Windwood Water System, Inc., IL
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2023-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
Who runs the water here
Windwood Water System, Inc. serves about 185 people through 74 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Knox County, Illinois. EPA system ID: IL0955040; phone on file: 309-299-2698. They can tell you what your service line is made of and whether they pay to replace it.
Windwood Water System, Inc.'s lead record
That is down 2 ppb from 2 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Windwood Water System, Inc. is 2.2 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2022 | 2 ppb |
| 2019 | 0 (not detected) |
| 2016 | 2.2 ppb |
Where this result ranks
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. Windwood Water System, Inc.'s reported as 0 (not detected) sits at the 8th percentile in Illinois and the 14th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Knox County
16 other systems share Knox County; 11 of them have a higher latest lead result than Windwood Water System, Inc.. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Galesburg | 31,620 | 0 (not detected) |
| Abingdon | 3,275 | 0 (not detected) |
| Knoxville | 3,120 | 0 (not detected) |
| Aqua Illinois-Oak Run | 1,885 | 4 ppb |
| Wataga | 965 | 1.3 ppb |
| East Galesburg | 860 | 3.4 ppb |
| Yates City | 828 | 5.37 ppb |
| Williamsfield | 647 | 3.01 ppb |
| Oneida | 644 | 0 (not detected) |
| Altona | 483 | 4.1 ppb |
Next steps for Galesburg, IL
Look up your address in Windwood Water System, Inc.'s service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Windwood Water System, Inc. 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. The lead result guide covers how utilities pick the homes they sample. Small systems behave differently: why small systems go over more often.