Sevier County is the busiest short-term rental market in Tennessee — Gatlinburg, Pigeon Forge, thousands of cabins sleeping ten, twelve, twenty people. You would expect that to have produced a set of special septic rules for high-occupancy rentals. It has not. Sevier County’s short-term rental program is run by the Fire Marshal and contains no septic provisions at all.
What Sevier County does instead is price by design flow. A large cabin is not a special category; it is simply a bigger system, and the plan review fee scales with gallons. That is the mechanism worth understanding before you budget, and Sevier publishes its full fee schedule — which many Tennessee counties do not.
The Cabin Rule That Does Not Exist
We went looking for it specifically, because it is the obvious thing to expect in this county. Here is what we found instead.
Sevier County’s Short-Term Rental Unit Permit Program is administered by the Sevier County Fire Marshal’s Office. Its published material — the realtor information document revised November 8, 2024, and the program presentation — covers fire and life safety: alarms, egress, electrical, structural. There is no septic, subsurface sewage disposal or wastewater content whatsoever.
The application does collect the number of sleeping rooms, but it never ties that to wastewater capacity. Occupancy affects only the fee: $250 for an occupancy of 12 or less, and for 13 or more, an additional $25 per occupant.
So how does a twenty-person cabin get sized? Through ordinary design flow under the state rule, and through the plan review fees below. Sevier handles occupancy the way the state handles it — as gallons per day — rather than as a special rental category.
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The Full Published Fee Schedule
| Item | Fee |
|---|---|
| Septic system permit | $300.00 |
| Upgrade an existing system | $300.00 |
| Repair (existing system) | $75.00 |
| Re-inspection | $100.00 |
| Inspection letter (existing system) | $100.00 |
| Site evaluation (garage, pool, deck, outbuilding) | $50.00 |
| Subdivision evaluation | $75.00 per lot (plus $75 per existing home) |
| Existing system evaluation | $75.00 per system |
| Water sample | $100.00 |
| 🎯 Plan review, large conventional design | $650.00 first 1,000 gallons, +$150.00 per additional 1,000 |
| Alternative system | $325.00 first 1,000 gallons, +$150.00 per additional 1,000 |
| Experimental system (construction or upgrade) | $475.00 |
| Low pressure pipe | $50.00 |
| Composting toilet | $200.00 |
| Installer permit (per year) | $200.00 |
| Pumper permit (per year) | $200.00 |
| Late fee | $50.00 |
Two features deserve attention.
The plan review tiers are where cabin economics live. A conventional design starts at $650 and adds $150 per additional 1,000 gallons of design flow. A large multi-bedroom rental generates a lot of design flow, so plan review alone can exceed the permit fee several times over. Note also that the alternative track starts lower, at $325 — so on a constrained site an alternative system can be cheaper to review than a large conventional one, even though the equipment costs more. Worth asking your designer to price both routes.
The repair-versus-permit gap is four to one. $75 to repair against $300 for a new system or an upgrade. As always, whether work is classified as a repair or a replacement is worth establishing before it is done, not after.
⚠️ The schedule is filed as a 2024 document but states no effective date, so confirm the amounts by phone before relying on them. One date the county does publish: the $100 re-inspection fee for failed final inspections is effective June 1, 2024. No variance fee and no operating-permit fee appear on the schedule.
Why Sevier County Permits Its Own Systems
Sevier is one of nine Tennessee contract counties — with Blount, Davidson, Hamilton, Jefferson, Knox, Madison, Shelby and Williamson — that permit septic systems themselves rather than through TDEC, under Tenn. Code Ann. § 68-221-403(a)(10).
Their standards, under § 68-221-403(a)(10)(B), “must be at least as stringent as those of the state law and regulations.” Stricter is permitted; more lenient is not. In Sevier’s case, unlike Shelby’s two-acre minimum or Williamson’s 40-section county code, we found no standalone county septic regulation adding requirements beyond the state rule. What Sevier publishes is procedural and fee-based. That is a genuinely useful thing to know: the substance here is the state rule, 0400-48-01, applied by a county office.
