Ionia County, Michigan · Ionia
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With 41% of homes built before 1960 and about 46 hard-freeze nights a year, frozen and split pipes are a leading winter risk in the county.
June brings the most downpours to Ionia County, part of 5 heavy-rain days a year. Check the sump first.
Backups often follow heavy rain, which Ionia County gets about 5 days a year, when storm water overloads sewer mains and pushes up through the lowest drain in the house.
In Ionia County, 2.98 inches fell on the wettest day of the 2015–2024 record. Storms like that, and ice dams in snowy winters, cause most roof leaks.
29% of occupied homes in Ionia County heat mainly with wood or propane, close to the Michigan county median of 29%.
With 17 muggy nights a year, mold in Ionia County can appear within days of a leak. Dry first, then clean.
Local risk profile
With 24,861 homes and around 66,574 residents, Ionia County is 571 square miles of southwest Michigan. Ionia is the county seat; Belding, Portland and Lake Odessa are the next largest communities. Half the homes here were built before 1972, half after.
64/100 Water Damage Risk Index: Elevated Ionia County ranks 9 of 83 Michigan counties. See the statewide ranking and method.The three factors where Ionia County ranks highest compared with other Michigan counties.
Pipe-freeze risk in Ionia County sits near the middle of the state. From 2015–2024 it averaged 46 nights a year at 20°F or colder, the range where pipes in exterior walls, crawl spaces and unheated garages freeze, and 135 nights at or below 32°F. That ranks 50th of 83 counties.
On February 20, 2015 the low fell to about -18°F, and in the stretch ending March 2015 the county went 21 days in a row below freezing. Leaks from split pipes typically appear the day the thaw arrives.
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 21 and end around Apr 30.
Heavy rain is a bigger factor here than in most of Michigan. About 5 days a year bring an inch or more (16th of 83), most often in June, out of 37 inches of total precipitation. On August 16, 2016, 2.98 inches fell in a single day. The worst three-day stretch dropped 4.87 inches, ending June 27, 2021, the kind of soaking that overwhelms sump pumps and storm sewers.
The temperature crosses 32°F in both directions on roughly 95 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
61% of homes in Ionia County predate 1980, close to the Michigan county median of 58.4%, which ranks 36th of Michigan's 83 counties.
Before 1960 is when 41% 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.
12% of homes are manufactured or mobile homes, above the Michigan county median of 7.3%. 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 17 nights a year in Ionia County stay at 65°F or warmer, a sign of muggy summer air (31st of 83 counties). October is the wettest month. 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 expectBy main heating fuel, Ionia County homes break down as 56% utility gas, 9% electric, 22% propane and 7% 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 Ionia County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Kent and Montcalm get more pipe-freeze nights than Ionia. Its housing is the oldest in the area by share of homes built before 1980.
By the numbers
| Factor | Ionia | Michigan median | Rank |
|---|---|---|---|
| Homes built before 1960 | 41% | 32% | 19 of 83 |
| Homes built before 1980 | 61% | 58% | 36 of 83 |
| Homes built 2000 or later | 19% | 16% | 29 of 83 |
| Manufactured or mobile homes | 12% | 7.3% | 14 of 83 |
| Vacant homes | 6.1% | 20% | 73 of 83 |
| Wood or propane heat | 29% | 29% | 42 of 83 |
| Nights at 20°F or colder | 46/yr | 54/yr | 50 of 83 |
| Days with 1 inch+ of rain | 5/yr | 3.9/yr | 16 of 83 |
| Freeze-thaw days | 95/yr | 95/yr | 42 of 83 |
| Muggy nights (65°F+) | 17/yr | 10/yr | 31 of 83 |
Rank 1 is the highest value. Bars run from the lowest to the highest Michigan county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Ionia County: freezing from November to March, heavy rain in June, 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