Windsor, IL
Exceeded the action level in the past
Latest 90th-percentile lead: 7.82 ppb (monitoring period 2025-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
About Windsor
Windsor serves about 1,200 people through 550 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Shelby County, Illinois. EPA system ID: IL1730550; phone on file: 217-459-2291. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Windsor's lead record
That is up 7.82 ppb from 0 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Windsor is 61.3 ppb across 14 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 7.82 ppb |
| 2025 | 0 (not detected) |
| 2025 | 0 (not detected) |
| 2024 | 0 (not detected) |
| 2024 | 0 (not detected) |
| 2023 | 0 (not detected) |
| 2023 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2021 | 0 (not detected) |
| 2021 | 0 (not detected) |
| 2020 | 0 (not detected) |
| 2020 | 0 (not detected) |
| 2019 | 61.3 ppb over 15 |
Against other Illinois systems
Of the 1,744 Illinois systems with a lead result, the median latest reading is 0 ppb; 22 are over 15 ppb right now and 152 have gone over at some point. Windsor's 7.82 ppb sits at the 94th percentile in Illinois and the 96th nationally (higher means more lead).
Other water systems in Shelby County
8 other systems share Shelby County; 0 of them have a higher latest lead result than Windsor. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Shelbyville | 5,600 | 2.1 ppb |
| Moweaqua | 1,785 | 0 (not detected) |
| Findlay | 750 | 0 (not detected) |
| Stewardson | 734 | 0 (not detected) |
| Cowden | 534 | 5.6 ppb |
| Tower Hill | 500 | 0 (not detected) |
| Sigel | 400 | 0 (not detected) |
| Herrick | 358 | 3.1 ppb |
Next steps for Windsor, IL
Test your own tap with a certified lab first-draw sample; Windsor, IL may offer free or low-cost kits through the utility. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Windsor whether it covers that cost before hiring anyone - many utilities now do.
These figures describe homes the utility sampled, not your tap. Only your service line record or a test of your own water answers the question for your house. Why sampled homes are the worst-case ones is in the guide to reading the number. More in what a past exceedance means today.