The purpose of regulating the design, installation, and maintenance of septic systems (onsite wastewater treatment systems) is to prevent public health nuisance conditions caused by failing onsite wastewater treatment systems. The program's goals are:
- Ensure that these systems can operate in all weather conditions with minimal maintenance
- Prevent the contamination of groundwater from improperly designed onsite wastewater treatment systems
- Prevent the contamination of surface water from improperly designed onsite wastewater treatment systems
- Prevent premature failure of onsite wastewater treatment systems
Program Services | Contact Us| Useful Information | Types of Systems
Update on Assembly Bill 885
September 30, 2011
The State Water Resources Control Board has completed a draft State Policy for Water Quality Control for Siting, Design, Operation and Management of Onsite Wastewater Treatment Systems (OWTS Policy) and a Substitute Environmental Document (SED) for public review. Staff workshops are planned to gather input from public agencies and interested persons on the content and scope of the OWTS Policy and associated SED. Please select the links below for more information.
AB 885 - Final Draft Water Quality Control Policy for Siting, Design, Operation and Maintenance of Onsite Wastewater Treatment Systems March 20, 2012
AB 885 – Onsite Wastewater Treatment System Policy Preliminary Substitute Environmental Document March 20, 2012
AB 885 – Public Notice and Staff Workshops
Program Services
- Design review of new onsite wastewater treatment systems and Graywater Systems
- Design review of repairs and modifications to existing on-site wastewater treatment systems
- Installation inspections of onsite wastewater treatment systems
- Maintain design records for properties using onsite wastewater treatment systems
- Respond to citizen complaints of failing onsite wastewater treatment systems
- Provide coordinated review with other agencies for projects that require CEQA (California Environmental Quality Act) and involve the use of onsite wastewater treatment systems
Types of Systems
Currently DEH is approving only conventional system designs that consist of a septic tank going to either leach lines or seepage pits.
- Septic tanks must have IAPMO approval and be approved for use by DEH.
- Leach lines can be constructed with either rock and pipe or other approved materials that would include plastic chambers
- Horizontal seepage pits are restricted to sites with uniform soil conditions and average percolation rates not exceeding 30 minutes per inch.
- Vertical seepage pits are restricted to coastal sedimentary basins that have degraded groundwater caused by salt water intrusion.
- Mound systems are allowed in the areas within the former Valley Center Moratorium area, and the South Citrus Avenue basin area where engineering demonstrates the site conditions are suitable.
- Advanced treatment systems are currently considered experimental systems and are restricted to repairs where a conventional repair is not feasible.
Useful Information
Fees
Frequently Asked Questions
Design Manual for Onsite Wastewater Systems
Guidelines/Septic System Design Criteria
Groundwater Separation Requirements
Percolation Test Form
Reservoir Setback Requirements
San Diego County Code: Onsite Wastewater System Ordinance
EPA Homeowner's Guide to Septic System Maintenance
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