Hamilton County septic permits, explained

Most of Tennessee gets its septic permits from the state. Hamilton County is different. TDEC lists it as one of nine "contract counties" (along with Blount, Davidson, Jefferson, Knox, Madison, Sevier, Shelby and Williamson) that run their own septic programs. In Hamilton County that's the Groundwater Protection section of the county's Development Services department, on Market Street in downtown Chattanooga. It follows TDEC's standards and issues permits for new systems and for changes to existing ones. Since March 11, 2024, all of its permit applications have to be submitted online.

Which application do you need?

The county's own guide matches the job to the application:

Other county fees include an inspection letter ($105), a recertification letter ($180), a short-term vacation rental septic inspection ($205), and $150 for a re-inspection once a job needs a third visit. Under the county's fee resolution, starting work that needs a permit before you have the permit doubles the fee, and it doesn't excuse you from the rest of the requirements. Fees change, so check the county's current list when you apply.

Getting the site ready

Hamilton County's forms ask for the house dimensions, bedroom count, whether there's a basement with plumbing in it, and the water supply (public or well). They also ask you to let the office know when the house site is staked. TDEC's guidance for state site visits is a good checklist anywhere:

• Mark property lines and corners, with stakes no more than 200 feet apart on long lines.
• Stake the four corners of the house or building pad, including porches, patios, garages and pools.
• Mow or bush-hog the house site and the areas to be evaluated for soil.
• Don't cut, fill or grade the area first. Tennessee's rule says an approved disposal area shouldn't be disturbed, and grading after approval means a re-evaluation.
• Have any old soil maps, surveys or site plans ready.

Who can install

Hamilton County requires installers to hold a county septic installer license, good for one year. Installers who already hold a TDEC installer permit apply and pay the fee without retesting; others must pass the county's test. The county publishes a list of its licensed installers and pumpers. Ask your contractor which licenses they hold.

Third-party permits and final inspections

Since October 1, 2024, Tennessee law (T.C.A. 68-221-403(m)) lets a property owner hire a third-party water resources engineer to prepare a permit package, or to do the final inspection, instead of waiting on the state or the contract county. A soil scientist certified by TDEC can also submit a complete permit application for a system under 750 gallons per day. Hamilton County's permit page lays out both routes. They can save time on a tight construction schedule, at the cost of paying a private professional.

After the install

Under the state process, the installer contacts the regulator for a final inspection before the system is covered, and an approved system gets a Certificate of Completion. Keep it with the house papers.

Bradley County and the Georgia side

Bradley County is not a contract county, so septic permits there go through TDEC's Division of Water Resources, which has a Chattanooga field office. TDEC applications are made online, a TDEC Environmental Scientist evaluates the site, and processing can take up to 45 days from a complete application. In Catoosa and Walker County, Georgia, permitting runs through the county board of health under Georgia Department of Public Health rules.

Good questions

Do I need a permit to repair my septic system in Hamilton County?

Yes. Tennessee requires a permit to construct, modify or repair a septic system, and Hamilton County handles that through its Repair application. The county lists the repair permit at $40.

How do I find my existing septic permit in Hamilton County?

The county's online permit portal has a document retrieval search for existing septic and building permits. If your address is not found, the Groundwater Protection office can help by email.