California Septic Regulations

California regulates on-site wastewater treatment systems (OWTS) through the State Water Resources Control Board and Regional Water Quality Control Boards. Local agencies (counties and cities) implement permitting and enforcement.

Permits

OWTS permits are issued by local counties or Regional Water Quality Control Boards. The state OWTS Policy (effective 2013) sets baseline requirements, while local agencies may adopt more stringent standards. New and replacement systems require permits.

Inspections

Inspections are required at installation and may be required during property transfers depending on the county. Systems near impaired water bodies are subject to additional monitoring. Some counties require periodic inspections every 3-5 years.

Regulatory authority

California State Water Resources Control Board

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