Normal, IL
Lead detected, under the action levels
Latest 90th-percentile lead: 3.7 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. 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.
Normal at a glance
Normal serves about 52,736 people through 17,647 service connections, which makes it a large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Mclean County, Illinois. EPA system ID: IL1130900; phone on file: 309-454-9562. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
That is down 1.8 ppb from 5.5 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Normal is 9 ppb across 10 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 3.7 ppb |
| 2025 | 5.5 ppb |
| 2025 | 4.9 ppb |
| 2025 | 9 ppb |
| 2024 | 3.2 ppb |
| 2023 | 5.8 ppb |
| 2023 | 1.7 ppb |
| 2022 | 1.5 ppb |
| 2020 | 1.4 ppb |
| 2017 | 2.2 ppb |
How Normal 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. Normal's 3.7 ppb sits at the 83rd percentile in Illinois and the 86th nationally (higher means more lead).
Nearby utilities
34 other systems share Mclean County; 5 of them have a higher latest lead result than 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 |
| Illinois State University-Normal | 6,600 | 0 (not detected) |
| 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
Test your own tap with a certified lab first-draw sample; Normal, 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 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. The lead result guide covers how utilities pick the homes they sample. The action level is dropping - the 10 ppb rule from 2027.