Crest Hill, IL
Lead detected, under the action levels
Latest 90th-percentile lead: 2.14 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 Crest Hill
Crest Hill serves about 20,223 people through 6,658 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 Will County, Illinois. EPA system ID: IL1970250; phone on file: 815-723-8671. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
That is up 1.92 ppb from 0.22 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Crest Hill is 7.8 ppb across 12 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 2.14 ppb |
| 2025 | 0.22 ppb |
| 2025 | 1.23 ppb |
| 2025 | 0.81 ppb |
| 2024 | 0 (not detected) |
| 2024 | 1.46 ppb |
| 2023 | 1.27 ppb |
| 2023 | 1.34 ppb |
| 2022 | 2.38 ppb |
| 2022 | 2.56 ppb |
| 2021 | 7.8 ppb |
| 2018 | 0 (not detected) |
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. Crest Hill's 2.14 ppb sits at the 74th percentile in Illinois and the 74th nationally (higher means more lead).
Nearby utilities
49 other systems share Will County; 15 of them have a higher latest lead result than Crest Hill. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Joliet | 160,000 | 6.53 ppb |
| Il American-West Suburban | 73,978 | 0 (not detected) |
| Romeoville | 50,458 | 8.22 ppb |
| Plainfield | 50,000 | 0 (not detected) |
| New Lenox | 29,200 | 0 (not detected) |
| Il American-Homer Township | 24,543 | 0 (not detected) |
| Frankfort | 24,000 | 0.98 ppb |
| Lockport | 23,100 | 7.6 ppb |
| Mokena | 19,887 | 0 (not detected) |
| Shorewood | 18,645 | 2.3 ppb |
Next steps for Crest Hill, IL
Test your own tap with a certified lab first-draw sample; Crest Hill, 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 Crest Hill whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 1686 ppb (copper action level 1,300 ppb).
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. The action level is dropping - the 10 ppb rule from 2027.