Index — U
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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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
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
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