Clermont County, Ohio · Batavia
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With 19% of homes built before 1960 and about 24 hard-freeze nights a year, frozen and split pipes are a leading winter risk in the county.
Heavy rain days of an inch or more come about 9.6 times a year here, most often in February. A sump pump that hasn't run since last season is a common weak point.
Backups often follow heavy rain, which Clermont County gets about 9.6 days a year, when storm water overloads sewer mains and pushes up through the lowest drain in the house.
In Clermont County, 3.24 inches fell on the wettest day of the 2015–2024 record. Storms like that, and ice dams in snowy winters, cause most roof leaks.
7% of occupied homes in Clermont County heat mainly with wood or propane, below the Ohio county median of 15.9%.
Muggy summer nights, lows of 65°F or more, come about 46 times a year in Clermont County. Mold after a leak spreads fastest from June through August.
Local risk profile
About 211,181 people live in Clermont County, 453 square miles in southwest Ohio, in roughly 88,470 homes. Besides Batavia, the county seat, the biggest communities are Amelia, Withamsville and Milford. Much of its housing is recent, with a median build year of 1987.
40/100 Water Damage Risk Index: Moderate Clermont County ranks 65 of 88 Ohio counties. See the statewide ranking and method.The three factors where Clermont County ranks highest compared with other Ohio counties.
Winters here are on the gentler end for Ohio, and pipes still freeze. It averaged 94 freezing nights a year over 2015–2024, 24 of them at 20°F or colder, cold enough for pipes in outside walls and crawl spaces to freeze. Among 88 Ohio counties that's 85th.
On February 20, 2015 the low fell to about -9°F, and in the stretch ending January 2018 the county went 13 days in a row below freezing. Leaks from split pipes typically appear the day the thaw arrives.
Most freezing nights fall from November to March, 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 1 and end around Apr 18.
Heavy rain is a bigger factor here than in most of Ohio. About 9.6 days a year bring an inch or more (1st of 88), most often in February, out of 48.5 inches of total precipitation. On May 19, 2020, 3.24 inches fell in a single day. The worst three-day stretch dropped 4.56 inches, ending May 20, 2020, the kind of soaking that overwhelms sump pumps and storm sewers.
The temperature crosses 32°F in both directions on roughly 79 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
Ohio's 88 counties range widely in housing age; Clermont ranks 85th, with 41% of its homes built before 1980.
Growth since 2000 added 26% 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.
The 1980s and 1990s account for 32% of the county's homes. If yours is from those decades, look under the sinks and at the water heater for gray plastic pipe stamped PB, which is polybutylene and leak-prone.
Beyond water
Summer nights that don't drop below 65°F, a good marker of humid air, come about 46 times a year here, above the Ohio county median of 35. 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 expectMain heating fuel in Clermont County's occupied homes: 38% utility gas, 49% electric, 5% propane and 2% 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 Clermont County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Brown, Clinton and Warren get more pipe-freeze nights than Clermont. It also has the most heavy-rain days in its area. Hamilton County has the oldest housing nearby, with 73% of homes built before 1980.
By the numbers
| Factor | Clermont | Ohio median | Rank |
|---|---|---|---|
| Homes built before 1960 | 19% | 37% | 86 of 88 |
| Homes built before 1980 | 41% | 61% | 85 of 88 |
| Homes built 2000 or later | 26% | 17% | 6 of 88 |
| Manufactured or mobile homes | 5.9% | 5.9% | 44 of 88 |
| Vacant homes | 4% | 8.4% | 87 of 88 |
| Wood or propane heat | 6.8% | 16% | 71 of 88 |
| Nights at 20°F or colder | 24/yr | 31/yr | 85 of 88 |
| Days with 1 inch+ of rain | 9.6/yr | 5.7/yr | 1 of 88 |
| Freeze-thaw days | 79/yr | 82/yr | 64 of 88 |
| Muggy nights (65°F+) | 46/yr | 35/yr | 7 of 88 |
Rank 1 is the highest value. Bars run from the lowest to the highest Ohio county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Clermont County: freezing from November to March, heavy rain in February, March and July.
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