Septic Tank Companies in Indiana
251 septic service companies across 147 cities — approximately 30% of Indiana homes use septic systems
Indiana's septic systems are regulated by the Indiana State Department of Health (ISDH) under 410 IAC 6-8.3 (the Residential Onsite Sewage Disposal rules), with local administration by county health departments across all 92 counties. Indiana's flat to gently rolling landscape, shaped by glacial activity, features predominantly clay-rich soils in the northern and central regions (the Tipton Till Plain) that present significant drainage challenges for conventional septic systems. The southern third of the state, including the hill country of Brown, Monroe, and Lawrence counties, has thinner soils over limestone bedrock, introducing karst concerns where untreated wastewater can quickly reach underground aquifers.