Armstrong County, Pennsylvania · Kittanning
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With 51% of homes built before 1960 and about 38 hard-freeze nights a year, frozen and split pipes are a leading winter risk in the county.
Heavy rain days of an inch or more come about 6.6 times a year here, most often in August. A sump pump that hasn't run since last season is a common weak point.
51% 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.
In Armstrong County, 3.84 inches fell on the wettest day of the 2015–2024 record. Storms like that, and ice dams in snowy winters, cause most roof leaks.
7% of occupied homes in Armstrong County heat mainly with wood or propane, below the Pennsylvania county median of 10%.
Muggy summer nights, lows of 65°F or more, come about 15 times a year in Armstrong County. Mold after a leak spreads fastest from June through August.
Local risk profile
Armstrong County covers 653 square miles of western Pennsylvania, with about 64,622 residents and 32,128 homes. Kittanning is the county seat; Ford City, Leechburg and Freeport are the next largest communities. It has some of the oldest housing in the state: the median home went up in 1959.
55/100 Water Damage Risk Index: Elevated Armstrong County ranks 23 of 67 Pennsylvania counties. See the statewide ranking and method.The three factors where Armstrong County ranks highest compared with other Pennsylvania counties.
For frozen pipes, Armstrong County is a typical Pennsylvania county, which is still plenty. It averaged 125 freezing nights a year over 2015–2024, 38 of them at 20°F or colder, cold enough for pipes in outside walls and crawl spaces to freeze. Among 67 Pennsylvania counties that's 32nd.
Cold snaps are the real risk. The worst in the record lasted 17 days below freezing (ending March 2015), and the low bottomed out near -16°F on February 20, 2015.
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 Oct 24 and the last spring freeze around Apr 30.
Rainfall is about average for Pennsylvania. The county gets about 48.5 inches of rain and melted snow a year, with 6.6 days of an inch or more (42nd of 67). Those downpours cluster in April, August and September, when sump pumps and gutters are tested hardest. The wettest day on record brought 3.84 inches on September 10, 2018. Multi-day storms matter most for basements; the wettest three days on record here totaled 6.11 inches (through September 11, 2018).
About 98 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
Pennsylvania's 67 counties range widely in housing age; Armstrong ranks 19th, with 73% of its homes built before 1980.
In Armstrong County 51% of homes are older than 1960. If yours is one of them and the plumbing has never been replaced, expect galvanized steel supply pipe and cast iron drain lines, the two materials most likely to fail quietly.
Manufactured and mobile homes make up 10% of the housing here. Water lines in the underbelly depend on intact skirting and working heat tape, and they're usually the first to freeze in a cold snap.
Beyond water
About 15 nights a year in Armstrong County stay at 65°F or warmer, a sign of muggy summer air (36th of 67 counties). June 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 expectMain heating fuel in Armstrong County's occupied homes: 74% utility gas, 11% electric, 5% 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 Armstrong County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Clarion, Indiana and Jefferson get more pipe-freeze nights than Armstrong. Its housing is the oldest in the area by share of homes built before 1980.
By the numbers
| Factor | Armstrong | Pennsylvania median | Rank |
|---|---|---|---|
| Homes built before 1960 | 51% | 42% | 16 of 67 |
| Homes built before 1980 | 73% | 66% | 19 of 67 |
| Homes built 2000 or later | 9.5% | 13% | 56 of 67 |
| Manufactured or mobile homes | 9.5% | 6.6% | 18 of 67 |
| Vacant homes | 13% | 12% | 30 of 67 |
| Wood or propane heat | 7.2% | 10% | 49 of 67 |
| Nights at 20°F or colder | 38/yr | 37/yr | 32 of 67 |
| Days with 1 inch+ of rain | 6.6/yr | 7/yr | 42 of 67 |
| Freeze-thaw days | 98/yr | 98/yr | 33 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 Armstrong County: freezing from November to March, heavy rain in April, August 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