Septic Tank Companies in Missouri
199 septic service companies across 123 cities — approximately 30% of Missouri homes use septic systems
Missouri's onsite wastewater systems are regulated by the Missouri Department of Health and Senior Services (DHSS) under 19 CSR 20-3 (Onsite Sewage Disposal), with permitting handled by county-level or regional administrative authorities. Missouri's geology is split between the glacially flattened northern plains (with deep, fertile loess and clay soils) and the Ozark Plateau in the southern half of the state, characterized by karst limestone, caves, springs, and sinkholes that make septic system siting especially critical. The state is home to over 6,400 known caves and some of the largest springs in North America, including Big Spring and Greer Spring in the Current River watershed, making groundwater protection from onsite systems a paramount concern.