Harnett County, North Carolina · Lillington
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With 11% 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.
September brings the most downpours to Harnett County, part of 10 heavy-rain days a year. Check the sump first.
11% of homes here predate 1960, when clay and cast iron sewer laterals were standard. Roots and cracks in those lines are a common cause of backups.
Harnett County's wettest day in the 2015–2024 record brought 4.8 inches, and about 46 freeze-thaw days a year mean ice dams in some winters.
8% of occupied homes in Harnett County heat mainly with wood or propane, below the North Carolina county median of 11.7%.
About 98 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
With 54,902 homes and around 139,150 residents, Harnett County is 595 square miles of central North Carolina. Besides Lillington, the county seat, the biggest communities are Anderson Creek, Spout Springs and Dunn. Much of its housing is recent, with a median build year of 1997.
30/100 Water Damage Risk Index: Moderate Harnett County ranks 94 of 100 North Carolina counties. See the statewide ranking and method.The three factors where Harnett County ranks highest compared with other North Carolina counties.
Pipe-freeze risk in Harnett County sits near the middle of the state. It averaged 47 freezing nights a year over 2015–2024, 4 of them at 20°F or colder, cold enough for pipes in outside walls and crawl spaces to freeze. Among 100 North Carolina counties that's 58th.
Cold snaps are the real risk. The worst in the record lasted 3 days below freezing (ending January 2018), and the low bottomed out near 7°F on January 7, 2018.
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 17 and end around Mar 21.
Harnett gets fewer downpours than most North Carolina counties, but they still fill basements. About 10 days a year bring an inch or more (88th of 100), most often in September, out of 49.8 inches of total precipitation. On October 9, 2016, 4.8 inches fell in a single day. The worst three-day stretch dropped 10.39 inches, ending September 17, 2018, the kind of soaking that overwhelms sump pumps and storm sewers.
About 46 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
Roughly 27% of the county's housing was built before 1980. That puts Harnett among the newer housing stocks of North Carolina's 100 counties.
44% 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.
29% 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 18% 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 98 nights a year in Harnett County stay at 65°F or warmer, a sign of muggy summer air (34th of 100 counties). July 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 Harnett County's occupied homes: 7% utility gas, 83% electric, 8% 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 Harnett County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Chatham and Wake get more pipe-freeze nights than Harnett. Sampson County has the oldest housing nearby, with 40% of homes built before 1980.
By the numbers
| Factor | Harnett | North Carolina median | Rank |
|---|---|---|---|
| Homes built before 1960 | 11% | 18% | 78 of 100 |
| Homes built before 1980 | 27% | 41% | 85 of 100 |
| Homes built 2000 or later | 44% | 26% | 14 of 100 |
| Manufactured or mobile homes | 18% | 17% | 48 of 100 |
| Vacant homes | 9.2% | 13% | 82 of 100 |
| Wood or propane heat | 8.2% | 12% | 71 of 100 |
| Nights at 20°F or colder | 4/yr | 5/yr | 58 of 100 |
| Days with 1 inch+ of rain | 10/yr | 12/yr | 88 of 100 |
| Freeze-thaw days | 46/yr | 57/yr | 65 of 100 |
| Muggy nights (65°F+) | 98/yr | 89/yr | 34 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 Harnett County: freezing from January, heavy rain in July, 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