Marlboro County, South Carolina · Bennettsville
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Pipes freeze in Marlboro County on about 3 nights a year, mostly January. Older homes, 25% of the stock here, are most at risk.
Heavy rain days of an inch or more come about 10.3 times a year here, most often in September. A sump pump that hasn't run since last season is a common weak point.
Sewage backups in Marlboro County spike on heavy-rain days, about 10.3 a year, when sewer mains fill up and water finds the lowest drain.
Roof leaks here come from summer downpours and, with about 37 freeze-thaw days a year, from winter ice dams. Most show up as ceiling stains in the room below.
8% of occupied homes in Marlboro County heat mainly with wood or propane, above the South Carolina county median of 5.1%.
With 113 muggy nights a year, mold in Marlboro County can appear within days of a leak. Dry first, then clean.
Local risk profile
About 25,975 people live in Marlboro County, 480 square miles in northeast South Carolina, in roughly 12,077 homes. The county seat is Bennettsville, and McColl, Clio and Wallace round out the largest towns. Half the homes here were built before 1977, half after.
58/100 Water Damage Risk Index: Elevated Marlboro County ranks 16 of 46 South Carolina counties. See the statewide ranking and method.The three factors where Marlboro County ranks highest compared with other South Carolina counties.
Marlboro County gets more hard-freeze nights than most of South Carolina. In the 2015–2024 record the county logged about 3 nights a year at or below 20°F (7th of 46) and 38 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
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.
Freezing nights typically start around Nov 20 and end around Mar 18.
Marlboro gets fewer downpours than most South Carolina counties, but they still fill basements. About 10.3 days a year bring an inch or more (41st of 46), most often in September, out of 49.1 inches of total precipitation. On September 16, 2018, 7.34 inches fell in a single day. The worst three-day stretch dropped 15.19 inches, ending September 17, 2018, the kind of soaking that overwhelms sump pumps and storm sewers.
The temperature crosses 32°F in both directions on roughly 37 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
Roughly 56% of the county's housing was built before 1980. That puts Marlboro among the oldest housing stocks of South Carolina's 46 counties.
25% were built before 1960. Homes from that era often still have galvanized steel supply pipe, which rusts from the inside until it pinholes, and cast iron drains that crack with age. Slow leaks behind walls are a common start to water damage in these houses.
32% 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.
26% of homes are manufactured or mobile homes, above the South Carolina county median of 22%. 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.
The Census counted 19% 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.
Renters occupy 37% 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
Marlboro County averages 113 warm, muggy nights a year (lows of 65°F or more) and gets the most rain in September. Keep indoor humidity under 60%, as the EPA advises, and dry any leak within 24 to 48 hours; in a humid month a wet basement left alone won't dry by itself.
Mold remediation: what to expectHeating fuel matters for fire risk. In Marlboro County it's 16% utility gas, 75% electric, 7% propane and 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 Marlboro County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Marlboro gets more pipe-freeze nights than any of its neighbors. All of its neighbors see more heavy-rain days. Its housing is the oldest in the area by share of homes built before 1980.
By the numbers
| Factor | Marlboro | South Carolina median | Rank |
|---|---|---|---|
| Homes built before 1960 | 25% | 15% | 6 of 46 |
| Homes built before 1980 | 56% | 40% | 2 of 46 |
| Homes built 2000 or later | 12% | 25% | 45 of 46 |
| Manufactured or mobile homes | 26% | 22% | 16 of 46 |
| Vacant homes | 19% | 16% | 10 of 46 |
| Wood or propane heat | 7.9% | 5.1% | 18 of 46 |
| Nights at 20°F or colder | 3/yr | 2/yr | 7 of 46 |
| Days with 1 inch+ of rain | 10/yr | 12/yr | 41 of 46 |
| Freeze-thaw days | 37/yr | 35/yr | 20 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 Marlboro County: freezing from January, heavy rain in January, May and September.
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