Neponset, IL
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
Neponset at a glance
Neponset serves about 450 people through 185 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 Bureau County, Illinois. EPA system ID: IL0110700; phone on file: 309-594-2201. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
That is down 2.26 ppb from 2.26 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Neponset is 13.4 ppb across 5 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2025 | 2.26 ppb |
| 2024 | 0.06 ppb |
| 2021 | 13.4 ppb over 10 |
| 2018 | 0 (not detected) |
How Neponset 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. Neponset's reported as 0 (not detected) sits at the 19th percentile in Illinois and the 22nd nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
23 other systems share Bureau County; 11 of them have a higher latest lead result than Neponset. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Princeton | 7,832 | 21 ppb |
| Spring Valley | 5,582 | 0 (not detected) |
| De Pue | 1,838 | 0 (not detected) |
| Walnut | 1,311 | 5.4 ppb |
| Ladd | 1,263 | 0 (not detected) |
| Wyanet | 886 | 19.5 ppb |
| Sheffield | 821 | 1.4 ppb |
| Tiskilwa | 740 | 0 (not detected) |
| Dalzell | 663 | 0 (not detected) |
| Lamoille | 660 | 22.3 ppb |
Next steps for Neponset, IL
Look up your address in Neponset's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Neponset 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. Small systems behave differently: why small systems go over more often.