Index — R
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
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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
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
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