Piatt County, Illinois · Monticello
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With 33% of homes built before 1960 and about 35 hard-freeze nights a year, frozen and split pipes are a leading winter risk in the county.
July brings the most downpours to Piatt County, part of 6.3 heavy-rain days a year. Check the sump first.
33% 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.
Piatt County's wettest day in the 2015–2024 record brought 2.99 inches, and about 82 freeze-thaw days a year mean ice dams in some winters.
13% of occupied homes in Piatt County heat mainly with wood or propane, below the Illinois county median of 16.5%.
With 47 muggy nights a year, mold in Piatt County can appear within days of a leak. Dry first, then clean.
Local risk profile
Piatt County covers 439 square miles of eastern Illinois, with about 16,695 residents and 7,412 homes. Monticello is the county seat; Bement, Cerro Gordo and Mansfield are the next largest communities. Half the homes here were built before 1973, half after.
30/100 Water Damage Risk Index: Moderate Piatt County ranks 100 of 102 Illinois counties. See the statewide ranking and method.The three factors where Piatt County ranks highest compared with other Illinois counties.
Pipe-freeze risk in Piatt County sits near the middle of the state. From 2015–2024 it averaged 35 nights a year at 20°F or colder, the range where pipes in exterior walls, crawl spaces and unheated garages freeze, and 107 nights at or below 32°F. That ranks 51st of 102 counties.
The longest cold spell was straight 15 days without the temperature rising above freezing, ending in February 2021. The coldest night reached about -15°F on January 30, 2019. Burst pipes usually show up when a spell like that breaks and the ice thaws.
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.
Freezing nights typically start around Oct 24 and end around Apr 19.
Piatt gets fewer downpours than most Illinois counties, but they still fill basements. The county gets about 39.8 inches of rain and melted snow a year, with 6.3 days of an inch or more (95th of 102). Those downpours cluster in June, July and August, when sump pumps and gutters are tested hardest. The wettest day on record brought 2.99 inches on July 10, 2024. The worst three-day stretch dropped 5.23 inches, ending December 29, 2015, the kind of soaking that overwhelms sump pumps and storm sewers.
Freeze-thaw days, below freezing overnight and above it by afternoon, come about 82 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
Roughly 63% of the county's housing was built before 1980. That puts Piatt near the middle of Illinois's 102 counties.
Older and newer homes sit side by side here: 33% predate 1960 and 17% are from 2000 or later. Corroded pipe is the typical failure in the first group, burst supply hoses in the second.
Beyond water
Summer nights that don't drop below 65°F, a good marker of humid air, come about 47 times a year here, close to 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 expectHeating fuel matters for fire risk. In Piatt County it's 66% utility gas, 20% electric, 12% propane and under 1% 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 Piatt County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Champaign, De Witt and McLean get more pipe-freeze nights than Piatt. De Witt County has the oldest housing nearby, with 76% of homes built before 1980.
By the numbers
| Factor | Piatt | Illinois median | Rank |
|---|---|---|---|
| Homes built before 1960 | 33% | 38% | 76 of 102 |
| Homes built before 1980 | 63% | 66% | 60 of 102 |
| Homes built 2000 or later | 17% | 15% | 29 of 102 |
| Manufactured or mobile homes | 1.6% | 5.6% | 92 of 102 |
| Vacant homes | 6.6% | 11% | 90 of 102 |
| Wood or propane heat | 13% | 17% | 69 of 102 |
| Nights at 20°F or colder | 35/yr | 35/yr | 51 of 102 |
| Days with 1 inch+ of rain | 6.3/yr | 8.4/yr | 95 of 102 |
| Freeze-thaw days | 82/yr | 81/yr | 40 of 102 |
| Muggy nights (65°F+) | 47/yr | 51/yr | 63 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 Piatt County: freezing from November to March, heavy rain in June, 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