Fee schedule not yet confirmed Statewide range shown until we confirm with the county
Hamilton County septic permits
Chattanooga, Soddy-Daisy, Signal Mountain, Ooltewah and the county. What the state requires, what the ground here does to the price, and what to confirm with the county before you file.
Permit costs
We haven't confirmed Hamilton County's current fee schedule. Rather than publish a number we can't stand behind, here's the statewide picture and the exact question to ask when you call.
Across Tennessee, a construction permit for a septic installation generally runs $150 to $500, set by system type. Counties publish their own schedules within that, and they differ — Sevier County, for instance, charges $300 for a new system and $75 for a repair, then bills an inspection letter and water sample at $100 each on top.
When you call Hamilton County Environmental Health, ask for four figures specifically:
- New septic construction permit
- Repair permit — usually much cheaper, and often the right filing
- Inspection letter — this is what a lender will ask for at closing
- Re-inspection fee, and how re-scheduling works if an inspection fails
Ask whether they take cards. Several East Tennessee county offices still require payment by mail, which quietly adds days to a schedule that may be tied to a closing date.
The filing that saves the most money
A repair permit costs a fraction of a new-system permit almost everywhere in the state. If the work replaces a failed component of an existing system rather than installing a new one, it should be filed as a repair. Contractors sometimes default to the new-system filing because it carries fewer questions. Ask which one went in, and why.
Approval has to come before the work
A construction permit must be issued before anything is dug. Applications filed after a system is in the ground get rejected, and correcting that can mean excavating a finished installation. If a contractor offers to start while the paperwork catches up, that is your signal to get another quote.
Check the installer's permit, not just their licence
Two separate things are at play. You pull a construction permit through the county. Your contractor must separately hold an installer permit from TDEC — $200 for conventional systems, plus $100 for each alternative system type they're approved for, such as low pressure pipe, mound, oxidation lagoon or aerobic treatment.
Mountain lots around Chattanooga frequently require mound or treatment-unit designs. Confirm the installer holds the matching TDEC alternative permit before work is scheduled.
What the ground here does to the price
Hamilton County is ridge-and-valley country, and the two halves of that name behave very differently. Valley floors around Ooltewah and the Chattanooga basin often take a conventional gravity field. Ridge and mountain lots — Signal Mountain, Lookout Mountain, the slopes above Soddy-Daisy — hit shallow rock quickly, and shallow rock is what turns a $15,000 job into a $30,000 one. Nothing about the house changes; the ground decides.
| Scope | Cost |
|---|---|
| Complete system replacement | $15,000–30,000 |
| Tank-only replacement | $3,000–8,000 |
| Conventional gravity system | $12,000–20,000 |
| Mound system | $20,000–35,000 |
| Perc test | $300–800 |
Tank size is set by bedroom count rather than bathrooms, and Tennessee regulations fix the minimums. A four-bedroom house needs a larger tank than a three-bedroom one with the same square footage, and no contractor can size below the minimum and pass inspection.
Nearby counties
Fee schedules and ground conditions change at the county line, sometimes sharply. If your property sits near a boundary, check the neighbouring sheet too.