Onslow County, North Carolina · Jacksonville
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Pipes freeze in Onslow County on about 3 nights a year, mostly January. Older homes, 8% of the stock here, are most at risk.
Basements flood here mostly in August. Onslow County averages 14.8 days a year with an inch of rain or more.
Sewage backups in Onslow County spike on heavy-rain days, about 14.8 a year, when sewer mains fill up and water finds the lowest drain.
Roof leaks here come from summer downpours and, with about 36 freeze-thaw days a year, from winter ice dams. Most show up as ceiling stains in the room below.
3% of occupied homes in Onslow County heat mainly with wood or propane, below the North Carolina county median of 11.7%.
With 112 muggy nights a year, mold in Onslow County can appear within days of a leak. Dry first, then clean.
Local risk profile
Onslow County covers 762 square miles of southeast North Carolina, with about 207,906 residents and 87,354 homes. Jacksonville is the county seat; Piney Green, Half Moon and Holly Ridge are the next largest communities. Much of its housing is recent, with a median build year of 1998.
43/100 Water Damage Risk Index: Moderate Onslow County ranks 73 of 100 North Carolina counties. See the statewide ranking and method.The three factors where Onslow County ranks highest compared with other North Carolina counties.
Winters here are on the gentler end for North Carolina, and pipes still freeze. It averaged 36 freezing nights a year over 2015–2024, 3 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 74th.
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 22 and end around Mar 19.
Heavy rain is a bigger factor here than in most of North Carolina. Of roughly 59 inches of yearly precipitation, the damage comes from the 14.8 days a year with an inch or more, ranked 13th of 100. July, August and September see the most. The single wettest day in the record: 8.4 inches, September 15, 2018. The worst three-day stretch dropped 16.39 inches, ending September 16, 2018, the kind of soaking that overwhelms sump pumps and storm sewers.
The temperature crosses 32°F in both directions on roughly 36 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
North Carolina's 100 counties range widely in housing age; Onslow ranks 88th, with 26% of its homes built before 1980.
Since 2000 the county has added enough housing that 48% of homes are that new. Modern PEX and copper rarely fail on their own; the leaks come from connections, appliances and storms.
About 27% of homes went up between 1980 and 1999. Some houses from the late 1970s to the mid-1990s were plumbed with polybutylene, a gray plastic pipe known for failing at fittings. A plumber can tell you in a few minutes whether you have it.
Manufactured and mobile homes make up 12% of the housing here. Water lines in the underbelly depend on intact skirting and working heat tape, and they're usually the first to freeze in a cold snap.
Renters occupy 36% 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 112 times a year here, above the North Carolina county median of 88.5. 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 expectMain heating fuel in Onslow County's occupied homes: 4% utility gas, 92% electric, 3% propane and under 1% wood. Most homes here heat with gas or electricity, so cooking and electrical faults are the likelier fire sources. Even a contained kitchen fire can send soot through the ductwork to every room.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Onslow County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Onslow gets more pipe-freeze nights than any of its neighbors. Jones County has the oldest housing nearby, with 42% of homes built before 1980.
By the numbers
| Factor | Onslow | North Carolina median | Rank |
|---|---|---|---|
| Homes built before 1960 | 8% | 18% | 94 of 100 |
| Homes built before 1980 | 26% | 41% | 88 of 100 |
| Homes built 2000 or later | 48% | 26% | 7 of 100 |
| Manufactured or mobile homes | 12% | 17% | 80 of 100 |
| Vacant homes | 14% | 13% | 47 of 100 |
| Wood or propane heat | 2.8% | 12% | 94 of 100 |
| Nights at 20°F or colder | 3/yr | 5/yr | 74 of 100 |
| Days with 1 inch+ of rain | 15/yr | 12/yr | 13 of 100 |
| Freeze-thaw days | 36/yr | 57/yr | 90 of 100 |
| Muggy nights (65°F+) | 112/yr | 89/yr | 11 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 Onslow County: freezing from January, heavy rain in July, August 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