Calhoun County, Illinois · Hardin
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Pipes freeze in Calhoun County on about 30 nights a year, mostly November to February. Older homes, 42% of the stock here, are most at risk.
Basements flood here mostly in July. Calhoun County averages 8.7 days a year with an inch of rain or more.
Sewage backups in Calhoun County spike on heavy-rain days, about 8.7 a year, when sewer mains fill up and water finds the lowest drain.
Roof leaks here come from summer downpours and, with about 74 freeze-thaw days a year, from winter ice dams. Most show up as ceiling stains in the room below.
57% of occupied homes in Calhoun County heat mainly with wood or propane, above the Illinois county median of 16.5%.
Muggy summer nights, lows of 65°F or more, come about 67 times a year in Calhoun County. Mold after a leak spreads fastest from June through August.
Local risk profile
With 2,300 homes and around 4,330 residents, Calhoun County is 254 square miles of western Illinois. Besides Hardin, the county seat, the biggest communities are Kampsville, Batchtown and Brussels. Half the homes here were built before 1968, half after.
52/100 Water Damage Risk Index: Elevated Calhoun County ranks 40 of 102 Illinois counties. See the statewide ranking and method.The three factors where Calhoun County ranks highest compared with other Illinois counties.
Pipe-freeze risk in Calhoun County sits near the middle of the state. In the 2015–2024 record the county logged about 30 nights a year at or below 20°F (64th of 102) and 94 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 -10°F on January 15, 2024.
Most freezing nights fall from November 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 25 and end around Apr 10.
Rainfall is about average for Illinois. About 8.7 days a year bring an inch or more (47th of 102), most often in July, out of 41 inches of total precipitation. On December 27, 2015, 3.7 inches fell in a single day. The worst three-day stretch dropped 6.36 inches, ending December 29, 2015, the kind of soaking that overwhelms sump pumps and storm sewers.
About 74 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
62% of homes in Calhoun County predate 1980, close to the Illinois county median of 65.9%, which ranks 65th of Illinois's 102 counties.
Older and newer homes sit side by side here: 42% predate 1960 and 16% are from 2000 or later. Corroded pipe is the typical failure in the first group, burst supply hoses in the second.
11% 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.
The Census counted 46% of homes as vacant, above the Illinois county median of 10.8%. Empty houses are where a small leak turns into a large claim, because nobody is there to hear it.
Beyond water
Calhoun County averages 67 warm, muggy nights a year (lows of 65°F or more) and gets the most rain in July. 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 expectHeating fuel matters for fire risk. In Calhoun County it's 22% utility gas, 21% electric, 49% propane and 8% wood. Wood and propane heat are above the Illinois norm. Annual chimney and vent inspection, which the NFPA recommends, is one of the most effective fire-prevention habits for these homes.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Calhoun County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Greene and Pike get more pipe-freeze nights than Calhoun. Greene County has the oldest housing nearby, with 76% of homes built before 1980.
By the numbers
| Factor | Calhoun | Illinois median | Rank |
|---|---|---|---|
| Homes built before 1960 | 42% | 38% | 44 of 102 |
| Homes built before 1980 | 62% | 66% | 65 of 102 |
| Homes built 2000 or later | 16% | 15% | 38 of 102 |
| Manufactured or mobile homes | 11% | 5.6% | 26 of 102 |
| Vacant homes | 46% | 11% | 1 of 102 |
| Wood or propane heat | 57% | 17% | 1 of 102 |
| Nights at 20°F or colder | 30/yr | 35/yr | 64 of 102 |
| Days with 1 inch+ of rain | 8.7/yr | 8.4/yr | 47 of 102 |
| Freeze-thaw days | 74/yr | 81/yr | 67 of 102 |
| Muggy nights (65°F+) | 67/yr | 51/yr | 30 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 Calhoun County: freezing from November to February, heavy rain in April, July 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