Cal. WAT § 13308

(a) If the regional board determines there is a threatened or continuing violation of any cleanup or abatement order, cease and desist order, or any order issued under Section 13267 or 13383, the regional board may issue an order establishing a time schedule and prescribing a civil penalty which shall become due if compliance is not achieved in accordance with that time schedule.

(b) The amount of the civil penalty shall be based upon the amount reasonably necessary to achieve compliance, and may not include any amount intended to punish or redress previous violations. The amount of the penalty may not exceed ten thousand dollars ($10,000) for each day in which the violation occurs.

(c) Any person who fails to achieve compliance in accordance with the schedule established in an order issued pursuant to subdivision (a) shall be liable civilly in an amount not to exceed the amount prescribed by the order. The regional board may impose the penalty administratively in accordance with Article 2.5 (commencing with Section 13323). If the regional board imposes the penalty in an amount less than the amount prescribed in the order issued pursuant to subdivision (a), the regional board shall make express findings setting forth the reasons for its action based on the specific factors required to be considered pursuant to Section 13327.

(d) The state board may exercise the powers of a regional board under this section if the violation or threatened violation involves requirements prescribed by an order issued by the state board.

(e) Funds collected pursuant to this section shall be deposited in the State Water Pollution Cleanup and Abatement Account.

(f) Civil liability may be imposed pursuant to this section only if civil liability is not imposed pursuant to Section 13261, 13265, 13268, 13350, or 13385.