Rockdale, IL
Lead detected, under the action levels
Latest 90th-percentile lead: 1.25 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.
Rockdale at a glance
Rockdale serves about 2,012 people through 945 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 groundwater, in Will County, Illinois. EPA system ID: IL1970850; phone on file: 815-725-8937. 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 2025 (2.18 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Rockdale is 13 ppb across 12 monitoring periods, none of them over 15 ppb (5 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 1.25 ppb |
| 2025 | 2.18 ppb |
| 2025 | 12.8 ppb over 10 |
| 2025 | 4.53 ppb |
| 2024 | 12.3 ppb over 10 |
| 2023 | 8.1 ppb |
| 2023 | 8.6 ppb |
| 2022 | 10.6 ppb over 10 |
| 2022 | 8.27 ppb |
| 2019 | 3.09 ppb |
| 2016 | 13 ppb over 10 |
| 2016 | 13 ppb over 10 |
How Rockdale 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. Rockdale's 1.25 ppb sits at the 64th percentile in Illinois and the 60th nationally (higher means more lead).
Nearby utilities
49 other systems share Will County; 22 of them have a higher latest lead result than Rockdale. 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 |
| Crest Hill | 20,223 | 2.14 ppb |
| Mokena | 19,887 | 0 (not detected) |
Next steps for Rockdale, IL
Test your own tap with a certified lab first-draw sample; Rockdale, 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 Rockdale whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 1748 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. The lead result guide covers how utilities pick the homes they sample. Systems that went over once often dip back under; here is what that means.