Greenville County, South Carolina · Greenville
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With 13% of homes built before 1960 and about 4 hard-freeze nights a year, frozen and split pipes are a leading winter risk in the county.
Basements flood here mostly in October. Greenville County averages 15.1 days a year with an inch of rain or more.
Sewage backups in Greenville County spike on heavy-rain days, about 15.1 a year, when sewer mains fill up and water finds the lowest drain.
Greenville County's wettest day in the 2015–2024 record brought 6.29 inches, and about 47 freeze-thaw days a year mean ice dams in some winters.
3% of occupied homes in Greenville County heat mainly with wood or propane, below the South Carolina county median of 5.1%.
With 94 muggy nights a year, mold in Greenville County can appear within days of a leak. Dry first, then clean.
Local risk profile
About 548,166 people live in Greenville County, 786 square miles in northwest South Carolina, in roughly 238,260 homes. Greenville is the county seat; Greer, Mauldin and Simpsonville are the next largest communities. Much of its housing is recent, with a median build year of 1992.
62/100 Water Damage Risk Index: Elevated Greenville County ranks 6 of 46 South Carolina counties. See the statewide ranking and method.The three factors where Greenville County ranks highest compared with other South Carolina counties.
Greenville 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 48 nights at or below 32°F. That ranks 2nd of 46 counties.
Expect the hardest freezes in January, inside a season that runs January. That's when an outdoor spigot left connected to a hose, or a pipe in a crawl space, is most likely to split.
On average the first fall freeze arrives around Nov 18 and the last spring freeze around Mar 19.
Heavy rain is a bigger factor here than in most of South Carolina. The county gets about 57 inches of rain and melted snow a year, with 15.1 days of an inch or more (3rd of 46). Those downpours cluster in May, October and December, when sump pumps and gutters are tested hardest. The wettest day on record brought 6.29 inches on September 27, 2024. Multi-day storms matter most for basements; the wettest three days on record here totaled 9.63 inches (through September 28, 2024).
About 47 days a year swing from below freezing at night to above freezing by day. Those freeze-thaw cycles feed ice dams on roofs, open cracks in foundations and driveways, and stress pipes that are already marginal.
Housing
South Carolina's 46 counties range widely in housing age; Greenville ranks 31st, with 35% of its homes built before 1980.
Growth since 2000 added 38% of today's homes. In houses that new, the weak points are washing machine hoses, ice maker lines, water heaters and sump pumps rather than the pipes in the walls.
About 27% of homes went up between 1980 and 1999. Some houses from the late 1970s to the mid-1990s were plumbed with polybutylene, a gray plastic pipe known for failing at fittings. A plumber can tell you in a few minutes whether you have it.
Manufactured and mobile homes make up 7% of the housing here. Water lines in the underbelly depend on intact skirting and working heat tape, and they're usually the first to freeze in a cold snap.
Beyond water
Summer nights that don't drop below 65°F, a good marker of humid air, come about 94 times a year here, below the South Carolina county median of 113.5. Mold grows when indoor humidity stays above about 60%, the EPA's ceiling. A basement dehumidifier set to 50% and drying anything wet within 24 to 48 hours prevents most problems.
Mold remediation: what to expectHeating fuel matters for fire risk. In Greenville County it's 38% utility gas, 57% electric, 2% propane and under 1% wood. Heating equipment, cooking and electrical failures cause most home fires nationally. Even a small kitchen fire can leave soot through the whole house, because smoke follows air currents into closets, ducts and attic space.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Greenville County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Greenville gets more pipe-freeze nights than any of its neighbors. Laurens County has the oldest housing nearby, with 43% of homes built before 1980.
By the numbers
| Factor | Greenville | South Carolina median | Rank |
|---|---|---|---|
| Homes built before 1960 | 13% | 15% | 33 of 46 |
| Homes built before 1980 | 35% | 40% | 31 of 46 |
| Homes built 2000 or later | 38% | 25% | 9 of 46 |
| Manufactured or mobile homes | 7.3% | 22% | 44 of 46 |
| Vacant homes | 7.4% | 16% | 43 of 46 |
| Wood or propane heat | 2.9% | 5.1% | 39 of 46 |
| Nights at 20°F or colder | 4/yr | 2/yr | 2 of 46 |
| Days with 1 inch+ of rain | 15/yr | 12/yr | 3 of 46 |
| Freeze-thaw days | 47/yr | 35/yr | 9 of 46 |
| Muggy nights (65°F+) | 94/yr | 114/yr | 41 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 Greenville County: freezing from January, 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