Index — B
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
– B –
BACKFILLING . . . . . . . . . . . . . . .314.4, 314.4.1, 1210.1.2.1,
1323.5.1, 1323.5.4, 1323.5.5,
1504.7.2, H 601.2
BACKFLOW
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204.0
Prevention . . . . . . . . . . . . . . . . . . . . . . . . . 602.2, 602.3
Prevention devices
or assembly . . . . . . . . . . . . 603.1, Table 603.2, 603.3
BACKFLOW CONNECTION . . . . . . . . . . . . . . .204.0, 603.0
BACKFLOW PREVENTERS
Approved standards . . . . . . . . . . . . . . . . . . .Table 603.2
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .204.0
For hot water . . . . . . . . . . . . . . . . . . . . . . . . . . .603.4.5
Integral . . . . . . . . . . . . . . . . . . . . . . . . . . . .417.2, 417.3,
417.4, 603.4.6
Prohibited locations . . . . . . . . . . . . . . . . . . . . . .603.4.9
Protection from damage . . . . . . . . . . . . . . . . . . .E 302.6 Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .603.2 BACKFLOW PREVENTION . . . . . . . . . . . . . . .602.3, 603.3
BACK-TO-BACK FIXTURES . . . . . . . . . . . . . . . . . . . .704.2
BACKWATER VALVES
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204.0
Where Required. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 710.6 BALLCOCKS . . . . . . . . . . . . . . . . . . . .Table 603.2, 603.5.2
BAPTISTRIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .406.1
BATHROOM, HALF, DEFINITION . . . . . . . . . . . . . . . .204.0
BATHROOM GROUP . . . . . . . . . . . . .204.0, 908.2, C 303.0
BATHTUB, PROHIBITED TYPE . . . . . . . . . . . . . . . . .405.3
BATHTUBS AND
WHIRLPOOL BATHTUBS . . . . . . . . . . . . . . . . . . . .409.0
BIDETS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .402.5, 410.0
BLOWOFF CONDENSERS . . . . . . . . . . .810.1, Table 810.1
BOARD OF APPEALS . . . . . . . . . . . . . . . . . . . . . . . . .107.0
BODY SPRAY, DEFINITION . . . . . . . . . . . . . . . . . . . .204.0
BOILER BLOWOFF
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .204.0
Discharge requirements . . . . . . . . . . . . . . . . . . . .810.1
BONDING JUMPER
Bonding of CSST fuel gas piping . . . . . . . . . . . . .1211.2
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .204.0
BOTTLING ESTABLISHMENTS . . . . . . . . . . . . . . . .1013.0
BUILDING DRAIN
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .204.0
Existing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .102.4.1
Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Table 701.2
Sizing . . . . . . . . . . . . . . . . . .703.0, Table 703.2, 710.5, C 304.2, Table C 304.2
Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .712.0 BUILDING DRAIN (STORM), DEFINITION . . . . . . . . .204.0
BUILDING SEWERS
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .204.0
Existing . . . . . . . . . . . . . . . . . . . . . . . . . .102.4.1, 715.3
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .721.0
Material . . . . . . . . . . . . . . . . . .Table 701.2, 715.1, 720.0
Sizing . . . . . . . . . . . . .710.5, 717.0, Table 717.1, C 304.2 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .723.0 BUILDING SUPPLY . . . . . . . . . . . . . . . . . .204.0, Chapter 6 BURRED ENDS . . . . . . . . . . . . . . . . .309.3, 609.1, 701.3.1,
903.3, 1208.5.7, 1321.7.2
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