Putnam County, Ohio · Ottawa
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Putnam County averages 33 nights a year at 20°F or colder, mostly November to March, and 37% of its homes predate 1960.
Heavy rain days of an inch or more come about 4.4 times a year here, most often in July. A sump pump that hasn't run since last season is a common weak point.
Backups often follow heavy rain, which Putnam County gets about 4.4 days a year, when storm water overloads sewer mains and pushes up through the lowest drain in the house.
Roof leaks here come from summer downpours and, with about 79 freeze-thaw days a year, from winter ice dams. Most show up as ceiling stains in the room below.
33% of occupied homes in Putnam County heat mainly with wood or propane, above the Ohio county median of 15.9%.
Muggy summer nights, lows of 65°F or more, come about 41 times a year in Putnam County. Mold after a leak spreads fastest from June through August.
Local risk profile
About 34,314 people live in Putnam County, 483 square miles in northwest Ohio, in roughly 13,884 homes. The county seat is Ottawa, and Leipsic, Pandora and Columbus Grove round out the largest towns. The county's median home was built in 1972.
52/100 Water Damage Risk Index: Elevated Putnam County ranks 41 of 88 Ohio counties. See the statewide ranking and method.The three factors where Putnam County ranks highest compared with other Ohio counties.
Putnam is on the colder side of Ohio for pipes. In the 2015–2024 record the county logged about 33 nights a year at or below 20°F (27th of 88) and 107 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
On January 31, 2019 the low fell to about -12°F, and in the stretch ending March 2015 the county went 19 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.
On average the first fall freeze arrives around Oct 31 and the last spring freeze around Apr 20.
Putnam gets fewer downpours than most Ohio counties, but they still fill basements. About 4.4 days a year bring an inch or more (70th of 88), most often in July, out of 38.5 inches of total precipitation. On June 27, 2015, 2.29 inches fell in a single day. Multi-day storms matter most for basements; the wettest three days on record here totaled 4.01 inches (through June 28, 2015).
About 79 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
Ohio's 88 counties range widely in housing age; Putnam ranks 44th, with 61% of its homes built before 1980.
Housing age is mixed: 37% of homes are pre-1960 and 14% are 2000 or newer. Ask any plumber which era your house is from and you'll know which failures to watch for.
The 1980s and 1990s account for 24% 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
About 41 nights a year in Putnam County stay at 65°F or warmer, a sign of muggy summer air (19th of 88 counties). May is the wettest month. 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, Putnam County homes break down as 32% utility gas, 31% electric, 30% propane and 3% wood. Propane heat is 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 Putnam County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Defiance, Paulding and Van Wert get more pipe-freeze nights than Putnam. Allen County has the oldest housing nearby, with 73% of homes built before 1980.
By the numbers
| Factor | Putnam | Ohio median | Rank |
|---|---|---|---|
| Homes built before 1960 | 37% | 37% | 44 of 88 |
| Homes built before 1980 | 61% | 61% | 44 of 88 |
| Homes built 2000 or later | 14% | 17% | 55 of 88 |
| Manufactured or mobile homes | 3.6% | 5.9% | 64 of 88 |
| Vacant homes | 5.3% | 8.4% | 76 of 88 |
| Wood or propane heat | 33% | 16% | 2 of 88 |
| Nights at 20°F or colder | 33/yr | 31/yr | 27 of 88 |
| Days with 1 inch+ of rain | 4.4/yr | 5.7/yr | 70 of 88 |
| Freeze-thaw days | 79/yr | 82/yr | 64 of 88 |
| Muggy nights (65°F+) | 41/yr | 35/yr | 19 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 Putnam County: freezing from November to March, heavy rain in May, June 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