Perry County, Illinois · Pinckneyville
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With 35% of homes built before 1960 and about 23 hard-freeze nights a year, frozen and split pipes are a leading winter risk in the county.
March brings the most downpours to Perry County, part of 11.4 heavy-rain days a year. Check the sump first.
35% 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.
Perry County's wettest day in the 2015–2024 record brought 3.33 inches, and about 70 freeze-thaw days a year mean ice dams in some winters.
17% of occupied homes in Perry County heat mainly with wood or propane, close to the Illinois county median of 16.5%.
About 72 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 20,639 people live in Perry County, 442 square miles in southern Illinois, in roughly 9,152 homes. The county seat is Pinckneyville, and Du Quoin, Tamaroa and Willisville round out the largest towns. Half the homes here were built before 1973, half after.
48/100 Water Damage Risk Index: Elevated Perry County ranks 63 of 102 Illinois counties. See the statewide ranking and method.The three factors where Perry County ranks highest compared with other Illinois counties.
Winters here are on the gentler end for Illinois, and pipes still freeze. From 2015–2024 it averaged 23 nights a year at 20°F or colder, the range where pipes in exterior walls, crawl spaces and unheated garages freeze, and 84 nights at or below 32°F. That ranks 81st of 102 counties.
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 -6°F on December 23, 2022.
Most freezing nights fall from December to February, 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 28 and end around Apr 7.
Heavy rain is a bigger factor here than in most of Illinois. The county gets about 45.8 inches of rain and melted snow a year, with 11.4 days of an inch or more (18th of 102). Those downpours cluster in March, April and September, when sump pumps and gutters are tested hardest. The wettest day on record brought 3.33 inches on August 15, 2016. The worst three-day stretch dropped 6.95 inches, ending August 16, 2016, the kind of soaking that overwhelms sump pumps and storm sewers.
Freeze-thaw days, below freezing overnight and above it by afternoon, come about 70 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
61% of homes in Perry County predate 1980, close to the Illinois county median of 65.9%, which ranks 71st of Illinois's 102 counties.
Housing age is mixed: 35% of homes are pre-1960 and 16% are 2000 or newer. Ask any plumber which era your house is from and you'll know which failures to watch for.
The 1980s and 1990s account for 23% of the county's homes. If yours is from those decades, look under the sinks and at the water heater for gray plastic pipe stamped PB, which is polybutylene and leak-prone.
Manufactured and mobile homes make up 11% 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.
With 14% of homes empty at survey time, landlords and seasonal owners should shut off the main or schedule checks in winter. An unheated vacant house is also where many policies limit freeze coverage.
Beyond water
Summer nights that don't drop below 65°F, a good marker of humid air, come about 72 times a year here, above the Illinois county median of 51. 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 Perry County's occupied homes: 41% utility gas, 41% electric, 15% 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 Perry County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Washington gets more pipe-freeze nights than Perry. Franklin County has the oldest housing nearby, with 70% of homes built before 1980.
By the numbers
| Factor | Perry | Illinois median | Rank |
|---|---|---|---|
| Homes built before 1960 | 35% | 38% | 68 of 102 |
| Homes built before 1980 | 61% | 66% | 71 of 102 |
| Homes built 2000 or later | 16% | 15% | 35 of 102 |
| Manufactured or mobile homes | 11% | 5.6% | 23 of 102 |
| Vacant homes | 14% | 11% | 23 of 102 |
| Wood or propane heat | 17% | 17% | 51 of 102 |
| Nights at 20°F or colder | 23/yr | 35/yr | 81 of 102 |
| Days with 1 inch+ of rain | 11/yr | 8.4/yr | 18 of 102 |
| Freeze-thaw days | 70/yr | 81/yr | 78 of 102 |
| Muggy nights (65°F+) | 72/yr | 51/yr | 21 of 102 |
Rank 1 is the highest value. Bars run from the lowest to the highest Illinois county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Perry County: freezing from December to February, heavy rain in March, April 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