Anoka County, Minnesota · Anoka
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Anoka County averages 81 nights a year at 20°F or colder, mostly November to April, and 13% of its homes predate 1960.
Basements flood here mostly in August. Anoka County averages 5.6 days a year with an inch of rain or more.
Sewage backups in Anoka County spike on heavy-rain days, about 5.6 a year, when sewer mains fill up and water finds the lowest drain.
Roof leaks here come from summer downpours and, with about 85 freeze-thaw days a year, from winter ice dams. Most show up as ceiling stains in the room below.
3% of occupied homes in Anoka County heat mainly with wood or propane, below the Minnesota county median of 30%.
With 19 muggy nights a year, mold in Anoka County can appear within days of a leak. Dry first, then clean.
Local risk profile
About 370,349 people live in Anoka County, 422 square miles in southern Minnesota, in roughly 141,863 homes. Besides Anoka, the county seat, the biggest communities are Blaine, Coon Rapids and Andover. Much of its housing is recent, with a median build year of 1986.
38/100 Water Damage Risk Index: Moderate Anoka County ranks 72 of 87 Minnesota counties. See the statewide ranking and method.The three factors where Anoka County ranks highest compared with other Minnesota counties.
Winters here are on the gentler end for Minnesota, and pipes still freeze. In the 2015–2024 record the county logged about 81 nights a year at or below 20°F (61st of 87) and 154 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
On January 31, 2019 the low fell to about -31°F, and in the stretch ending March 2019 the county went 32 days in a row below freezing. Leaks from split pipes typically appear the day the thaw arrives.
Most freezing nights fall from November to April, 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 17 and end around Apr 30.
Rainfall is about average for Minnesota. The county gets about 30.6 inches of rain and melted snow a year, with 5.6 days of an inch or more (34th of 87). Those downpours cluster in May, July and August, when sump pumps and gutters are tested hardest. The wettest day on record brought 3.1 inches on August 11, 2016. The worst three-day stretch dropped 3.51 inches, ending October 3, 2017, the kind of soaking that overwhelms sump pumps and storm sewers.
Freeze-thaw days, below freezing overnight and above it by afternoon, come about 85 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
Minnesota's 87 counties range widely in housing age; Anoka ranks 76th, with 41% of its homes built before 1980.
27% of homes were built in 2000 or later, more than in most of Minnesota. Newer plumbing rarely corrodes, so damage here tends to come from appliance supply lines, water heaters, sump pumps and storms.
The 1980s and 1990s account for 33% of the county's homes. If yours is from those decades, look under the sinks and at the water heater for gray plastic pipe stamped PB, which is polybutylene and leak-prone.
Beyond water
Anoka County averages 19 warm, muggy nights a year (lows of 65°F or more) and gets the most rain in August. The EPA recommends keeping indoor humidity below 60%, ideally 30 to 50%. Basements can pass 60% on their own in summer, so a dehumidifier matters even without a leak, and anything wet should be dried within 24 to 48 hours.
Mold remediation: what to expectHeating fuel matters for fire risk. In Anoka County it's 83% utility gas, 13% electric, 2% 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 Anoka County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Chisago, Isanti and Sherburne get more pipe-freeze nights than Anoka. Ramsey County has the oldest housing nearby, with 69% of homes built before 1980.
By the numbers
| Factor | Anoka | Minnesota median | Rank |
|---|---|---|---|
| Homes built before 1960 | 13% | 34% | 80 of 87 |
| Homes built before 1980 | 41% | 58% | 76 of 87 |
| Homes built 2000 or later | 27% | 21% | 28 of 87 |
| Manufactured or mobile homes | 3.3% | 3.8% | 48 of 87 |
| Vacant homes | 3.1% | 11% | 84 of 87 |
| Wood or propane heat | 2.5% | 30% | 85 of 87 |
| Nights at 20°F or colder | 81/yr | 89/yr | 61 of 87 |
| Days with 1 inch+ of rain | 5.6/yr | 5.3/yr | 34 of 87 |
| Freeze-thaw days | 85/yr | 86/yr | 54 of 87 |
| Muggy nights (65°F+) | 19/yr | 13/yr | 19 of 87 |
Rank 1 is the highest value. Bars run from the lowest to the highest Minnesota county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Anoka County: freezing from November to April, heavy rain in May, 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