Gwinnett County, Georgia · Lawrenceville
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With 2% of homes built before 1960 and about 3 hard-freeze nights a year, frozen and split pipes are a leading winter risk in the county.
January brings the most downpours to Gwinnett County, part of 13.5 heavy-rain days a year. Check the sump first.
2% 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.
Gwinnett County's wettest day in the 2015–2024 record brought 6.58 inches, and about 41 freeze-thaw days a year mean ice dams in some winters.
2% of occupied homes in Gwinnett County heat mainly with wood or propane, below the Georgia county median of 7.1%.
About 94 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
Gwinnett County covers 431 square miles of northwest Georgia, with about 979,864 residents and 340,962 homes. Lawrenceville is the county seat; Peachtree Corners, Duluth and Sugar Hill are the next largest communities. Much of its housing is recent, with a median build year of 1996.
46/100 Water Damage Risk Index: Elevated Gwinnett County ranks 103 of 159 Georgia counties. See the statewide ranking and method.The three factors where Gwinnett County ranks highest compared with other Georgia counties.
Gwinnett County gets more hard-freeze nights than most of Georgia. In the 2015–2024 record the county logged about 3 nights a year at or below 20°F (25th of 159) and 42 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
Most freezing nights fall from 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 20 and end around Mar 16.
Heavy rain is a bigger factor here than in most of Georgia. About 13.5 days a year bring an inch or more (33rd of 159), most often in January, out of 55.6 inches of total precipitation. On September 27, 2024, 6.58 inches fell in a single day. The worst three-day stretch dropped 9.89 inches, ending September 28, 2024, the kind of soaking that overwhelms sump pumps and storm sewers.
About 41 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 14% of the county's housing was built before 1980. That puts Gwinnett among the newer housing stocks of Georgia's 159 counties.
Growth since 2000 added 41% of today's homes. In houses that new, the weak points are washing machine hoses, ice maker lines, water heaters and sump pumps rather than the pipes in the walls.
45% 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.
Beyond water
Gwinnett County averages 94 warm, muggy nights a year (lows of 65°F or more) and gets the most rain in December. 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 expectBy main heating fuel, Gwinnett County homes break down as 61% utility gas, 36% electric, 2% propane and under 1% wood. Heating equipment, cooking and electrical failures cause most home fires nationally. Even a small kitchen fire can leave soot through the whole house, because smoke follows air currents into closets, ducts and attic space.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Gwinnett County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Forsyth gets more pipe-freeze nights than Gwinnett. DeKalb County has the oldest housing nearby, with 44% of homes built before 1980.
By the numbers
| Factor | Gwinnett | Georgia median | Rank |
|---|---|---|---|
| Homes built before 1960 | 1.8% | 15% | 158 of 159 |
| Homes built before 1980 | 14% | 38% | 154 of 159 |
| Homes built 2000 or later | 41% | 27% | 26 of 159 |
| Manufactured or mobile homes | 1.3% | 21% | 156 of 159 |
| Vacant homes | 4.1% | 14% | 157 of 159 |
| Wood or propane heat | 1.9% | 7.1% | 143 of 159 |
| Nights at 20°F or colder | 3/yr | 2/yr | 25 of 159 |
| Days with 1 inch+ of rain | 14/yr | 12/yr | 33 of 159 |
| Freeze-thaw days | 41/yr | 29/yr | 37 of 159 |
| Muggy nights (65°F+) | 94/yr | 112/yr | 132 of 159 |
Rank 1 is the highest value. Bars run from the lowest to the highest Georgia county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Gwinnett County: freezing from January, heavy rain in January, February 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