Do I Need a Permit for a Septic System in Tennessee?

Yes. Every new septic system installation in Tennessee requires a permit, and every significant repair or modification to an existing system requires one as well. This is not optional, and it is not a local county decision. Tennessee state law, through the Tennessee Department of Environment and Conservation (TDEC), mandates that all septic work be permitted and inspected before going into service. There are no exceptions for rural properties, small systems, or owner-occupied homes.

TDEC Oversight and How It Works Locally

TDEC sets the statewide rules for septic system design, installation, and permitting through the Tennessee On-Site Sewage Program. However, the permit process itself is administered locally through each county's environmental health office, which operates under the Tennessee Department of Health. In Lincoln County, septic permits go through the Lincoln County Health Department. In Giles County, through the Giles County Health Department. The same structure applies to every county in the state.

This means you submit your permit application, soil evaluation results, and system design to your county health department. They review it against TDEC requirements, approve or request revisions, and issue the permit that authorizes the installation to proceed. After installation is complete, an inspector from the county health department conducts a site inspection before the system can be covered and placed into service.

The Required Steps Before a Permit Is Issued

The permit process follows a defined sequence. Skipping or rushing any step extends the timeline. Here is what the process looks like in practice:

1. Soil evaluation and percolation test. A licensed soil scientist or septic installer evaluates the proposed drain field area. They assess soil type, depth to rock or limiting layer, depth to seasonal high water table, and conduct percolation tests at the required depth. The results determine what type of system is allowed on the property.
2. Site plan and system design. Based on the soil evaluation results and the size of the home, the installer prepares a site plan showing tank location, distribution lines, and the drain field layout with required setbacks from property lines, wells, structures, and waterways.
3. Permit application submission. The application, soil evaluation report, and site plan go to the county health department. The reviewer checks compliance with TDEC rules and either approves the permit, requests additional information, or requires design changes.
4. Permit issuance. Once approved, the permit authorizes installation to begin. Work cannot begin before the permit is in hand.
5. Installation and inspection. The system is installed by a licensed contractor. Before backfilling, the county inspector visits the site to verify the installation matches the permitted design. Once approved, the system can be covered and the site restored.
6. Final approval and documentation. After the inspection is passed, the county issues final approval. This documentation becomes part of the property record and is required for title work when the property is sold.

Typical Permit Timeline

From the time the soil evaluation is conducted to the time a permit is issued, homeowners in our area typically wait three to eight weeks. The range depends on how quickly the county health department processes applications, whether the design is straightforward or requires revisions, and workload at the local office. We recommend starting the soil evaluation and permit process as early as possible in any new construction project, because the septic permit timeline can affect the overall construction schedule.

What Happens Without a Permit

Installing a septic system without a permit in Tennessee is a violation of state law. The consequences are serious. The state or county can require the system to be excavated and removed at the owner's expense. Fines can be assessed for each day the unpermitted system remains in service. When the property is sold, title companies and lenders require documentation of a properly permitted and inspected septic system. An unpermitted system can block a sale entirely or require resolution before closing.

We have seen situations where homeowners purchased properties with unpermitted systems installed by prior owners. Resolving those situations after the fact is always more expensive and complicated than doing it correctly from the start.

Marberry Handles the Full Permit Process

Marberry Construction (TN License #77673) manages the entire permit process for every septic installation we do. We coordinate the soil evaluation, prepare or review the system design, submit the permit application to the appropriate county health department, and schedule and pass the installation inspection. Homeowners do not need to navigate the county health department on their own.

We serve Lincoln County, Giles County, Franklin County, and surrounding Tennessee counties, as well as North Alabama. Call 256-679-8665 or visit our septic installation page to get started.