Ottawa County, Michigan · Grand Haven
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Ottawa County averages 40 nights a year at 20°F or colder, mostly November to March, and 19% of its homes predate 1960.
Heavy rain days of an inch or more come about 4.8 times a year here, most often in October. A sump pump that hasn't run since last season is a common weak point.
Backups often follow heavy rain, which Ottawa County gets about 4.8 days a year, when storm water overloads sewer mains and pushes up through the lowest drain in the house.
In Ottawa County, 2.49 inches fell on the wettest day of the 2015–2024 record. Storms like that, and ice dams in snowy winters, cause most roof leaks.
5% of occupied homes in Ottawa County heat mainly with wood or propane, below the Michigan county median of 29%.
With 18 muggy nights a year, mold in Ottawa County can appear within days of a leak. Dry first, then clean.
Local risk profile
With 117,604 homes and around 301,203 residents, Ottawa County is 564 square miles of southwest Michigan. Besides Grand Haven, the county seat, the biggest communities are Allendale, Jenison and Hudsonville. Much of its housing is recent, with a median build year of 1988.
35/100 Water Damage Risk Index: Moderate Ottawa County ranks 75 of 83 Michigan counties. See the statewide ranking and method.The three factors where Ottawa County ranks highest compared with other Michigan counties.
Winters here are on the gentler end for Michigan, and pipes still freeze. In the 2015–2024 record the county logged about 40 nights a year at or below 20°F (72nd of 83) and 127 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
Cold snaps are the real risk. The worst in the record lasted 18 days below freezing (ending March 2015), and the low bottomed out near -13°F on February 20, 2015.
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 25 and end around Apr 29.
Heavy rain is a bigger factor here than in most of Michigan. The county gets about 36.7 inches of rain and melted snow a year, with 4.8 days of an inch or more (20th of 83). Those downpours cluster in August, September and October, when sump pumps and gutters are tested hardest. The wettest day on record brought 2.49 inches on May 18, 2020. The worst three-day stretch dropped 4.97 inches, ending June 27, 2021, the kind of soaking that overwhelms sump pumps and storm sewers.
Freeze-thaw days, below freezing overnight and above it by afternoon, come about 94 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
Michigan's 83 counties range widely in housing age; Ottawa ranks 81st, with 40% of its homes built before 1980.
30% of homes were built in 2000 or later, more than in most of Michigan. Newer plumbing rarely corrodes, so damage here tends to come from appliance supply lines, water heaters, sump pumps and storms.
About 30% of homes went up between 1980 and 1999. Some houses from the late 1970s to the mid-1990s were plumbed with polybutylene, a gray plastic pipe known for failing at fittings. A plumber can tell you in a few minutes whether you have it.
Beyond water
Summer nights that don't drop below 65°F, a good marker of humid air, come about 18 times a year here, above the Michigan county median of 10. 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 expectMain heating fuel in Ottawa County's occupied homes: 84% utility gas, 9% electric, 4% propane and 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 Ottawa County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Kent and Muskegon get more pipe-freeze nights than Ottawa. Muskegon County has the oldest housing nearby, with 64% of homes built before 1980.
By the numbers
| Factor | Ottawa | Michigan median | Rank |
|---|---|---|---|
| Homes built before 1960 | 19% | 32% | 76 of 83 |
| Homes built before 1980 | 40% | 58% | 81 of 83 |
| Homes built 2000 or later | 30% | 16% | 2 of 83 |
| Manufactured or mobile homes | 5.4% | 7.3% | 62 of 83 |
| Vacant homes | 5.3% | 20% | 78 of 83 |
| Wood or propane heat | 4.8% | 29% | 78 of 83 |
| Nights at 20°F or colder | 40/yr | 54/yr | 72 of 83 |
| Days with 1 inch+ of rain | 4.8/yr | 3.9/yr | 20 of 83 |
| Freeze-thaw days | 94/yr | 95/yr | 45 of 83 |
| Muggy nights (65°F+) | 18/yr | 10/yr | 29 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 Ottawa County: freezing from November to March, heavy rain in August, September 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