Highway 37 North Pwd, 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.
Highway 37 North Pwd at a glance
Highway 37 North Pwd serves about 1,068 people through 427 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 surface water, in Williamson County, Illinois. EPA system ID: IL1995100; phone on file: 618-899-3437. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
Against the period ending 2022 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Highway 37 North Pwd is 6.8 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2019 | 6.8 ppb |
| 2016 | 1.4 ppb |
How Highway 37 North 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. Highway 37 North Pwd's reported as 0 (not detected) sits at the 32nd percentile in Illinois and the 27th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Williamson County
23 other systems share Williamson County; 5 of them have a higher latest lead result than Highway 37 North 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) |
| Corinth Pwd | 3,927 | 4.57 ppb |
| 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) |
Next steps for Marion, IL
Look up your address in Highway 37 North Pwd'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 Highway 37 North 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. Small systems behave differently: why small systems go over more often.