Beaver County, Pennsylvania · Beaver
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With 55% of homes built before 1960 and about 31 hard-freeze nights a year, frozen and split pipes are a leading winter risk in the county.
Basements flood here mostly in June. Beaver County averages 5.8 days a year with an inch of rain or more.
Sewage backups in Beaver County spike on heavy-rain days, about 5.8 a year, when sewer mains fill up and water finds the lowest drain.
Beaver County's wettest day in the 2015–2024 record brought 3.22 inches, and about 87 freeze-thaw days a year mean ice dams in some winters.
5% of occupied homes in Beaver County heat mainly with wood or propane, below the Pennsylvania county median of 10%.
About 21 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 79,328 homes and around 166,324 residents, Beaver County is 435 square miles of western Pennsylvania. The county seat is Beaver, and Aliquippa, Economy and Beaver Falls round out the largest towns. It has some of the oldest housing in the state: the median home went up in 1957.
49/100 Water Damage Risk Index: Elevated Beaver County ranks 35 of 67 Pennsylvania counties. See the statewide ranking and method.The three factors where Beaver County ranks highest compared with other Pennsylvania counties.
Beaver County is milder than most of Pennsylvania, but not mild enough to skip winterizing. In the 2015–2024 record the county logged about 31 nights a year at or below 20°F (48th of 67) and 112 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 -11°F on February 20, 2015.
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 29 and the last spring freeze around Apr 26.
Beaver gets fewer downpours than most Pennsylvania counties, but they still fill basements. About 5.8 days a year bring an inch or more (54th of 67), most often in June, out of 44.3 inches of total precipitation. On September 10, 2018, 3.22 inches fell in a single day. Multi-day storms matter most for basements; the wettest three days on record here totaled 4.65 inches (through September 11, 2018).
Freeze-thaw days, below freezing overnight and above it by afternoon, come about 87 times a year here. They're the main driver of ice dams and of water working its way through foundation cracks in late winter.
Housing
78% of homes in Beaver County predate 1980, above the Pennsylvania county median of 66%, which ranks 5th of Pennsylvania's 67 counties.
55% 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 21 times a year here, above the Pennsylvania county median of 16. 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 expectBy main heating fuel, Beaver County homes break down as 70% utility gas, 16% electric, 4% propane and 2% wood. Fires here are likelier to start in the kitchen or the wiring than in the furnace. After any fire, keep the HVAC off until ducts are checked, or soot will travel through the house.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Beaver County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Butler and Lawrence get more pipe-freeze nights than Beaver. Its housing is the oldest in the area by share of homes built before 1980.
By the numbers
| Factor | Beaver | Pennsylvania median | Rank |
|---|---|---|---|
| Homes built before 1960 | 55% | 42% | 7 of 67 |
| Homes built before 1980 | 78% | 66% | 5 of 67 |
| Homes built 2000 or later | 9.5% | 13% | 56 of 67 |
| Manufactured or mobile homes | 3.2% | 6.6% | 55 of 67 |
| Vacant homes | 8.9% | 12% | 46 of 67 |
| Wood or propane heat | 5% | 10% | 59 of 67 |
| Nights at 20°F or colder | 31/yr | 37/yr | 48 of 67 |
| Days with 1 inch+ of rain | 5.8/yr | 7/yr | 54 of 67 |
| Freeze-thaw days | 87/yr | 98/yr | 61 of 67 |
| Muggy nights (65°F+) | 21/yr | 16/yr | 29 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 Beaver County: freezing from November to March, heavy rain in April, June 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