The septic permit process in Sevier and Blount County, step by step
Getting a septic permit in Sevier or Blount County, Tennessee is a county process from start to finish. Both are TDEC contract counties: the state writes the rules (TDEC Rule Chapter 0400-48-01), but the county Environmental Health office evaluates your site, issues your permit, inspects your install, and keeps your records, which are not in the statewide database. This guide walks the sequence and puts the two counties side by side, with every verified figure date-stamped and everything unverified said plainly.
The sequence, in order
- Soil and site evaluation. A county environmentalist or soil scientist maps soil depth, slope, and absorption across the parcel. The evaluation determines whether the lot supports a system, whether the design is conventional or engineered, where the field and its reserve area sit, and the bedroom count the permit will carry. Everything downstream depends on it; what it covers is detailed under septic permitting and soil evaluation.
- Construction permit application. Filed with the county office, with the state's online channel at tdec.tn.gov/septic feeding the same county intake. Engineered designs add plan review, and drip systems above 30 percent slope add a licensed engineer's stamp.
- Installation by a state-permitted installer. Tennessee requires a current TDEC SSDS Installer Permit for anyone installing, altering, extending, or repairing a system, with the Alternative class for engineered designs (LPP, mound, drip, ATU).
- Pre-cover inspection and final approval. The county inspects the open system before backfill. The approved record then lives at the county office for the life of the system.
The two counties side by side
| Item | Sevier County | Blount County |
|---|---|---|
| Office | Division of Environmental Health, 227 Cedar Street, Sevierville, TN 37862 | Department of Environmental Health, Maryville (confirm street address with the office) |
| Phone | (865) 429-1766 | (865) 681-9301 |
| Hours | Monday to Friday, 8:00am to 4:30pm | Confirm with the office |
| Construction permit fee | $300 (county 2024 fee schedule, retrieved July 18, 2026) | Not published online; call for current fees |
| Engineered plan review | $650 plus $150 per additional 1,000 gallons (same schedule) | Not published online |
| Reported timeline | Roughly three weeks, staffing dependent | Up to 45 days from a complete application (state framework) |
| Permit life | Reported three years, $100 re-inspection fee effective June 2024 | Confirm with the office |
| Services listed | Evaluations, permits, records; online intake since March 2024 | Septic permits and layouts, site evaluations, repair requests (blounttn.gov/299) |
Sources: seviercountytn.gov Environmental Health and fee schedule pages and blounttn.gov/299, both retrieved July 18, 2026. Fees and timelines change; treat the table as a snapshot and the phone numbers as the source of truth. County context beyond permitting lives on the Sevier County and Blount County pages.
What "contract county" changes in practice
- Rulings are local. Whether your parcel needs an engineered system, what your bedroom count is, whether an old permit is still valid: county answers, from county files.
- Records are local. Buying a home on septic? The system's permit and as-built record are at the county office, a quick call away, not in the state database. The due-diligence angle is covered in buying a cabin with a septic system.
- Installer verification is local. Confirm any contractor's TDEC SSDS Installer Permit, and the Alternative class for engineered work, through the county office. There is no slick statewide self-service lookup that covers contract counties.
Timing advice that saves real money
Run the evaluation before finalizing house plans on a new build, per the sequence on the new septic installation page, and before panic-quoting a replacement on an aging field. The permit windows, three weeks reported in Sevier, up to 45 days in the Blount framework, belong in any construction schedule from day one. And if the evaluation lands your lot in the engineered lane, the honest budgeting numbers are in what an engineered septic system costs on a steep lot, with the systems explained in the engineered septic systems guide.
Getting help with the process
Owners can run this process themselves, and the county offices are genuinely helpful. If you would rather have a professional sequence it, we connect you free with an independent licensed local septic contractor who files these permits every week; start on the contact page.