Hazelwood 4th Addition, IL
Exceeded the action level in the past
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2026-2028). 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.
Who runs the water here
Hazelwood 4th Addition serves about 140 people through 50 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Henry County, Illinois. EPA system ID: IL0735350; phone on file: 309-944-6447. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
Against the period ending 2025 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Hazelwood 4th Addition is 30 ppb across 13 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2028 | 0 (not detected) |
| 2025 | 0 (not detected) |
| 2025 | 0 (not detected) |
| 2024 | 2.1 ppb |
| 2024 | 0 (not detected) |
| 2023 | 0 (not detected) |
| 2023 | 1.3 ppb |
| 2022 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2021 | 1.3 ppb |
| 2021 | 1.2 ppb |
| 2020 | 30 ppb over 15 |
| 2017 | 0.7 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. Hazelwood 4th Addition's reported as 0 (not detected) sits at the 6th percentile in Illinois and the 12th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
38 other systems share Henry County; 24 of them have a higher latest lead result than Hazelwood 4th Addition. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Kewanee | 12,509 | 3.3 ppb |
| Geneseo | 6,539 | 2.7 ppb |
| Colona West | 2,640 | 1.6 ppb |
| Colona East | 2,501 | 1 ppb |
| Galva | 2,449 | 1.4 ppb |
| Cambridge | 2,086 | 1.3 ppb |
| Orion | 1,754 | 5.5 ppb |
| Atkinson | 955 | 2.85 ppb |
| Annawan | 843 | 0 (not detected) |
| Woodhull | 771 | 1.5 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Geneseo, 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 Hazelwood 4th Addition 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. Why an old exceedance still matters: over the limit before, under it now.