Lockport, IL
Exceeded the action level in the past
Latest 90th-percentile lead: 7.6 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. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
About Lockport
Lockport serves about 23,100 people through 9,839 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: IL1970500; phone on file: 815-838-0549. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
That is up 6.59 ppb from 1.01 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Lockport is 30 ppb across 11 monitoring periods, 2 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 7.6 ppb |
| 2025 | 1.01 ppb |
| 2025 | 0.46 ppb |
| 2025 | 30 ppb over 15 |
| 2025 | 9.9 ppb |
| 2024 | 4.9 ppb |
| 2023 | 16.3 ppb over 15 |
| 2023 | 12.3 ppb over 10 |
| 2022 | 13.9 ppb over 10 |
| 2020 | 7.21 ppb |
| 2017 | 11.4 ppb over 10 |
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. Lockport's 7.6 ppb sits at the 94th percentile in Illinois and the 95th nationally (higher means more lead).
Nearby utilities
49 other systems share Will County; 1 of them has a higher latest lead result than Lockport. 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 |
| Crest Hill | 20,223 | 2.14 ppb |
| Mokena | 19,887 | 0 (not detected) |
| Shorewood | 18,645 | 2.3 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Lockport, 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 Lockport 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. More in what a past exceedance means today.