Unicoi County, Tennessee · Erwin
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With 26% of homes built before 1960 and about 19 hard-freeze nights a year, frozen and split pipes are a leading winter risk in the county.
Heavy rain days of an inch or more come about 8 times a year here, most often in October. A sump pump that hasn't run since last season is a common weak point.
26% of homes here predate 1960, when clay and cast iron sewer laterals were standard. Roots and cracks in those lines are a common cause of backups.
In Unicoi County, 3.06 inches fell on the wettest day of the 2015–2024 record. Storms like that, and ice dams in snowy winters, cause most roof leaks.
11% of occupied homes in Unicoi County heat mainly with wood or propane, above the Tennessee county median of 7.8%.
With 8 muggy nights a year, mold in Unicoi County can appear within days of a leak. Dry first, then clean.
Local risk profile
With 8,749 homes and around 17,756 residents, Unicoi County is 186 square miles of northeast Tennessee. Besides Erwin, the county seat, the biggest communities are Unicoi and Banner Hill. The county's median home was built in 1977.
58/100 Water Damage Risk Index: Elevated Unicoi County ranks 29 of 95 Tennessee counties. See the statewide ranking and method.The three factors where Unicoi County ranks highest compared with other Tennessee counties.
Unicoi is on the colder side of Tennessee for pipes. From 2015–2024 it averaged 19 nights a year at 20°F or colder, the range where pipes in exterior walls, crawl spaces and unheated garages freeze, and 90 nights at or below 32°F. That ranks 2nd of 95 counties.
The longest cold spell was straight 8 days without the temperature rising above freezing, ending in January 2018. The coldest night reached about -6°F on February 20, 2015. Burst pipes usually show up when a spell like that breaks and the ice thaws.
The freeze season here runs November to February, with January the coldest. If you travel then, leave the thermostat at 55°F or above and open sink cabinets on outside walls.
On average the first fall freeze arrives around Oct 28 and the last spring freeze around Apr 20.
Unicoi gets fewer downpours than most Tennessee counties, but they still fill basements. Of roughly 53.1 inches of yearly precipitation, the damage comes from the 8 days a year with an inch or more, ranked 92nd of 95. May, October and December see the most. The single wettest day in the record: 3.06 inches, September 26, 2024. Multi-day storms matter most for basements; the wettest three days on record here totaled 6.28 inches (through September 28, 2024).
The temperature crosses 32°F in both directions on roughly 82 days a year. Each cycle melts and refreezes water at roof edges and in foundation cracks, which is how ice dams and basement seepage get started.
Housing
Tennessee's 95 counties range widely in housing age; Unicoi ranks 4th, with 57% of its homes built before 1980.
Before 1960 is when 26% of these homes went up. Galvanized supply lines and cast iron drains were standard then, and after 60-plus years both corrode and crack, often out of sight inside a wall or under a slab.
The 1980s and 1990s account for 29% of the county's homes. If yours is from those decades, look under the sinks and at the water heater for gray plastic pipe stamped PB, which is polybutylene and leak-prone.
20% of homes are manufactured or mobile homes, above the Tennessee county median of 15.9%. Their water lines run under the floor behind the skirting, so a torn skirt or failed heat tape freezes them faster than lines in a site-built house.
Beyond water
Summer nights that don't drop below 65°F, a good marker of humid air, come about 8 times a year here, below the Tennessee county median of 74. The EPA recommends keeping indoor humidity below 60%, ideally 30 to 50%. Basements can pass 60% on their own in summer, so a dehumidifier matters even without a leak, and anything wet should be dried within 24 to 48 hours.
Mold remediation: what to expectMain heating fuel in Unicoi County's occupied homes: 33% utility gas, 55% electric, 6% propane and 5% wood. Wood heat is more common here than in most Tennessee counties. Heating equipment is one of the leading causes of home fires nationally, and the NFPA recommends having chimneys and vents inspected every year.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Unicoi County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Unicoi gets more pipe-freeze nights than any of its neighbors. Its housing is the oldest in the area by share of homes built before 1980.
By the numbers
| Factor | Unicoi | Tennessee median | Rank |
|---|---|---|---|
| Homes built before 1960 | 26% | 16% | 9 of 95 |
| Homes built before 1980 | 57% | 41% | 4 of 95 |
| Homes built 2000 or later | 15% | 27% | 94 of 95 |
| Manufactured or mobile homes | 20% | 16% | 32 of 95 |
| Vacant homes | 11% | 12% | 55 of 95 |
| Wood or propane heat | 11% | 7.8% | 36 of 95 |
| Nights at 20°F or colder | 19/yr | 11/yr | 2 of 95 |
| Days with 1 inch+ of rain | 8/yr | 14/yr | 92 of 95 |
| Freeze-thaw days | 82/yr | 60/yr | 3 of 95 |
| Muggy nights (65°F+) | 8/yr | 74/yr | 93 of 95 |
Rank 1 is the highest value. Bars run from the lowest to the highest Tennessee county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Unicoi County: freezing from November to February, heavy rain in May, October and December.
Sources: U.S. Census Bureau, ACS 2024 5-year estimates (2020-2024); weather from NOAA nClimGrid-Daily county averages (EpiNOAA), 2015–2024, averaged across the county; county boundaries from Census TIGER. Reviewed 2026-10-21. Methodology