Wayne County, Illinois · Fairfield
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Pipes freeze in Wayne County on about 21 nights a year, mostly December to February. Older homes, 37% of the stock here, are most at risk.
Basements flood here mostly in August. Wayne County averages 11.7 days a year with an inch of rain or more.
Sewage backups in Wayne County spike on heavy-rain days, about 11.7 a year, when sewer mains fill up and water finds the lowest drain.
Roof leaks here come from summer downpours and, with about 66 freeze-thaw days a year, from winter ice dams. Most show up as ceiling stains in the room below.
34% of occupied homes in Wayne County heat mainly with wood or propane, above the Illinois county median of 16.5%.
With 72 muggy nights a year, mold in Wayne County can appear within days of a leak. Dry first, then clean.
Local risk profile
With 7,680 homes and around 15,973 residents, Wayne County is 714 square miles of southeast Illinois. Besides Fairfield, the county seat, the biggest communities are Wayne City, Cisne and Jeffersonville. Half the homes here were built before 1974, half after.
50/100 Water Damage Risk Index: Elevated Wayne County ranks 54 of 102 Illinois counties. See the statewide ranking and method.The three factors where Wayne 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 21 nights a year at 20°F or colder, the range where pipes in exterior walls, crawl spaces and unheated garages freeze, and 80 nights at or below 32°F. That ranks 87th of 102 counties.
The longest cold spell was straight 14 days without the temperature rising above freezing, ending in February 2021. The coldest night reached about -6°F on December 23, 2022. Burst pipes usually show up when a spell like that breaks and the ice thaws.
The freeze season here runs December to February, with January the coldest. If you travel then, leave the thermostat at 55°F or above and open sink cabinets on outside walls.
Freezing nights typically start around Nov 1 and end around Apr 8.
Heavy rain is a bigger factor here than in most of Illinois. The county gets about 47.6 inches of rain and melted snow a year, with 11.7 days of an inch or more (15th of 102). Those downpours cluster in March, April and August, when sump pumps and gutters are tested hardest. The wettest day on record brought 3.91 inches on September 9, 2018. The worst three-day stretch dropped 6.76 inches, ending September 9, 2018, the kind of soaking that overwhelms sump pumps and storm sewers.
The temperature crosses 32°F in both directions on roughly 66 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 58% of the county's housing was built before 1980. That puts Wayne among the newer housing stocks of Illinois's 102 counties.
Since 2000 the county has added enough housing that 21% of homes are that new. Modern PEX and copper rarely fail on their own; the leaks come from connections, appliances and storms.
21% of homes are manufactured or mobile homes, above the Illinois county median of 5.6%. Their water lines run under the floor behind the skirting, so a torn skirt or failed heat tape freezes them faster than lines in a site-built house.
Beyond water
About 72 nights a year in Wayne County stay at 65°F or warmer, a sign of muggy summer air (21st of 102 counties). July is the wettest month. 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 expectHeating fuel matters for fire risk. In Wayne County it's 39% utility gas, 25% electric, 28% propane and 6% wood. Wood and propane heat are more common here than the state median. Have chimneys swept and fuel-burning appliances serviced each fall, and keep three feet clear around stoves and space heaters.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Wayne County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Clay, Jefferson, Marion and Richland get more pipe-freeze nights than Wayne. White County has the oldest housing nearby, with 72% of homes built before 1980.
By the numbers
| Factor | Wayne | Illinois median | Rank |
|---|---|---|---|
| Homes built before 1960 | 37% | 38% | 60 of 102 |
| Homes built before 1980 | 58% | 66% | 75 of 102 |
| Homes built 2000 or later | 21% | 15% | 20 of 102 |
| Manufactured or mobile homes | 21% | 5.6% | 3 of 102 |
| Vacant homes | 11% | 11% | 52 of 102 |
| Wood or propane heat | 34% | 17% | 9 of 102 |
| Nights at 20°F or colder | 21/yr | 35/yr | 87 of 102 |
| Days with 1 inch+ of rain | 12/yr | 8.4/yr | 15 of 102 |
| Freeze-thaw days | 66/yr | 81/yr | 93 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 Wayne County: freezing from December to February, heavy rain in March, April and August.
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