Where to Apply
| Office | Sevier County Health Department, Division of Environmental Health |
| Address | 227 Cedar Street, Sevierville, TN 37862 |
| Phone | 865.429.1766 |
| Hours | Monday to Friday, 8:00 a.m. to 4:30 p.m. |
| Processing | Allow three weeks for a new application |
| Online | Applications via mgoconnect.org, as of March 4, 2024 |
What We Could Not Verify
- An effective date for the fee schedule. Filed as a 2024 document, no date stated on it.
- Any county regulation stricter than the state rule. We found none. That is an absence of findable published material, not proof that no local requirement exists — ask the office.
- The standard applied at subdivision review. The county charges $75 per lot for a subdivision evaluation, which implies a lot-by-lot soil review at platting, but no rule text setting the standard was found.
- Any septic-to-sewer or homeowner assistance program. None published by the county or by the utility districts serving it.
- Any count of septic systems in the county or permits issued per year. Not published; we will not estimate one.
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Tell us where the property is, how many bedrooms, and whether it will be a rental. Design flow is what drives the cost here, so occupancy matters — not because of a rental rule, but because of gallons.
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Frequently Asked Questions
How much does a septic permit cost in Sevier County?
A septic system permit is $300, and upgrading an existing system is also $300. A repair to an existing system is $75. Re-inspections and inspection letters are $100 each, a site evaluation for a garage, pool, deck or outbuilding is $50, and a water sample is $100. Installer and pumper permits are $200 a year each, and there is a $50 late fee. The schedule is filed as a 2024 document but states no effective date, so confirm by phone. One date the county does publish is that the $100 re-inspection fee for failed final inspections took effect June 1, 2024.
Are there special septic rules for rental cabins in Sevier County?
No, and this surprises people. Sevier County s Short-Term Rental Unit Permit Program is run by the Fire Marshal s Office and contains no septic, subsurface sewage disposal or wastewater provisions at all. It covers fire and life safety. The application records the number of sleeping rooms but never ties that to wastewater capacity, and occupancy affects only the fee, which is $250 for an occupancy of 12 or fewer plus $25 per occupant from 13 upward. Large cabins are sized through ordinary design flow under the state rule. The Tennessee county that does attach a septic inspection to short-term rentals is Hamilton County, which charges $205 for one.
Why is plan review so expensive for a large cabin?
Because it is priced by design flow. Plan review for a large conventional design is $650 for the first 1,000 gallons plus $150 for each additional 1,000 gallons. A big multi-bedroom rental generates a lot of design flow, so plan review alone can cost several times the $300 permit. Worth knowing: the alternative system track starts lower, at $325 for the first 1,000 gallons plus the same $150 per additional 1,000. On a constrained site an alternative system can therefore be cheaper to review than a large conventional one, even though the equipment costs more. Ask your designer to price both routes. An experimental system is $475.
Who issues septic permits in Sevier County?
The Sevier County Health Department, Division of Environmental Health, at 227 Cedar Street, Sevierville, TN 37862, phone 865.429.1766, open Monday to Friday 8:00 a.m. to 4:30 p.m. Allow three weeks for a new application. Applications are filed online through mgoconnect.org as of March 4, 2024. Sevier is one of nine Tennessee contract counties that permit their own systems rather than routing through TDEC, under Tenn. Code Ann. section 68-221-403(a)(10).
Does Sevier County have septic rules stricter than the state?
We found none. Unlike Shelby County with its two-acre minimum, or Williamson County with its own 40-section code, Sevier publishes procedural and fee material only, and no standalone county septic regulation adding requirements beyond Rule 0400-48-01 could be located. So the substantive rules that apply to you are the state ones. Two caveats. First, that is an absence of findable published material rather than proof no local requirement exists, so ask the office about your parcel. Second, the county charges $75 per lot for subdivision evaluation, which implies a lot-by-lot soil review at platting, though no rule text setting the standard was found.
Is there any financial help with a septic system in Sevier County?
None is published, either by the county or by the utility districts serving it. That is different from saying no help exists, but we could not find a homeowner grant, loan or conversion program. Note that under a contract county arrangement the county sets its own fees, so the amounts above are Sevier County figures and not TDEC ones. If a repair rather than a replacement will solve your problem, the $75 repair fee against $300 for a new system is the largest single saving available, so establish which category the work falls into before it starts.