Illinois Water Alerts — 37 Active Issues
Data source: NWS, EPA SDWIS Last verified: 2026-04-30
37 active water-related issues in Illinois. Last updated: 2026-04-30.
Weather & Safety Alerts (37)
Active alerts from the National Weather Service that may affect water safety:
Flood Warning — Severe
Areas: Winnebago, IL
Flood Warning issued April 30 at 12:44AM CDT until April 30 at 10:00AM CDT by NWS Chicago IL
Expires: April 30, 2026
Flood Warning — Severe
Areas: St. Clair, IL; St. Louis, MO; St. Louis City, MO
Flood Warning issued April 29 at 9:38PM CDT until May 3 at 5:00AM CDT by NWS St Louis MO
Expires: May 1, 2026
Flood Warning — Severe
Areas: Madison, IL; St. Charles, MO
Flood Warning issued April 29 at 9:38PM CDT until May 4 at 4:00PM CDT by NWS St Louis MO
Expires: May 1, 2026
Flood Warning — Severe
Areas: Monroe, IL; Jefferson, MO
Flood Warning issued April 29 at 9:38PM CDT until May 3 at 10:36PM CDT by NWS St Louis MO
Expires: May 1, 2026
Flood Warning — Severe
Areas: Jersey, IL; St. Charles, MO
Flood Warning issued April 29 at 9:38PM CDT until May 4 at 10:00PM CDT by NWS St Louis MO
Expires: May 1, 2026
Flood Warning — Severe
Areas: Madison, IL; St. Charles, MO
Flood Warning issued April 29 at 9:38PM CDT until May 2 at 10:00PM CDT by NWS St Louis MO
Expires: May 1, 2026
Flood Warning — Severe
Areas: Jackson, IL; Randolph, IL; Perry, MO; Ste. Genevieve, MO
Flood Warning issued April 29 at 9:38PM CDT until May 6 at 11:48AM CDT by NWS St Louis MO
Expires: May 1, 2026
Flood Warning — Severe
Areas: Crawford, IL; Lawrence, IL; Knox, IN; Sullivan, IN
Flood Warning issued April 29 at 10:33PM EDT until May 5 at 2:00PM EDT by NWS Indianapolis IN
Expires: April 30, 2026
Flood Warning — Severe
Areas: Crawford, IL; Lawrence, IL; Knox, IN; Sullivan, IN
Flood Warning issued April 29 at 10:33PM EDT until May 5 at 5:00AM EDT by NWS Indianapolis IN
Expires: April 30, 2026
Flood Warning — Severe
Areas: Clark, IL; Crawford, IL; Sullivan, IN; Vigo, IN
Flood Warning issued April 29 at 10:33PM EDT until May 3 at 5:00PM EDT by NWS Indianapolis IN
Expires: April 30, 2026
Flood Warning — Severe
Areas: Pike, IL; Ralls, MO
Flood Warning issued April 29 at 9:28PM CDT until May 2 at 7:00PM CDT by NWS St Louis MO
Expires: May 1, 2026
Flood Warning — Severe
Areas: Adams, IL; Lewis, MO
Flood Warning issued April 29 at 9:28PM CDT until May 1 at 2:50AM CDT by NWS St Louis MO
Expires: May 1, 2026
Flood Warning — Severe
Areas: Pike, IL; Pike, MO
Flood Warning issued April 29 at 9:28PM CDT until May 4 at 10:00PM CDT by NWS St Louis MO
Expires: May 1, 2026
Flood Warning — Severe
Areas: Pike, IL; Marion, MO
Flood Warning issued April 29 at 9:28PM CDT until May 3 at 7:00PM CDT by NWS St Louis MO
Expires: May 1, 2026
Flood Warning — Severe
Areas: Calhoun, IL; Pike, MO
Flood Warning issued April 29 at 9:28PM CDT until May 4 at 3:00PM CDT by NWS St Louis MO
Expires: May 1, 2026
...and 22 more alerts. See full weather alerts for details.
High-Risk Areas (Forecast)
ZIP codes in Illinois with the highest probability of future violations:
| ZIP | City | 2-Year Probability | Trend |
|---|---|---|---|
| 60002 | Antioch | 95% | increasing |
| 60004 | Arlington Heights | 95% | increasing |
| 60005 | Arlington Heights | 95% | increasing |
| 60006 | Arlington Heights | 95% | increasing |
| 60007 | Elk Grove Village | 95% | declining |
| 60009 | Elk Grove Village | 95% | declining |
| 60012 | Crystal Lake | 95% | increasing |
| 60014 | Crystal Lake | 95% | increasing |
| 60015 | Deerfield | 95% | increasing |
| 60016 | Des Plaines | 95% | increasing |
Sources
- Weather alerts: National Weather Service
- Violations & enforcement: EPA SDWIS
- Compliance forecasts: ZipCheckup analysis
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