Millstone Pwd, IL
Exceeded the action level in the past
Latest 90th-percentile lead: 5.44 ppb (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.
Millstone Pwd at a glance
Millstone Pwd serves about 5,565 people through 2,288 service connections, which makes it a medium-sized system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Pope County, Illinois. EPA system ID: IL1515050; phone on file: 618-201-1252. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
That is up 5.44 ppb from 0 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Millstone Pwd is 51 ppb across 28 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 5.44 ppb |
| 2025 | 0 (not detected) |
| 2025 | 0 (not detected) |
| 2025 | 4.11 ppb |
| 2025 | 0 (not detected) |
| 2025 | 0 (not detected) |
| 2024 | 0 (not detected) |
| 2024 | 0 (not detected) |
| 2024 | 0 (not detected) |
| 2024 | 0 (not detected) |
| 2024 | 0 (not detected) |
| 2023 | 0 (not detected) |
| 2023 | 6.84 ppb |
| 2022 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2021 | 0 (not detected) |
| 2021 | 51 ppb over 15 |
| 2021 | 0 (not detected) |
| 2020 | 0 (not detected) |
| 2020 | 7 ppb |
| 2019 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2018 | 0 (not detected) |
| 2018 | 0 (not detected) |
| 2018 | 0 (not detected) |
| 2018 | 0 (not detected) |
| 2017 | 0 (not detected) |
| 2017 | 0 (not detected) |
How Millstone Pwd 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. Millstone Pwd's 5.44 ppb sits at the 89th percentile in Illinois and the 92nd nationally (higher means more lead).
Neighbouring systems
1 other system shares Pope County; 0 of them have a higher latest lead result than Millstone Pwd. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Golconda | 630 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Nashville, 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 Millstone Pwd 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.