California Code, Water Code - WAT § 13399.33

(a)(1) With regard to a discharger of storm water associated with industrial activity that fails to submit the required notice of intent to obtain coverage in accordance with Section 13399.30, impose civil liability administratively in an amount that is not less than five thousand dollars ($5,000) per year of noncompliance or fraction thereof, unless the regional board makes express findings setting forth the reasons for its failure to do so, based on the specific factors required to be considered pursuant to paragraph (2).

(2) In determining the amount of the penalty imposed under this section, the regional board shall consider the nature, circumstances, extent, and gravity of the violation, and, with respect to the violator, the ability to pay, any prior history of violations, the degree of culpability, economic benefits or savings resulting from the violation, and other matters as justice may require. These considerations shall be balanced against the need for the regulatory costs of environmental protection to be borne equally by dischargers throughout the state, and the need for predictability of enforcement when making business decisions.