Chatham County, North Carolina · Pittsboro
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With 12% of homes built before 1960 and about 5 hard-freeze nights a year, frozen and split pipes are a leading winter risk in the county.
September brings the most downpours to Chatham County, part of 9.9 heavy-rain days a year. Check the sump first.
Backups often follow heavy rain, which Chatham County gets about 9.9 days a year, when storm water overloads sewer mains and pushes up through the lowest drain in the house.
In Chatham County, 4.3 inches fell on the wettest day of the 2015–2024 record. Storms like that, and ice dams in snowy winters, cause most roof leaks.
16% of occupied homes in Chatham County heat mainly with wood or propane, above the North Carolina county median of 11.7%.
Muggy summer nights, lows of 65°F or more, come about 90 times a year in Chatham County. Mold after a leak spreads fastest from June through August.
Local risk profile
With 35,914 homes and around 80,151 residents, Chatham County is 681 square miles of northern North Carolina. Pittsboro is the county seat; Siler City, Briar Chapel and Fearrington Village are the next largest communities. Much of its housing is recent, with a median build year of 1998.
31/100 Water Damage Risk Index: Moderate Chatham County ranks 93 of 100 North Carolina counties. See the statewide ranking and method.The three factors where Chatham County ranks highest compared with other North Carolina counties.
Pipe-freeze risk in Chatham County sits near the middle of the state. In the 2015–2024 record the county logged about 5 nights a year at or below 20°F (50th of 100) and 57 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
On January 7, 2018 the low fell to about 6°F, and in the stretch ending January 2018 the county went 3 days in a row below freezing. Leaks from split pipes typically appear the day the thaw arrives.
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.
Freezing nights typically start around Nov 14 and end around Mar 26.
Chatham gets fewer downpours than most North Carolina counties, but they still fill basements. About 9.9 days a year bring an inch or more (90th of 100), most often in September, out of 49.5 inches of total precipitation. On September 17, 2018, 4.3 inches fell in a single day. The worst three-day stretch dropped 9.08 inches, ending September 17, 2018, the kind of soaking that overwhelms sump pumps and storm sewers.
Freeze-thaw days, below freezing overnight and above it by afternoon, come about 56 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
24% of homes in Chatham County predate 1980, below the North Carolina county median of 41.2%, which ranks 91st of North Carolina's 100 counties.
45% of homes were built in 2000 or later, more than in most of North Carolina. Newer plumbing rarely corrodes, so damage here tends to come from appliance supply lines, water heaters, sump pumps and storms.
31% 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.
12% of homes are manufactured or mobile homes, below the North Carolina county median of 17.4%. 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.
Beyond water
About 90 nights a year in Chatham County stay at 65°F or warmer, a sign of muggy summer air (46th of 100 counties). September is the wettest month. 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 Chatham County it's 32% utility gas, 50% electric, 14% propane and 2% wood. Wood and propane heat are more common here than the state median. Have chimneys swept and fuel-burning appliances serviced each fall, and keep three feet clear around stoves and space heaters.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Chatham County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Alamance, Durham and Orange get more pipe-freeze nights than Chatham. Alamance County has the oldest housing nearby, with 42% of homes built before 1980.
By the numbers
| Factor | Chatham | North Carolina median | Rank |
|---|---|---|---|
| Homes built before 1960 | 12% | 18% | 77 of 100 |
| Homes built before 1980 | 24% | 41% | 91 of 100 |
| Homes built 2000 or later | 45% | 26% | 11 of 100 |
| Manufactured or mobile homes | 12% | 17% | 77 of 100 |
| Vacant homes | 8.1% | 13% | 89 of 100 |
| Wood or propane heat | 16% | 12% | 38 of 100 |
| Nights at 20°F or colder | 5/yr | 5/yr | 50 of 100 |
| Days with 1 inch+ of rain | 9.9/yr | 12/yr | 90 of 100 |
| Freeze-thaw days | 56/yr | 57/yr | 51 of 100 |
| Muggy nights (65°F+) | 90/yr | 89/yr | 46 of 100 |
Rank 1 is the highest value. Bars run from the lowest to the highest North Carolina county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Chatham County: freezing from December to January, heavy rain in April, 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