What types of septic systems are approved in San Diego County?
The Department of Environmental Health and the California Regional Water Quality Control Board consider the combination of a septic tank connected to leach lines (with gravel and pipe or plastic chambers), horizontal seepage pits, or vertical seepage pits as conventional septic system design applications. Leach lines can be installed anywhere in the county where the site meets design criteria. Vertical seepage pits are restricted to coastal sedimentary basins where groundwater is degraded by salt-water intrusion. Horizontal seepage pits are restricted to sites that have deep, permeable soil, with uniform good percolation rates. All septic system designs are required to meet the Regional Water Quality Control Board’s requirement of at least 5 feet of separation between anticipated high groundwater levels and the bottom of the disposal system. Alternative Systems, such as mounds, pressure-drip, or advanced treatment designs are considered experimental at this time in San Diego County, an
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