Wisconsin Water Alerts — 18 Active Issues
Data source: NWS, EPA SDWIS Last verified: 2026-04-30
18 active water-related issues in Wisconsin. Last updated: 2026-04-30.
Weather & Safety Alerts (18)
Active alerts from the National Weather Service that may affect water safety:
Flood Warning — Severe
Areas: Winnebago, IL; Rock, WI
Flood Warning issued April 29 at 9:14PM CDT by NWS Milwaukee/Sullivan WI
Expires: April 30, 2026
Flood Warning — Severe
Areas: Lake, IL; Kenosha, WI
Flood Warning issued April 29 at 9:13PM CDT until May 1 at 7:00PM CDT by NWS Milwaukee/Sullivan WI
Expires: April 30, 2026
Flood Warning — Severe
Areas: Rock, WI
Flood Warning issued April 29 at 9:15PM CDT by NWS Milwaukee/Sullivan WI
Expires: April 30, 2026
Flood Warning — Severe
Areas: Jefferson, WI
Flood Warning issued April 29 at 9:14PM CDT until May 3 at 1:00AM CDT by NWS Milwaukee/Sullivan WI
Expires: April 30, 2026
Flood Warning — Severe
Areas: Jefferson, WI; Rock, WI
Flood Warning issued April 29 at 9:14PM CDT until May 5 at 7:00AM CDT by NWS Milwaukee/Sullivan WI
Expires: April 30, 2026
Flood Warning — Severe
Areas: Jefferson, WI
Flood Warning issued April 29 at 9:13PM CDT until May 1 at 1:00AM CDT by NWS Milwaukee/Sullivan WI
Expires: April 30, 2026
Flood Warning — Severe
Areas: Dodge, WI
Flood Warning issued April 29 at 9:12PM CDT by NWS Milwaukee/Sullivan WI
Expires: April 30, 2026
Flood Warning — Severe
Areas: Outagamie, WI; Shawano, WI; Waupaca, WI
Flood Warning issued April 29 at 8:13PM CDT until May 2 at 7:00PM CDT by NWS Green Bay WI
Expires: April 30, 2026
Flood Warning — Severe
Areas: Winnebago, WI
Flood Warning issued April 29 at 8:13PM CDT by NWS Green Bay WI
Expires: April 30, 2026
Flood Warning — Severe
Areas: Winnebago, WI
Flood Warning issued April 29 at 8:13PM CDT by NWS Green Bay WI
Expires: April 30, 2026
Freeze Warning — Moderate
Areas: Sherburne; Isanti; Chisago; Lac Qui Parle; Chippewa; Kandiyohi; Meeker; Wright; Yellow Medicine; Renville; McLeod; Polk; Barron; Rusk; St. Croix; Chippewa
Freeze Warning issued April 29 at 9:50PM CDT until April 30 at 8:00AM CDT by NWS Twin Cities/Chanhassen MN
Expires: April 30, 2026
Freeze Warning — Moderate
Areas: Taylor; Clark; Jackson; Monroe; Juneau; Adams
Freeze Warning issued April 29 at 9:12PM CDT until April 30 at 8:00AM CDT by NWS La Crosse WI
Expires: April 30, 2026
Frost Advisory — Minor
Areas: Hennepin; Anoka; Ramsey; Washington; Sibley; Carver; Scott; Dakota; Redwood; Brown; Nicollet; Le Sueur; Rice; Goodhue; Pierce; Dunn; Pepin; Eau Claire
Frost Advisory issued April 29 at 9:50PM CDT until April 30 at 8:00AM CDT by NWS Twin Cities/Chanhassen MN
Expires: April 30, 2026
Frost Advisory — Minor
Areas: Wabasha; Buffalo; Trempealeau; La Crosse; Vernon; Crawford; Richland
Frost Advisory issued April 29 at 9:12PM CDT until April 30 at 8:00AM CDT by NWS La Crosse WI
Expires: April 30, 2026
Frost Advisory — Minor
Areas: Brown; Calumet
Frost Advisory issued April 30 at 1:50AM CDT until April 30 at 8:00AM CDT by NWS Green Bay WI
Expires: April 30, 2026
...and 3 more alerts. See full weather alerts for details.
High-Risk Areas (Forecast)
ZIP codes in Wisconsin with the highest probability of future violations:
| ZIP | City | 2-Year Probability | Trend |
|---|---|---|---|
| 53005 | Brookfield | 95% | increasing |
| 53008 | Brookfield | 95% | increasing |
| 53010 | Campbellsport | 95% | increasing |
| 53015 | Cleveland | 95% | increasing |
| 53018 | Delafield | 95% | declining |
| 53022 | Germantown | 95% | declining |
| 53024 | Grafton | 95% | increasing |
| 53036 | Ixonia | 95% | increasing |
| 53037 | Jackson | 95% | increasing |
| 53038 | Johnson Creek | 95% | increasing |
Sources
- Weather alerts: National Weather Service
- Violations & enforcement: EPA SDWIS
- Compliance forecasts: ZipCheckup analysis
This page is regenerated daily. For real-time weather, visit weather.gov.