Warren County, Indiana · Williamsport
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Pipes freeze in Warren County on about 38 nights a year, mostly November to March. Older homes, 34% of the stock here, are most at risk.
Basements flood here mostly in June. Warren County averages 6 days a year with an inch of rain or more.
Sewage backups in Warren County spike on heavy-rain days, about 6 a year, when sewer mains fill up and water finds the lowest drain.
Warren County's wettest day in the 2015–2024 record brought 3.5 inches, and about 90 freeze-thaw days a year mean ice dams in some winters.
59% of occupied homes in Warren County heat mainly with wood or propane, above the Indiana county median of 17%.
About 36 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
With 3,706 homes and around 8,464 residents, Warren County is 365 square miles of western Indiana. Besides Williamsport, the county seat, the biggest communities are West Lebanon, Pine Village and Green Hill. The county's median home was built in 1973.
50/100 Water Damage Risk Index: Elevated Warren County ranks 47 of 92 Indiana counties. See the statewide ranking and method.The three factors where Warren County ranks highest compared with other Indiana counties.
Warren is on the colder side of Indiana for pipes. In the 2015–2024 record the county logged about 38 nights a year at or below 20°F (11th of 92) and 117 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
The longest cold spell was straight 16 days without the temperature rising above freezing, ending in February 2021. The coldest night reached about -18°F on January 2, 2018. Burst pipes usually show up when a spell like that breaks and the ice thaws.
The freeze season here runs November to March, with January the coldest. If you travel then, leave the thermostat at 55°F or above and open sink cabinets on outside walls.
On average the first fall freeze arrives around Oct 21 and the last spring freeze around Apr 21.
Warren gets fewer downpours than most Indiana counties, but they still fill basements. About 6 days a year bring an inch or more (74th of 92), most often in June, out of 39.5 inches of total precipitation. On July 10, 2024, 3.5 inches fell in a single day. Multi-day storms matter most for basements; the wettest three days on record here totaled 4.57 inches (through December 29, 2015).
The temperature crosses 32°F in both directions on roughly 90 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
58% of homes in Warren County predate 1980, close to the Indiana county median of 58.2%, which ranks 48th of Indiana's 92 counties.
Housing age is mixed: 34% of homes are pre-1960 and 19% are 2000 or newer. Ask any plumber which era your house is from and you'll know which failures to watch for.
24% 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
About 36 nights a year in Warren County stay at 65°F or warmer, a sign of muggy summer air (51st of 92 counties). July 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 expectHeating fuel matters for fire risk. In Warren County it's 21% utility gas, 19% electric, 51% propane and 8% wood. Wood and propane heat are above the Indiana 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 Warren County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Benton gets more pipe-freeze nights than Warren. Benton County has the oldest housing nearby, with 80% of homes built before 1980.
By the numbers
| Factor | Warren | Indiana median | Rank |
|---|---|---|---|
| Homes built before 1960 | 34% | 35% | 51 of 92 |
| Homes built before 1980 | 58% | 58% | 48 of 92 |
| Homes built 2000 or later | 19% | 18% | 44 of 92 |
| Manufactured or mobile homes | 4.5% | 6.4% | 61 of 92 |
| Vacant homes | 9.4% | 9.2% | 44 of 92 |
| Wood or propane heat | 59% | 17% | 1 of 92 |
| Nights at 20°F or colder | 38/yr | 33/yr | 11 of 92 |
| Days with 1 inch+ of rain | 6/yr | 7.8/yr | 74 of 92 |
| Freeze-thaw days | 90/yr | 84/yr | 2 of 92 |
| Muggy nights (65°F+) | 36/yr | 38/yr | 51 of 92 |
Rank 1 is the highest value. Bars run from the lowest to the highest Indiana county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Warren County: freezing from November to March, heavy rain in April, June and October.
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