Mercer County, Missouri · Princeton
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With 35% of homes built before 1960 and about 48 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 8 times a year here, most often in July. A sump pump that hasn't run since last season is a common weak point.
Backups often follow heavy rain, which Mercer County gets about 8 days a year, when storm water overloads sewer mains and pushes up through the lowest drain in the house.
In Mercer County, 4.12 inches fell on the wettest day of the 2015–2024 record. Storms like that, and ice dams in snowy winters, cause most roof leaks.
32% of occupied homes in Mercer County heat mainly with wood or propane, above the Missouri county median of 24.5%.
About 42 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
With 1,902 homes and around 3,482 residents, Mercer County is 454 square miles of northwest Missouri. Princeton is the county seat; Mercer, Ravanna and South Lineville are the next largest communities. Half the homes here were built before 1970, half after.
54/100 Water Damage Risk Index: Elevated Mercer County ranks 43 of 114 Missouri counties. See the statewide ranking and method.The three factors where Mercer County ranks highest compared with other Missouri counties.
Mercer County gets more hard-freeze nights than most of Missouri. In the 2015–2024 record the county logged about 48 nights a year at or below 20°F (3rd of 114) and 121 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
Cold snaps are the real risk. The worst in the record lasted 16 days below freezing (ending January 2018), and the low bottomed out near -17°F on January 1, 2018.
Most freezing nights fall from November to March, 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 21 and end around Apr 18.
Mercer gets fewer downpours than most Missouri counties, but they still fill basements. Of roughly 37.3 inches of yearly precipitation, the damage comes from the 8 days a year with an inch or more, ranked 110th of 114. July, August and October see the most. The single wettest day in the record: 4.12 inches, June 25, 2021. The worst three-day stretch dropped 4.95 inches, ending September 30, 2019, the kind of soaking that overwhelms sump pumps and storm sewers.
Freeze-thaw days, below freezing overnight and above it by afternoon, come about 88 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
67% of homes in Mercer County predate 1980, above the Missouri county median of 53%, which ranks 17th of Missouri's 114 counties.
Before 1960 is when 35% of these homes went up. Galvanized supply lines and cast iron drains were standard then, and after 60-plus years both corrode and crack, often out of sight inside a wall or under a slab.
With 32% 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 42 times a year here, below the Missouri county median of 64.5. 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 expectBy main heating fuel, Mercer County homes break down as 36% utility gas, 25% electric, 23% propane and 9% 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 Mercer County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Putnam gets more pipe-freeze nights than Mercer. Grundy County has the oldest housing nearby, with 75% of homes built before 1980.
By the numbers
| Factor | Mercer | Missouri median | Rank |
|---|---|---|---|
| Homes built before 1960 | 35% | 25% | 24 of 114 |
| Homes built before 1980 | 67% | 53% | 17 of 114 |
| Homes built 2000 or later | 17% | 21% | 80 of 114 |
| Manufactured or mobile homes | 6.4% | 9.8% | 90 of 114 |
| Vacant homes | 32% | 15% | 10 of 114 |
| Wood or propane heat | 32% | 25% | 38 of 114 |
| Nights at 20°F or colder | 48/yr | 28/yr | 3 of 114 |
| Days with 1 inch+ of rain | 8/yr | 10/yr | 110 of 114 |
| Freeze-thaw days | 88/yr | 77/yr | 8 of 114 |
| Muggy nights (65°F+) | 42/yr | 65/yr | 111 of 114 |
Rank 1 is the highest value. Bars run from the lowest to the highest Missouri county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Mercer County: freezing from November to March, heavy rain in July, August and October.
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