Corinth Pwd, IL
Lead detected, under the action levels
Latest 90th-percentile lead: 4.57 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. 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 Corinth Pwd
Corinth Pwd serves about 3,927 people through 1,700 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 surface water, in Williamson County, Illinois. EPA system ID: IL1995120; phone on file: 618-923-0635. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Corinth Pwd's lead record
That is up 4.57 ppb from 0 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Corinth Pwd is 4.57 ppb across 5 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 4.57 ppb |
| 2025 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2016 | 0 (not detected) |
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. Corinth Pwd's 4.57 ppb sits at the 86th percentile in Illinois and the 89th nationally (higher means more lead).
Nearby utilities
23 other systems share Williamson County; 2 of them have a higher latest lead result than Corinth Pwd. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Marion | 16,855 | 1.2 ppb |
| Herrin | 12,747 | 9.8 ppb |
| Lake Of Egypt Pwd | 11,368 | 0 (not detected) |
| Carterville | 6,528 | 7.54 ppb |
| Coal Valley Pwd | 4,023 | 0 (not detected) |
| Johnston City | 3,509 | 0 (not detected) |
| Pittsburg | 2,948 | 0 (not detected) |
| Cambria | 1,727 | 0 (not detected) |
| Crainville | 1,711 | 0 (not detected) |
| Fci-Marion | 1,544 | 0 (not detected) |
Next steps for Pittsburg, IL
Test your own tap with a certified lab first-draw sample; Pittsburg, 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 Corinth 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. What a 90th-percentile result does and does not tell you: how to read a lead result. Systems that went over once often dip back under; here is what that means.