Sevier County, Tennessee
USDA's soil survey flags shrink-swell clay on 0% of Sevier County's mapped land and a shallow water table under basements on 7%, both below the national shares of 15% and 29%. 8% of the county is in drought on the October 13, 2026 Drought Monitor map.
FEMA's flood data list 63 flood losses here since 2016, 4% of them in buildings with basements. 26% of homes were built before 1980, against 50% nationally; the median home dates from 1995.
Data as of October 13, 2026 · sources
expansive clay: shrink-swell limits slab homes
high water table: limits basements
in drought, October 13, 2026
of homes built before 1980
Soil under Sevier County
| Expansive clay (limits slab homes) | 0.0% |
| High water table (limits basements) | 7.1% |
| Septic fields very limited | 82.9% |
| Clay swell (LEP, by area) | 2.3% |
| High-swell land (LEP 6%+) | 0.0% |
| Mapped soil | 374,227 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Nonaburg | 12% | n/a |
| Cataska | 10% | n/a |
| Unicoi | 7% | n/a |
| Ditney | 5% | n/a |
| Sylco | 5% | n/a |
| Dewey | 4% | 0% |
How we count · survey areas TN608 (2025-09-02), TN640 (2025-09-02)
What the numbers mean here
Rain over the 12 months to August 2026: 48.31 in, 9.11 in below the 1991-2020 average year of 57.42 in.
USDA rates 83% of the land very limited for septic absorption fields.
With shrink-swell clay on 0% and a shallow water table on 7% of the land, the soil survey points to neither problem across most of Sevier County; conditions still vary lot by lot.
Drought
8% of the county is in drought (D1 or worse) on the October 13, 2026 map. Part of the county was in drought in 42 of the last 52 weeks; the most was 100% of its area, in 7 weeks, most recently on the May 26, 2026 map.
| Category, October 13, 2026 | Share of county |
|---|---|
| D0 abnormally dry or worse | 23.4% |
| D1 moderate drought or worse | 8% |
| D2 severe or worse | 0% |
| D3 extreme or worse | 0% |
| D4 exceptional | 0% |
Flood losses since 2016
63 flood losses since 2016, $1.8 million paid. The worst year was 2019, with 28. Foundations of the buildings, where recorded: 4% basements, 30% slabs, 24% crawl spaces, 41% elevated. Median water depth outside the building: 18.5 in.
| Year | Flood losses |
|---|---|
| 2016 | 3 |
| 2017 | 1 |
| 2018 | 2 |
| 2019 | 28 |
| 2020 | 14 |
| 2021 | 1 |
| 2022 | 6 |
| 2023 | 0 |
| 2024 | 6 |
| 2025 | 1 |
| 2026 to date | 1 |
Rain
| Average year, 1991-2020 | 57.42 in |
| 12 months to August 2026 | 48.31 in (-9.11) |
| 2025 | 53.15 in (-4.27) |
| Wettest year since 1895 | 2013: 73.31 in |
| Driest year since 1895 | 2007: 35.01 in |
| Days with 1 inch or more, normal at GATLINBURG 2 SW (7 mi away) | 15 |
Homes
| Housing units | 58,967 |
| Median year built | 1995 |
| Built before 1980 | 26% |
| Built 2000 or later | 41% |
| Owner-occupied | 71% |
| Median value, owner-occupied | $299,000 |
| Single-family detached | 68% |
What repairs cost
Published ranges from cost guides, not quotes. More sources, and where they disagree.
Nearby counties
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Swain County, NC | 15 mi | 0% | 1% |
| Jefferson County, TN | 19 mi | 0% | 5% |
| Blount County, TN | 23 mi | under 1% | 5% |
| Cocke County, TN | 24 mi | 1% | 6% |
| Knox County, TN | 27 mi | 0% | 8% |
| Hamblen County, TN | 33 mi | 4% | 7% |
| Grainger County, TN | 34 mi | 2% | 3% |
| Haywood County, NC | 34 mi | 1% | 2% |
Sources: USDA SSURGO (September 2, 2025) · US Drought Monitor (October 13, 2026) · FEMA NFIP v3 (September 9, 2026) · NOAA (August 2026) · Census ACS 2020-2024. Methods · Data status