Skip to content

Earlier editions: 20222019

Index

Index — W

California Plumbing Code (Title 24, Part 5) · 2025 edition · updated 2026-10-23 · California

CBSC: official editions, supplements and errata

Italicized text is a California amendment to the model code, as printed in the official publication.

Cite as: 2025 California Plumbing Code (Title 24, Part 5) · Effective January 1, 2026 · Official source: Building Standards Commission

– 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

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

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

Get a plain-English answer with a citation back to this text.

Ask AI about this code
▸Contents — California Plumbing Code (Title 24, Part 5)

GoCodebook provides public access, search, citation, multilingual explanation, and practical interpretation of legally adopted building regulations. It is not a substitute for the official ICC or California code publications.