721.1 Building Sewer — 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) § 721.1 · Effective January 1, 2026 · Official source: Building Standards Commission
Except as provided in Section 721.2, no building sewer shall be located in a lot other than the lot that is the site of the building or structure served by such sewer nor shall a building sewer be located at a point having less than the minimum distances referenced in Table 721.1.
TABLE 721.1
MINIMUM HORIZONTAL DISTANCE REQUIRED FROM BUILDING SEWER (feet)
| Buildings or structures1 | 2 |
|---|---|
Property line adjoining private property |
Clear2 |
| Water supply wells | 503 |
Streams |
50 |
On-site domestic water service line |
14 |
Public water main |
105, 6 |
For SI units: 1 foot = 304.8 mm
Notes: 1 Including porches and steps, whether covered or uncovered; breezeways; roofed porte-cochere; roofed patios; carports; covered walks; covered driveways; and similar structures or appurtenances. 2 See also Section 312.3. 3 Drainage piping shall clear domestic water supply wells by not less than 50 feet (15 240 mm). This distance shall be permitted to be reduced to not less than 25 feet (7620 mm) where the drainage piping is constructed of materials approved for use within a building. 4 See Section 720.0. 5 For parallel construction. 6 For crossings, approval by the Health Department or the Authority Having Jurisdiction shall be required.
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