Septic Services in Tennessee

Tennessee Septic Regulations

Tennessee regulates septic systems through the Tennessee Department of Environment and Conservation (TDEC), Division of Water Resources, and local county health departments. The state uses a two-tier system: conventional systems are permitted by county environmental health offices, while alternative and experimental systems require TDEC approval. All new installations require a site evaluation that includes soil morphology analysis (Tennessee eliminated percolation testing in favor of soil profile evaluation in 2009). The state mandates minimum lot sizes based on soil conditions — from 0.5 acres for excellent soils to 2+ acres for poor soils. Setbacks require 50 feet from wells, 25 feet from surface water, and 10 feet from property lines. Tennessee requires all subsurface sewage disposal system installers to be licensed by the state.

Licensing Requirements

Tennessee issues permits rather than licences for subsurface sewage disposal work, through TDEC's Division of Water Resources, and the distinction matters when reading a listing. A permit is valid statewide — the counties recorded against a firm indicate where it says it works, not where it is allowed to. An installer permit authorises installing, altering, extending or repairing a conventional septic system, including conventional substitute products. A pumping contractor permit authorises removing and disposing of domestic septage from septic tanks, holding tanks, portable toilets and similar facilities, with truck inspection required both at issue and at every renewal. Permits expire on 31 December and are renewed annually. Letting an installer permit lapse is costly: the holder returns as a new applicant and must sit the examination again, which is why an active Tennessee permit says something about continuity as well as competence.

Environmental Considerations

Tennessee's geography creates diverse septic challenges across three distinct regions. East Tennessee's Ridge and Valley province features karst limestone geology with sinkholes, caves, and underground drainage channels that can transport septic effluent directly to groundwater with minimal treatment. Middle Tennessee's Nashville Basin has thin soils over limestone bedrock, limiting drain field depth. West Tennessee's Coastal Plain has deep, well-drained soils ideal for conventional systems. The Nashville metro area's explosive suburban growth in Williamson, Wilson, and Rutherford counties has driven massive demand for new septic installations.

Credentials issued in Tennessee

What this credential permits, as the issuing authority defines it.

This site holds 316 Tennessee contractors carrying one of these credentials, read from the registers above and last checked August 20, 2026.