Butler County, Pennsylvania · Butler
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Pipes freeze in Butler County on about 38 nights a year, mostly November to March. Older homes, 30% of the stock here, are most at risk.
Basements flood here mostly in June. Butler County averages 6.4 days a year with an inch of rain or more.
30% 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.
Butler County's wettest day in the 2015–2024 record brought 3.59 inches, and about 95 freeze-thaw days a year mean ice dams in some winters.
6% of occupied homes in Butler County heat mainly with wood or propane, below the Pennsylvania county median of 10%.
About 15 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
About 197,254 people live in Butler County, 789 square miles in western Pennsylvania, in roughly 87,382 homes. Besides Butler, the county seat, the biggest communities are Homeacre-Lyndora, Shanor-Northvue and Meridian. Half the homes here were built before 1980, half after.
34/100 Water Damage Risk Index: Moderate Butler County ranks 62 of 67 Pennsylvania counties. See the statewide ranking and method.The three factors where Butler County ranks highest compared with other Pennsylvania counties.
Pipe-freeze risk in Butler County sits near the middle of the state. In the 2015–2024 record the county logged about 38 nights a year at or below 20°F (32nd of 67) and 124 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
Cold snaps are the real risk. The worst in the record lasted 14 days below freezing (ending January 2018), and the low bottomed out near -15°F on February 20, 2015.
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 Oct 24 and end around May 3.
Butler gets fewer downpours than most Pennsylvania counties, but they still fill basements. About 6.4 days a year bring an inch or more (45th of 67), most often in June, out of 46.1 inches of total precipitation. On September 10, 2018, 3.59 inches fell in a single day. The worst three-day stretch dropped 5.16 inches, ending September 11, 2018, the kind of soaking that overwhelms sump pumps and storm sewers.
The temperature crosses 32°F in both directions on roughly 95 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
Roughly 50% of the county's housing was built before 1980. That puts Butler among the newer housing stocks of Pennsylvania's 67 counties.
25% of homes were built in 2000 or later, more than in most of Pennsylvania. Newer plumbing rarely corrodes, so damage here tends to come from appliance supply lines, water heaters, sump pumps and storms.
About 25% of homes went up between 1980 and 1999. Some houses from the late 1970s to the mid-1990s were plumbed with polybutylene, a gray plastic pipe known for failing at fittings. A plumber can tell you in a few minutes whether you have it.
Beyond water
Butler County averages 15 warm, muggy nights a year (lows of 65°F or more) and gets the most rain in June. The EPA recommends keeping indoor humidity below 60%, ideally 30 to 50%. Basements can pass 60% on their own in summer, so a dehumidifier matters even without a leak, and anything wet should be dried within 24 to 48 hours.
Mold remediation: what to expectMain heating fuel in Butler County's occupied homes: 68% utility gas, 19% electric, 4% propane and 2% wood. Most homes here heat with gas or electricity, so cooking and electrical faults are the likelier fire sources. Even a contained kitchen fire can send soot through the ductwork to every room.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Butler County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Clarion, Mercer and Venango get more pipe-freeze nights than Butler. Beaver County has the oldest housing nearby, with 78% of homes built before 1980.
By the numbers
| Factor | Butler | Pennsylvania median | Rank |
|---|---|---|---|
| Homes built before 1960 | 30% | 42% | 59 of 67 |
| Homes built before 1980 | 50% | 66% | 61 of 67 |
| Homes built 2000 or later | 25% | 13% | 2 of 67 |
| Manufactured or mobile homes | 6.8% | 6.6% | 33 of 67 |
| Vacant homes | 7.5% | 12% | 52 of 67 |
| Wood or propane heat | 6.2% | 10% | 55 of 67 |
| Nights at 20°F or colder | 38/yr | 37/yr | 32 of 67 |
| Days with 1 inch+ of rain | 6.4/yr | 7/yr | 45 of 67 |
| Freeze-thaw days | 95/yr | 98/yr | 43 of 67 |
| Muggy nights (65°F+) | 15/yr | 16/yr | 36 of 67 |
Rank 1 is the highest value. Bars run from the lowest to the highest Pennsylvania county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Butler County: freezing from November to March, heavy rain in June, July and September.
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