Illinois State University-Normal, IL
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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 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.
About Illinois State University-Normal
Illinois State University-Normal serves about 6,600 people through 100 service connections, which makes it a medium-sized system under EPA's size classes. It is owned by the state and draws groundwater, in Mclean County, Illinois. EPA system ID: IL1135510; phone on file: 309-438-2083. They can tell you what your service line is made of and whether they pay to replace it.
Illinois State University-Normal's lead record
Against the period ending 2025 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Illinois State University-Normal is 5.08 ppb across 6 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2025 | 0 (not detected) |
| 2025 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2016 | 5.08 ppb |
Against other Illinois systems
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. Illinois State University-Normal's reported as 0 (not detected) sits at the 49th percentile in Illinois and the 36th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
34 other systems share Mclean County; 13 of them have a higher latest lead result than Illinois State University-Normal. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Bloomington | 79,000 | 2.5 ppb |
| Normal | 52,736 | 3.7 ppb |
| Le Roy | 3,498 | 13 ppb |
| Heyworth | 2,853 | 0 (not detected) |
| Lexington | 1,930 | 0 (not detected) |
| Hudson | 1,847 | 0 (not detected) |
| Bloomington Township Pwd West Phase | 1,800 | 0 (not detected) |
| Chenoa | 1,800 | 1.7 ppb |
| Gridley | 1,411 | 0 (not detected) |
| Hilltop Mhp | 1,360 | 0 (not detected) |
Next steps for Normal, IL
Look up your address in Illinois State University-Normal'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 Illinois State University-Normal 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. Small systems behave differently: why small systems go over more often.