After appliances are connected, the piping system shall be pressurized to not less than ten (10) inches nor more than fourteen (14) inches water column and the appliance connections tested for leakage with soapy water or bubble solution.
Cal. Code Regs. Tit. 25, § 4520.2
Note: Authority cited: Section 18015, Health and Safety Code. Reference: Section 18025, Health and Safety Code.