Oconee County, South Carolina · Walhalla
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Oconee County averages 4 nights a year at 20°F or colder, mostly December to January, and 12% of its homes predate 1960.
Heavy rain days of an inch or more come about 15.8 times a year here, most often in January. A sump pump that hasn't run since last season is a common weak point.
12% 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 Oconee County, 6.14 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 Oconee County heat mainly with wood or propane, above the South Carolina county median of 5.1%.
About 83 nights a year here stay at 65°F or warmer, so basements and crawl spaces can grow mold even without a leak.
Local risk profile
With 42,100 homes and around 80,469 residents, Oconee County is 627 square miles of northwest South Carolina. The county seat is Walhalla, and Seneca, Keowee Key and Westminster round out the largest towns. Much of its housing is recent, with a median build year of 1990.
60/100 Water Damage Risk Index: Elevated Oconee County ranks 10 of 46 South Carolina counties. See the statewide ranking and method.The three factors where Oconee County ranks highest compared with other South Carolina counties.
Oconee is on the colder side of South Carolina for pipes. From 2015–2024 it averaged 4 nights a year at 20°F or colder, the range where pipes in exterior walls, crawl spaces and unheated garages freeze, and 53 nights at or below 32°F. That ranks 2nd of 46 counties.
Most freezing nights fall from December to January, peaking in January. Disconnect garden hoses and shut off outdoor spigots before the first hard frost, and keep the heat at 55°F or higher if you'll be away.
On average the first fall freeze arrives around Nov 13 and the last spring freeze around Mar 24.
Heavy rain is a bigger factor here than in most of South Carolina. About 15.8 days a year bring an inch or more (1st of 46), most often in January, out of 62 inches of total precipitation. On September 27, 2024, 6.14 inches fell in a single day. Multi-day storms matter most for basements; the wettest three days on record here totaled 10.54 inches (through September 27, 2024).
Freeze-thaw days, below freezing overnight and above it by afternoon, come about 53 times a year here. They're the main driver of ice dams and of water working its way through foundation cracks in late winter.
Housing
Roughly 35% of the county's housing was built before 1980. That puts Oconee among the newer housing stocks of South Carolina's 46 counties.
32% of homes were built in 2000 or later, more than in most of South Carolina. Newer plumbing rarely corrodes, so damage here tends to come from appliance supply lines, water heaters, sump pumps and storms.
33% date from 1980 to 1999, the window when polybutylene, a gray flexible plastic supply pipe, was used in some homes. It's prone to leaks at the fittings, so it's worth checking for in a house from those years.
Here 20% of housing is manufactured homes. Check the skirting and the heat tape on the main water line every fall, because that one exposed line is what freezes.
The Census counted 18% of homes as vacant, above the South Carolina county median of 15.5%. Empty houses are where a small leak turns into a large claim, because nobody is there to hear it.
Beyond water
About 83 nights a year in Oconee County stay at 65°F or warmer, a sign of muggy summer air (46th of 46 counties). December is the wettest month. 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 expectHeating fuel matters for fire risk. In Oconee County it's 18% utility gas, 69% electric, 9% propane and 2% wood. Wood and propane heat are above the South Carolina norm. Annual chimney and vent inspection, which the NFPA recommends, is one of the most effective fire-prevention habits for these homes.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Oconee County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Oconee gets more pipe-freeze nights than any of its neighbors. It also has the most heavy-rain days in its area. Anderson County has the oldest housing nearby, with 40% of homes built before 1980.
By the numbers
| Factor | Oconee | South Carolina median | Rank |
|---|---|---|---|
| Homes built before 1960 | 12% | 15% | 35 of 46 |
| Homes built before 1980 | 35% | 40% | 31 of 46 |
| Homes built 2000 or later | 32% | 25% | 16 of 46 |
| Manufactured or mobile homes | 20% | 22% | 27 of 46 |
| Vacant homes | 18% | 16% | 14 of 46 |
| Wood or propane heat | 11% | 5.1% | 7 of 46 |
| Nights at 20°F or colder | 4/yr | 2/yr | 2 of 46 |
| Days with 1 inch+ of rain | 16/yr | 12/yr | 1 of 46 |
| Freeze-thaw days | 53/yr | 35/yr | 3 of 46 |
| Muggy nights (65°F+) | 83/yr | 114/yr | 46 of 46 |
Rank 1 is the highest value. Bars run from the lowest to the highest South Carolina county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Oconee County: freezing from December to January, heavy rain in January, April 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