Seneca County, Ohio · Tiffin
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Pipes freeze in Seneca County on about 33 nights a year, mostly November to March. Older homes, 51% of the stock here, are most at risk.
Basements flood here mostly in June. Seneca County averages 3.6 days a year with an inch of rain or more.
Backups often follow heavy rain, which Seneca County gets about 3.6 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 80 freeze-thaw days a year, from winter ice dams. Most show up as ceiling stains in the room below.
20% of occupied homes in Seneca County heat mainly with wood or propane, above the Ohio county median of 15.9%.
About 34 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
Seneca County covers 551 square miles of northern Ohio, with about 54,770 residents and 23,982 homes. Besides Tiffin, the county seat, the biggest communities are Fostoria, Attica and Bloomville. It has some of the oldest housing in the state: the median home went up in 1959.
57/100 Water Damage Risk Index: Elevated Seneca County ranks 26 of 88 Ohio counties. See the statewide ranking and method.The three factors where Seneca County ranks highest compared with other Ohio counties.
Seneca is on the colder side of Ohio for pipes. From 2015–2024 it averaged 33 nights a year at 20°F or colder, the range where pipes in exterior walls, crawl spaces and unheated garages freeze, and 108 nights at or below 32°F. That ranks 27th of 88 counties.
The longest cold spell was straight 18 days without the temperature rising above freezing, ending in March 2015. The coldest night reached about -10°F on February 20, 2015. Burst pipes usually show up when a spell like that breaks and the ice thaws.
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.
On average the first fall freeze arrives around Nov 2 and the last spring freeze around Apr 23.
Seneca gets fewer downpours than most Ohio counties, but they still fill basements. The county gets about 37.1 inches of rain and melted snow a year, with 3.6 days of an inch or more (82nd of 88). Those downpours cluster in June, July and November, when sump pumps and gutters are tested hardest. The wettest day on record brought 3.54 inches on August 24, 2023. Multi-day storms matter most for basements; the wettest three days on record here totaled 4.24 inches (through August 25, 2023).
The temperature crosses 32°F in both directions on roughly 80 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
76% of homes in Seneca County predate 1980, above the Ohio county median of 61.1%, which ranks 6th of Ohio's 88 counties.
51% were built before 1960. Homes from that era often still have galvanized steel supply pipe, which rusts from the inside until it pinholes, and cast iron drains that crack with age. Slow leaks behind walls are a common start to water damage in these houses.
Beyond water
Summer nights that don't drop below 65°F, a good marker of humid air, come about 34 times a year here, close to the Ohio county median of 35. 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 Seneca County's occupied homes: 52% utility gas, 24% electric, 17% 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 Seneca County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Crawford and Huron get more pipe-freeze nights than Seneca. Crawford County has the oldest housing nearby, with 80% of homes built before 1980.
By the numbers
| Factor | Seneca | Ohio median | Rank |
|---|---|---|---|
| Homes built before 1960 | 51% | 37% | 4 of 88 |
| Homes built before 1980 | 76% | 61% | 6 of 88 |
| Homes built 2000 or later | 9% | 17% | 82 of 88 |
| Manufactured or mobile homes | 4.2% | 5.9% | 56 of 88 |
| Vacant homes | 7.1% | 8.4% | 55 of 88 |
| Wood or propane heat | 20% | 16% | 31 of 88 |
| Nights at 20°F or colder | 33/yr | 31/yr | 27 of 88 |
| Days with 1 inch+ of rain | 3.6/yr | 5.7/yr | 82 of 88 |
| Freeze-thaw days | 80/yr | 82/yr | 55 of 88 |
| Muggy nights (65°F+) | 34/yr | 35/yr | 49 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 Seneca County: freezing from November to March, heavy rain in June, July and November.
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