CA AB355

Increases the population threshold for "publicly owned treatment works serving a small community" from 10,000 to 20,000 persons or fewer, allowing more treatment works to qualify for penalty alternatives related to mandatory minimum penalties.

Allows the State Water Resources Control Board to impose civil liability administratively for underground storage tank violations under Porter-Cologne provisions, requiring the executive director to consult with local agencies before issuing complaints.

Changes the state board's annual enforcement reporting deadline from January 1 to December 31 and requires continuous website updates of enforcement information.

Establishes that civil penalties and criminal fines collected for underground storage tank violations must be deposited into the State Water Pollution Cleanup and Abatement Account for authorized water pollution cleanup activities.