Cal. Bus. & Prof. Code § 12210.3

(a) A county sealer who possesses the appropriate equipment to perform tests on water submeters shall inspect, test, and certify to the accuracy of a water submeter, within his or her county and upon written request of the owner, user, or operator of the water submeter, if any of the following circumstances exist:
1. (1) The service is requested to be performed in addition to, or according to a schedule different from, any inspection frequency established by regulations adopted pursuant to Section 12212.
2. (2) The requested service pertains to a water submeter not intended to be placed into service in the county within six months.
3. (3) The requested service pertains to a water submeter intended to be placed into service in a different county.
(b) Notwithstanding Section 12210.5, the board of supervisors may authorize the sealer to establish, from time to time, a schedule of fees to cover the cost of services provided under subdivision (a) and to charge and collect the fees. The fee schedule shall be limited to the actual cost of performing those services.