California Code, Public Utilities Code - PUC § 755.5

(a) Notwithstanding Section 755, the commission shall allow a water corporation with 10,000 or more service connections to recover the reasonable expenses incurred by the water corporation in providing to its customers bill payment options, including credit card, debit card, and prepaid card bill payment options, and shall not require the water corporation to impose a transaction fee on its customers.

(b) The costs of the bill payment options undertaken pursuant to subdivision (a) shall not be recovered from customers participating in a water rate relief program for low-income ratepayers established pursuant to Section 739.8.

(c) The commission shall ensure that accepting bill payment options pursuant to subdivision (a) neither increases nor decreases the rate of return of the water corporation.