Dorchester County, South Carolina · St. George
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With 4% of homes built before 1960 and about 1 hard-freeze night a year, frozen and split pipes are a leading winter risk in the county.
August brings the most downpours to Dorchester County, part of 11.7 heavy-rain days a year. Check the sump first.
Sewage backups in Dorchester County spike on heavy-rain days, about 11.7 a year, when sewer mains fill up and water finds the lowest drain.
Dorchester County's wettest day in the 2015–2024 record brought 9.29 inches, and about 22 freeze-thaw days a year mean ice dams in some winters.
2% of occupied homes in Dorchester County heat mainly with wood or propane, below the South Carolina county median of 5.1%.
About 128 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
About 167,201 people live in Dorchester County, 568 square miles in southern South Carolina, in roughly 67,865 homes. St. George is the county seat; North Charleston, Summerville and Ridgeville are the next largest communities. Much of its housing is recent, with a median build year of 2000.
28/100 Water Damage Risk Index: Moderate Dorchester County ranks 44 of 46 South Carolina counties. See the statewide ranking and method.The three factors where Dorchester County ranks highest compared with other South Carolina counties.
Dorchester County is milder than most of South Carolina, but not mild enough to skip winterizing. It averaged 22 freezing nights a year over 2015–2024, 1 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 40th.
With only about 22 freezing nights a year, many homes here aren't built for cold, so a single arctic outbreak can burst pipes across the county. The record low in this data was about 14°F, on January 5, 2018.
Rainfall is about average for South Carolina. About 11.7 days a year bring an inch or more (27th of 46), most often in August, out of 52.4 inches of total precipitation. On October 8, 2016, 9.29 inches fell in a single day. Multi-day storms matter most for basements; the wettest three days on record here totaled 12.76 inches (through October 5, 2015).
Freeze-thaw days, below freezing overnight and above it by afternoon, come about 22 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 20% of the county's housing was built before 1980. That puts Dorchester among the newer housing stocks of South Carolina's 46 counties.
50% 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.
30% 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 12% 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.
Beyond water
About 128 nights a year in Dorchester County stay at 65°F or warmer, a sign of muggy summer air (5th of 46 counties). August 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 expectMain heating fuel in Dorchester County's occupied homes: 21% utility gas, 76% electric, 2% propane and under 1% wood. Fires here are likelier to start in the kitchen or the wiring than in the furnace. After any fire, keep the HVAC off until ducts are checked, or soot will travel through the house.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Dorchester County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Orangeburg gets more pipe-freeze nights than Dorchester. Orangeburg County has the oldest housing nearby, with 45% of homes built before 1980.
By the numbers
| Factor | Dorchester | South Carolina median | Rank |
|---|---|---|---|
| Homes built before 1960 | 4% | 15% | 44 of 46 |
| Homes built before 1980 | 20% | 40% | 42 of 46 |
| Homes built 2000 or later | 50% | 25% | 5 of 46 |
| Manufactured or mobile homes | 12% | 22% | 39 of 46 |
| Vacant homes | 6.9% | 16% | 44 of 46 |
| Wood or propane heat | 1.8% | 5.1% | 44 of 46 |
| Nights at 20°F or colder | 1/yr | 2/yr | 40 of 46 |
| Days with 1 inch+ of rain | 12/yr | 12/yr | 27 of 46 |
| Freeze-thaw days | 22/yr | 35/yr | 41 of 46 |
| Muggy nights (65°F+) | 128/yr | 114/yr | 5 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 Dorchester County: freezing from midwinter, heavy rain in August, September 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