Winslow, IL
Exceeded the action level in the past
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2026-2026). 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.
Who runs the water here
Winslow serves about 350 people through 160 service connections, which makes it a very small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Stephenson County, Illinois. EPA system ID: IL1770550; phone on file: 815-235-7643. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
Against the period ending 2025 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Winslow is 17.35 ppb across 12 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0 (not detected) |
| 2025 | 0 (not detected) |
| 2025 | 0 (not detected) |
| 2024 | 0 (not detected) |
| 2024 | 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) |
| 2017 | 17.35 ppb over 15 |
How Winslow compares
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. Winslow's reported as 0 (not detected) sits at the 15th percentile in Illinois and the 20th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
12 other systems share Stephenson County; 4 of them have a higher latest lead result than Winslow. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Freeport | 23,930 | 3.6 ppb |
| Lena | 2,680 | 0 (not detected) |
| Pearl City | 790 | 0.45 ppb |
| Orangeville | 780 | 0 (not detected) |
| Cedarville | 663 | 19 ppb |
| Il American-Northern Hill | 600 | 0 (not detected) |
| Davis | 589 | 0 (not detected) |
| Dakota | 500 | 0 (not detected) |
| German Valley | 463 | 1.1 ppb |
| Rock City | 293 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; Freeport, 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 Winslow 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. Why an old exceedance still matters: over the limit before, under it now.