3109B Pool Geometry — 2025 California Building Code
California Building Code (Title 24, Part 2) · 2025 edition · updated 2026-10-19 · 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 Building Code (Title 24, Part 2) § 3109B · Effective January 1, 2026 · Official source: Building Standards Commission
3109B.1 General.¶
A pool shall conform to the appropriate criteria in Figures 31B-1 through 31B-7.
Exception: A special purpose pool may be exempted from construction standards that are not applicable to the proposed use.
3109B.2 Dimensional tolerances.¶
A construction tolerance shall be permitted on all dimensions in Figures 31B-1 through 31B-3 not to exceed 2 inches (51 mm) except that the tolerance of the water level of a pool with a nonadjustable overflow system shall not exceed 1/8 inch (3.2 mm).
3109B.3 Bottom slope break.¶
Any portion of a pool having a water depth of 4 1/2 feet (1372 mm) or less shall have a uniform slope that shall not exceed 1 foot (305 mm) of vertical in 10 feet (3050 mm) of horizontal. In pools with water depths greater than 4 1/2 feet (1372 mm) the slope shall meet the requirements in Figures 31B-1 through 31B-3. There shall be a uniform water depth along the entire base of the stairs.
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