Milwaukee County, Wisconsin · Milwaukee
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Pipes freeze in Milwaukee County on about 47 nights a year, mostly November to March. Older homes, 56% of the stock here, are most at risk.
Basements flood here mostly in August. Milwaukee County averages 5.5 days a year with an inch of rain or more.
56% 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.
Milwaukee County's wettest day in the 2015–2024 record brought 4.89 inches, and about 88 freeze-thaw days a year mean ice dams in some winters.
1% of occupied homes in Milwaukee County heat mainly with wood or propane, below the Wisconsin county median of 32.9%.
With 24 muggy nights a year, mold in Milwaukee County can appear within days of a leak. Dry first, then clean.
Local risk profile
About 926,331 people live in Milwaukee County, 241 square miles in southeast Wisconsin, in roughly 426,715 homes. Besides Milwaukee, the county seat, the biggest communities are West Allis, Wauwatosa and Greenfield. It has some of the oldest housing in the state: the median home went up in 1957.
52/100 Water Damage Risk Index: Elevated Milwaukee County ranks 34 of 72 Wisconsin counties. See the statewide ranking and method.The three factors where Milwaukee County ranks highest compared with other Wisconsin counties.
Winters here are on the gentler end for Wisconsin, and pipes still freeze. It averaged 125 freezing nights a year over 2015–2024, 47 of them at 20°F or colder, cold enough for pipes in outside walls and crawl spaces to freeze. Among 72 Wisconsin counties that's 71st.
On January 31, 2019 the low fell to about -23°F, and in the stretch ending March 2015 the county went 19 days in a row below freezing. Leaks from split pipes typically appear the day the thaw arrives.
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 27 and end around Apr 30.
Milwaukee gets fewer downpours than most Wisconsin counties, but they still fill basements. Of roughly 35.6 inches of yearly precipitation, the damage comes from the 5.5 days a year with an inch or more, ranked 49th of 72. June, August and September see the most. The single wettest day in the record: 4.89 inches, September 12, 2022. The worst three-day stretch dropped 5.48 inches, ending September 13, 2022, the kind of soaking that overwhelms sump pumps and storm sewers.
About 88 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
79% of homes in Milwaukee County predate 1980, above the Wisconsin county median of 54.1%, which ranks 1st of Wisconsin's 72 counties.
56% were built before 1960. Homes from that era often still have galvanized steel supply pipe, which rusts from the inside until it pinholes, and cast iron drains that crack with age. Slow leaks behind walls are a common start to water damage in these houses.
Renters occupy 50% of homes. If you rent, the building is usually the landlord's to repair, but your belongings are only covered by renters insurance.
Beyond water
Summer nights that don't drop below 65°F, a good marker of humid air, come about 24 times a year here, above the Wisconsin county median of 11. 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 expectMain heating fuel in Milwaukee County's occupied homes: 77% utility gas, 19% electric, 1% propane and under 1% wood. Most homes here heat with gas or electricity, so cooking and electrical faults are the likelier fire sources. Even a contained kitchen fire can send soot through the ductwork to every room.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Milwaukee County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Every neighboring county gets more pipe-freeze nights than Milwaukee. Its housing is the oldest in the area by share of homes built before 1980.
By the numbers
| Factor | Milwaukee | Wisconsin median | Rank |
|---|---|---|---|
| Homes built before 1960 | 56% | 31% | 1 of 72 |
| Homes built before 1980 | 79% | 54% | 1 of 72 |
| Homes built 2000 or later | 10% | 21% | 72 of 72 |
| Manufactured or mobile homes | 0.5% | 4.8% | 71 of 72 |
| Vacant homes | 8% | 12% | 45 of 72 |
| Wood or propane heat | 1.4% | 33% | 72 of 72 |
| Nights at 20°F or colder | 47/yr | 73/yr | 71 of 72 |
| Days with 1 inch+ of rain | 5.5/yr | 6.3/yr | 49 of 72 |
| Freeze-thaw days | 88/yr | 94/yr | 68 of 72 |
| Muggy nights (65°F+) | 24/yr | 11/yr | 1 of 72 |
Rank 1 is the highest value. Bars run from the lowest to the highest Wisconsin county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Milwaukee County: freezing from November to March, heavy rain in June, August and September.
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