2019 California Standards for Accessible Design Guide (effective January 1, 2020 with July 1, 2021 amendments)

1607A.8.2 Grab bars, shower seats and dressing room bench seats.

Grab bars, shower seats and dressing room bench seat systems shall be designed to resist a single concentrated load of 250 pounds (1.11 kN) applied in any direction at any point on the grab bar or seat so as to produce the maximum load effects. [DSA-AC] See Chapter 11A, Section 1127A.4, and Chapter 11B, Sections 11B-609.8, 11B-610.4 and 11B-903.6, for grab bars, shower seats and dressing room bench seats, as applicable.