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Earlier editions: 20222019

Chapter 7 — SANITARY DRAINAGE

702.2 Intermittent Flow — 2025 California Plumbing Code

California Plumbing Code (Title 24, Part 5) · 2025 edition · updated 2026-09-25 · 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) § 702.2 · Effective January 1, 2026 · Official source: Building Standards Commission

Drainage fixture units for intermittent flow into the drainage system shall be computed on the rated discharge capacity in gallons per minute (gpm) (L/s) in accordance with Table 702.2.

TABLE 702.1(1) MAXIMUM DRAINAGE FIXTURE UNITS FOR A

TRAP AND TRAP ARM*

For SI Units: 1 inch = 25 mm

*** Exception:** On self-service laundries.

TABLE 702.2

DISCHARGE CAPACITY IN GALLONS PER MINUTE FOR

INTERMITTENT FLOW ONLY*

GPM FIXTURE UNITS

Up to 71⁄2		 Equals 1 Fixture Unit

Greater than 71⁄2 to 15		 Equals 2 Fixture Units

Greater than 15 to 30		 Equals 4 Fixture Units

Greater than 30 to 50		 Equals 6 Fixture Units

For SI units: 1 gallon per minute = 0.06 L/s

  • Discharge capacity exceeding 50 gallons per minute (3.15 L/s) shall be determined by the Authority Having Jurisdiction.

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▸Contents — California Plumbing Code (Title 24, Part 5)
California Plumbing Code (Title 24, Part 5)

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