Cal. Pub. Util. Code § 16480.5

Whenever a business transaction of a public utility district furnishing electricity, gas, water service where the utility has 10,000 or more service connections, or telephone service is such that a personal appearance by a person is required by the district and the person is unable to appear at the district’s place of business during the district’s usual business hours, then the district shall provide a reasonable and convenient alternative to the person such as an appointment outside the district’s usual business hours or allowing the person to conduct the transaction by telephone, mail, or both.