Richland County, South Carolina · Columbia
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Richland County averages 2 nights a year at 20°F or colder, mostly January, and 16% of its homes predate 1960.
Heavy rain days of an inch or more come about 10.9 times a year here, most often in January. A sump pump that hasn't run since last season is a common weak point.
Backups often follow heavy rain, which Richland County gets about 10.9 days a year, when storm water overloads sewer mains and pushes up through the lowest drain in the house.
Roof leaks here come from summer downpours and, with about 34 freeze-thaw days a year, from winter ice dams. Most show up as ceiling stains in the room below.
2% of occupied homes in Richland County heat mainly with wood or propane, below the South Carolina county median of 5.1%.
Muggy summer nights, lows of 65°F or more, come about 113 times a year in Richland County. Mold after a leak spreads fastest from June through August.
Local risk profile
With 187,611 homes and around 422,117 residents, Richland County is 757 square miles of central South Carolina. Besides Columbia, the county seat, the biggest communities are St. Andrews, Dentsville and Forest Acres. Much of its housing is recent, with a median build year of 1989.
40/100 Water Damage Risk Index: Moderate Richland County ranks 35 of 46 South Carolina counties. See the statewide ranking and method.The three factors where Richland County ranks highest compared with other South Carolina counties.
For frozen pipes, Richland County is a typical South Carolina county, which is still plenty. It averaged 35 freezing nights a year over 2015–2024, 2 of them at 20°F or colder, cold enough for pipes in outside walls and crawl spaces to freeze. Among 46 South Carolina counties that's 20th.
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 21 and the last spring freeze around Mar 14.
Richland gets fewer downpours than most South Carolina counties, but they still fill basements. About 10.9 days a year bring an inch or more (36th of 46), most often in January, out of 49 inches of total precipitation. On October 4, 2015, 5.98 inches fell in a single day. Multi-day storms matter most for basements; the wettest three days on record here totaled 12.23 inches (through October 5, 2015).
The temperature crosses 32°F in both directions on roughly 34 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
South Carolina's 46 counties range widely in housing age; Richland ranks 26th, with 38% of its homes built before 1980.
Growth since 2000 added 36% 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.
The 1980s and 1990s account for 26% 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.
Renters occupy 40% of homes. If you rent, the building is usually the landlord's to repair, but your belongings are only covered by renters insurance.
Beyond water
Summer nights that don't drop below 65°F, a good marker of humid air, come about 113 times a year here, close to the South Carolina county median of 113.5. 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 Richland County's occupied homes: 23% utility gas, 73% 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 Richland County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Fairfield, Kershaw and Newberry get more pipe-freeze nights than Richland. Newberry County has the oldest housing nearby, with 49% of homes built before 1980.
By the numbers
| Factor | Richland | South Carolina median | Rank |
|---|---|---|---|
| Homes built before 1960 | 16% | 15% | 21 of 46 |
| Homes built before 1980 | 38% | 40% | 26 of 46 |
| Homes built 2000 or later | 36% | 25% | 11 of 46 |
| Manufactured or mobile homes | 4.5% | 22% | 46 of 46 |
| Vacant homes | 11% | 16% | 38 of 46 |
| Wood or propane heat | 2.1% | 5.1% | 43 of 46 |
| Nights at 20°F or colder | 2/yr | 2/yr | 20 of 46 |
| Days with 1 inch+ of rain | 11/yr | 12/yr | 36 of 46 |
| Freeze-thaw days | 34/yr | 35/yr | 24 of 46 |
| Muggy nights (65°F+) | 113/yr | 114/yr | 24 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 Richland County: freezing from January, heavy rain in January, June and July.
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