Sheffield, IL
Lead detected, under the action levels
Latest 90th-percentile lead: 1.4 ppb (monitoring period 2022-2024). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
About Sheffield
Sheffield serves about 821 people through 460 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 groundwater, in Bureau County, Illinois. EPA system ID: IL0110950; phone on file: 815-454-2034. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Sheffield's lead record
That is down 1.71 ppb from 3.11 ppb in the period ending 2021. The highest 90th-percentile result EPA holds for Sheffield is 3.81 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 1.4 ppb |
| 2021 | 3.11 ppb |
| 2018 | 3.81 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. Sheffield's 1.4 ppb sits at the 66th percentile in Illinois and the 62nd nationally (higher means more lead).
Other water systems in Bureau County
23 other systems share Bureau County; 6 of them have a higher latest lead result than Sheffield. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Princeton | 7,832 | 21 ppb |
| Spring Valley | 5,582 | 0 (not detected) |
| De Pue | 1,838 | 0 (not detected) |
| Walnut | 1,311 | 5.4 ppb |
| Ladd | 1,263 | 0 (not detected) |
| Wyanet | 886 | 19.5 ppb |
| Tiskilwa | 740 | 0 (not detected) |
| Dalzell | 663 | 0 (not detected) |
| Lamoille | 660 | 22.3 ppb |
| Cherry | 490 | 13.8 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Sheffield, 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 Sheffield 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. Systems that went over once often dip back under; here is what that means.