North Henderson, IL
Lead detected, under the action levels
Latest 90th-percentile lead: 1.3 ppb (monitoring period 2023-2025). 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 North Henderson
North Henderson serves about 172 people through 80 service connections, which makes it a very small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Mercer County, Illinois. EPA system ID: IL1310300; phone on file: 309-299-3714. Call that number and ask whether your address has a lead, galvanized or unknown service line.
North Henderson's lead record
That is down 6.7 ppb from 8 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for North Henderson is 8 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1.3 ppb |
| 2022 | 8 ppb |
| 2019 | 1.3 ppb |
| 2016 | 6 ppb |
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. North Henderson's 1.3 ppb sits at the 64th percentile in Illinois and the 60th nationally (higher means more lead).
Neighbouring systems
13 other systems share Mercer County; 6 of them have a higher latest lead result than North Henderson. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Aledo | 3,470 | 3 ppb |
| Viola | 869 | 0 (not detected) |
| Sherrard | 785 | 1.9 ppb |
| Fyre Lake Water Company | 760 | 2.2 ppb |
| Keithsburg | 747 | 0 (not detected) |
| New Windsor | 740 | 6.2 ppb |
| Matherville | 651 | 11.6 ppb |
| New Boston | 613 | 0 (not detected) |
| Forrest Brooke Mhp | 491 | - |
| Joy | 377 | 1.7 ppb |
Next steps for North Henderson, IL
Test your own tap with a certified lab first-draw sample; North Henderson, 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 North Henderson 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. Size matters more than most people expect: small vs large water systems.