSC 02/24, DSA-SS 02/24, DSA-SS 01/24 CWoRE, DWR 01/24, HCD 03/24, OSHPD 02/24, SFM 02/24) Adoption by reference the 2024 Uniform Plumbing Code with necessary amendments to become the 2025 Cali- fornia Plumbing Code, and repeal of the 2021 edition of the Uniform Plumbing Code. Effective on January 1, 2026.
590 2025 CALIFORNIA PLUMBING CODE
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Ask AI about this code▸Contents — California Plumbing Code (Title 24, Part 5)
- Chapter 1 — GENERAL CODE PROVISIONS
- Chapter 2 — DEFINITIONS
- Chapter 3 — GENERAL REGULATIONS
- Chapter 4 — PLUMBING FIXTURES AND FIXTURE FITTINGS
- Chapter 5 — WATER HEATERS
- Chapter 6 — WATER SUPPLY AND DISTRIBUTION
- Chapter 7 — SANITARY DRAINAGE
- Chapter 8 — INDIRECT WASTES
- Chapter 9 — VENTS
- Chapter 10 — TRAPS AND INTERCEPTORS
- Chapter 11 — STORM DRAINAGE
- Chapter 12 — FUEL GAS PIPING
- Chapter 13 — HEALTH CARE FACILITIES AND MEDICAL GAS AND MEDICA…
- Chapter 14 — FIRESTOP PROTECTION
- Chapter 15 — ALTERNATE WATER SOURCES FOR NONPOTABLE APPLICATIONS
- Chapter 16 — NONPOTABLE RAINWATER CATCHMENT SYSTEMS
- Chapter 17 — REFERENCED STANDARDS
- Appendix A — RECOMMENDED RULES FOR SIZING THE WATER SUPPLY SYS…
- Appendix B — EXPLANATORY NOTES ON COMBINATION WASTE AND VENT S…
- Appendix C — ALTERNATE PLUMBING SYSTEMS
- Appendix D — SIZING STORM WATER DRAINAGE SYSTEMS
- Appendix E — MANUFACTURED/MOBILE HOME PARKS AND RECREATIONAL V…
- Appendix F — FIREFIGHTER BREATHING AIR REPLENISHMENT SYSTEMS
- Appendix G — SIZING OF VENTING SYSTEMS
- Appendix H — PRIVATE SEWAGE DISPOSAL SYSTEMS
- Appendix I — INSTALLATION STANDARDS
- Appendix J — COMBINATION OF INDOOR AND OUTDOOR COMBUSTION AND …
- Appendix K — POTABLE RAINWATER CATCHMENT SYSTEMS
- Appendix L — SUSTAINABLE PRACTICES
- Appendix M — PEAK WATER DEMAND CALCULATOR
- Appendix N — IMPACT OF WATER TEMPERATURE ON THE POTENTIAL FOR …
- Appendix O — NON-SEWERED SANITATION SYSTEMS
- Appendix P — PROFESSIONAL QUALIFICATIONS
- Appendix Q — INDOOR HORTICULTURAL FACILITIES
- Appendix R — TINY HOUSES
▸Appendix S — ONSITE STORMWATER TREATMENT SYSTEMS