Real septic system costs, county by county.

Most septic cost guides treat each state as one market. Soil and bedrock vary block by block — and so does the bill. We dig into county health department records and licensed-installer pricing to give you a real number for your county.

Find your cost by county

We cover 86 counties across three states, with more added each month.

Tennessee

30 counties covered. Valley & Ridge karst makes installs highly variable.

North Carolina

31 counties covered. Mountain karst, Piedmont clay, and coastal sands.

Kentucky

25 counties covered. Bluegrass karst plus Eastern Kentucky rural sites.

What does a septic system actually cost?

Costs vary widely by system type and site conditions. National averages don't help when your specific lot has limestone 18 inches down. Browse our cost guides by service:

Septic installation cost
$5,200 – $22,000+ depending on system type Drain field replacement cost
$6,500 – $22,000 for full replacement Septic pumping cost
$325 – $650 every 3–5 years Septic inspection cost
$300 – $650 for real estate transactions