Adams County, Ohio · West Union
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Pipes freeze in Adams County on about 27 nights a year, mostly November to March. Older homes, 29% of the stock here, are most at risk.
Basements flood here mostly in February. Adams County averages 9.1 days a year with an inch of rain or more.
29% 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.
Adams County's wettest day in the 2015–2024 record brought 3.23 inches, and about 86 freeze-thaw days a year mean ice dams in some winters.
28% of occupied homes in Adams County heat mainly with wood or propane, above the Ohio county median of 15.9%.
With 37 muggy nights a year, mold in Adams County can appear within days of a leak. Dry first, then clean.
Local risk profile
With 12,733 homes and around 27,540 residents, Adams County is 584 square miles of southwest Ohio. West Union is the county seat; Manchester, Peebles and Winchester are the next largest communities. Half the homes here were built before 1981, half after.
45/100 Water Damage Risk Index: Elevated Adams County ranks 54 of 88 Ohio counties. See the statewide ranking and method.The three factors where Adams County ranks highest compared with other Ohio counties.
Winters here are on the gentler end for Ohio, and pipes still freeze. From 2015–2024 it averaged 27 nights a year at 20°F or colder, the range where pipes in exterior walls, crawl spaces and unheated garages freeze, and 100 nights at or below 32°F. That ranks 73rd of 88 counties.
Cold snaps are the real risk. The worst in the record lasted 13 days below freezing (ending January 2018), and the low bottomed out near -12°F on February 20, 2015.
Expect the hardest freezes in January, inside a season that runs November to March. 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 Oct 27 and end around Apr 20.
Heavy rain is a bigger factor here than in most of Ohio. About 9.1 days a year bring an inch or more (4th of 88), most often in February, out of 48.8 inches of total precipitation. On September 9, 2018, 3.23 inches fell in a single day. The worst three-day stretch dropped 5.32 inches, ending September 10, 2018, the kind of soaking that overwhelms sump pumps and storm sewers.
The temperature crosses 32°F in both directions on roughly 86 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
48% of homes in Adams County predate 1980, below the Ohio county median of 61.1%, which ranks 78th of Ohio's 88 counties.
23% of homes were built in 2000 or later, more than in most of Ohio. 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.
Manufactured and mobile homes make up 20% 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.
With 18% of homes empty at survey time, landlords and seasonal owners should shut off the main or schedule checks in winter. An unheated vacant house is also where many policies limit freeze coverage.
Beyond water
About 37 nights a year in Adams County stay at 65°F or warmer, a sign of muggy summer air (32nd of 88 counties). July 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 Adams County it's 12% utility gas, 57% electric, 20% propane and 8% wood. Wood and propane heat are above the Ohio norm. Annual chimney and vent inspection, which the NFPA recommends, is one of the most effective fire-prevention habits for these homes.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Adams County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Brown and Highland get more pipe-freeze nights than Adams. Scioto County has the oldest housing nearby, with 66% of homes built before 1980.
By the numbers
| Factor | Adams | Ohio median | Rank |
|---|---|---|---|
| Homes built before 1960 | 29% | 37% | 67 of 88 |
| Homes built before 1980 | 48% | 61% | 78 of 88 |
| Homes built 2000 or later | 23% | 17% | 16 of 88 |
| Manufactured or mobile homes | 20% | 5.9% | 4 of 88 |
| Vacant homes | 18% | 8.4% | 6 of 88 |
| Wood or propane heat | 28% | 16% | 8 of 88 |
| Nights at 20°F or colder | 27/yr | 31/yr | 73 of 88 |
| Days with 1 inch+ of rain | 9.1/yr | 5.7/yr | 4 of 88 |
| Freeze-thaw days | 86/yr | 82/yr | 20 of 88 |
| Muggy nights (65°F+) | 37/yr | 35/yr | 32 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 Adams County: freezing from November to March, heavy rain in February, March and April.
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