Stateville Correctional Center, IL
Exceeded the action level in the past
Latest 90th-percentile lead: 3.96 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.
Who runs the water here
Stateville Correctional Center serves about 992 people through 1 service connections, which makes it a small system under EPA's size classes. It is owned by the state and draws groundwater, in Will County, Illinois. EPA system ID: IL1977910; phone on file: 815-727-3607. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
That is up 1.62 ppb from 2.34 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Stateville Correctional Center is 39.5 ppb across 20 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 3.96 ppb |
| 2025 | 2.34 ppb |
| 2024 | 1.61 ppb |
| 2023 | 0 (not detected) |
| 2023 | 2.42 ppb |
| 2022 | 9.8 ppb |
| 2022 | 3.6 ppb |
| 2021 | 39.5 ppb over 15 |
| 2021 | 5.05 ppb |
| 2020 | 6.31 ppb |
| 2020 | 7.55 ppb |
| 2019 | 3.77 ppb |
| 2018 | 3.98 ppb |
| 2018 | 3.98 ppb |
| 2018 | 2.42 ppb |
| 2018 | 2.42 ppb |
| 2017 | 2.62 ppb |
| 2017 | 2.62 ppb |
| 2016 | 0 (not detected) |
| 2016 | 0 (not detected) |
How Stateville Correctional Center 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. Stateville Correctional Center's 3.96 ppb sits at the 84th percentile in Illinois and the 87th nationally (higher means more lead).
Neighbouring systems
49 other systems share Will County; 5 of them have a higher latest lead result than Stateville Correctional Center. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Joliet | 160,000 | 6.53 ppb |
| Il American-West Suburban | 73,978 | 0 (not detected) |
| Romeoville | 50,458 | 8.22 ppb |
| Plainfield | 50,000 | 0 (not detected) |
| New Lenox | 29,200 | 0 (not detected) |
| Il American-Homer Township | 24,543 | 0 (not detected) |
| Frankfort | 24,000 | 0.98 ppb |
| Lockport | 23,100 | 7.6 ppb |
| Crest Hill | 20,223 | 2.14 ppb |
| Mokena | 19,887 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Crest Hill, 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 Stateville Correctional Center whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 2140 ppb (copper action level 1,300 ppb).
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.