California Septic Systems
California Septic Systems: One State, Five Completely Different Soils California has roughly 1.2 to 1.3 million onsite wastewater treatment systems (OWTS) — the state’s formal term for septic systems — spread across terrain that ranges from Central Valley clay to Mojave Desert caliche to Sierra Nevada granite. No other state on this site covers this much geographic variation under a single, unified regulatory framework. That framework is the State Water Resources Control Board’s OWTS Policy, adopted in 2013, which sorts…