Marin County Regulations
State of California Regulations
AB885 – Water Quality Control Policy for Siting, Design, Operation, and Maintenance of Onsite Wastewater Treatment Systems
To determine if a property is within 600 feet of a 303(d) federal listed impaired water body, the address can be entered at OWTS Map. The map is a helpful tool to determine proximity to a water body. A more precise measurement may be required to verify the actual distance to the water body.
On September 27, 2000, Governor Gray Davis signed into law, Assembly Bill 885 that required the State Water Resources Control Board (SWRCB) to adopt standards or regulations for the permitting and operation of onsite waste water systems (OWTS). On June 19, 2012, the State Water Resources Control Board (SWRCB) approved Resolution No. 2012-0032, adopting the Water Quality Control Policy for Siting, Design, Operation, and Maintenance of Onsite Wastewater Treatment Systems (OWTS Policy). This Policy establishes a statewide, risk-based, tiered approach for the regulation and management of OWTS installations, repairs, replacements, and modifications, and sets the level of performance and protection expected from OWTS.
If the current OWTS (septic system) is functioning properly and wastewater is not surfacing, there are no immediate impacts to property owner. Even if the OWTS is malfunctioning, the Policy may not affect the property owners. Only properties that are within 600 feet of a federally-listed impaired water body (303d) will have different requirements (Tier 3) for repairs, replacement, modifications, or new OWTS. (See Tier 3 described in #9.) Properties within the county and not within 600ft to an impaired water body will only be subject to current county regulations and policies.
Performance Evaluation Guidelines
The guidelines purpose of a performance evaluation is to determine whether an existing septic system is functional and meets minimum standards of performance established by the San Francisco Regional Water Quality Control Board (RWQCB) and the County of Marin, Environmental Health Services (EHS). Please review the Performance Evaluation Guidelines which describe information on conducting a hydraulic load and dye test.