Index — D
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
– D –
DEPARTMENT, DEFINITION . . . . . . . . . . . . . . . . . . . . . 206.0
DESIGN FLOOD ELEVATION . . . . . . . . . . . . . .206.0, 301.4
DEVELOPED LENGTH
Bar and fountain sink trap . . . . . . . . . . . . . . . . . . .801.4
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .206.0
DWV piping . . . . . . . . . . . . . . . . . . . . . .707.4, 710.13.2
Indirect waste piping . . . . . . . . . . . . . . . . . . . . . .801.3.1
Trap arm . . . . . . . . . . . . . . . . . . . .1002.2, Table 1002.2
Water supply piping . . . . . . . . . .610.9, A 104.4, A 107.2
Wet vent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .908.1
DIALYSIS WATER-DISTRIBUTION SYSTEMS . . . . . . . .614.0
DIELECTRIC INSULATORS . . . . . . . . . . . . . . . . . . . . .507.1
DISHWASHING MACHINES . . . . . . . . . . . . . . . . . . . .414.0
Air gap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .807.3 Approved standards . . . . . . . . . . . . . . . . . . . . . . .414.1 Backflow protection . . . . . . . . . . . . . . . . . . . . . . . .414.2 Discharge, drainage . . . . . . . . . . .414.3, 807.3, 1014.3.2 Drainage discharge, prohibited . . . . . . . .419.2, 1014.1.3 Drainage fixture unit (DFU) . . . . . . . . . . . . .Table 702.1 Energy efficiency . . . . . . . . . . . . . . . . . . . . . . . .L 403.1 Flexible connector length . . . . . . . . . . . . . . . . . . .604.12 Water supply fixture units (WSFU) . . . . .Table 610.3, Table A 103.1, Table C 303.2
DISINFECTED TERTIARY RECYCLED
WATER
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206.0
DISPOSAL FIELDS
Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . .1504.5
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .206.0
Groundwater . . . . . . . . . . . . . . . . . . . . . . . . . . . .1504.4
Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1504.5.3
Private sewage system . . . . . . . . . . . . . . . .Appendix H Valved zones . . . . . . . . . . . . . . . . . . . . . . . . . . . .1504.1
DOMESTIC HOT-WATER DISTRIBUTION
WATER SYSTEMS FOR HEALTH FACILITIES
AND CLINICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .613.0
DOSING TANKS . . . . . . . . . . . . . . . . . . . . . . . . . . . .H 601.8
DRAINAGE SYSTEM
Cleanouts . . . . . . . . . . . . . . . . . . . . . . . . . .707.0, 719.0 Change in direction . . . . . . . . . . . . . . . . . . . . . . . .706.0 Damage to public sewer or private sewage disposal system . . . . . . . . . . . . .305.1, 714.0 Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .206.0
Fixture units . . . . . . . . . . . . . . . . . . . . . . . . .Table 702.1
Gutters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1010.5.1
Independent systems . . . . . . . . . . . . . . . . . . . . . . .311.0 Indirect waste . . . . . . . . . . . . . . . . . . . . . . . . .Chapter 8
Joints and connections . . . . . . . . . . . . . . . . . . . . .705.0
Materials . . . . . . . . . . . . . . . . .701.2, Table 701.2, 715.0
Obstruction of flow . . . . . . . . . . . . . . . . . . . . . . . . .310.5
Piping (OSHPD) . . . . . . . . . . . . . . . . . . . . . . . . . .310.9 Sizing . . . . . . . . . . . . . . . . . .702.0, Table 702.1, 703.0, Table 703.2, 717.0, Table 717.1 Slope of piping . . . . . . . . . . . . . . . . . . . . . . . . . . .708.1 Sumps and ejectors . . . . . . . . . . . . . . . . . . . . . . . .710.0 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . .712.0, 723.0 Waste detrimental to . . . . . . . . . . . .306.0, 811.1, 1012.1 DRINKING FOUNTAINS . . . . . . . . . . . . . . . . .206.0, 415.0,
809.0, E 501.8 DUCTILE IRON PIPE . . . . . . . . . . . . . . .Table 604.1, 605.4 DURHAM SYSTEM, DEFINITION . . . . . . . . . . . . . . . .206.0
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