Newark, IL
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. 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.
About Newark
Newark serves about 986 people through 389 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 Kendall County, Illinois. EPA system ID: IL0930100; phone on file: 815-695-5671. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
That is down 5 ppb from 5 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Newark is 5 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2022 | 5 ppb |
| 2019 | 1.45 ppb |
| 2016 | 0 (not detected) |
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. Newark's reported as 0 (not detected) sits at the 31st percentile in Illinois and the 27th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
8 other systems share Kendall County; 6 of them have a higher latest lead result than Newark. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Oswego | 38,169 | 0 (not detected) |
| Yorkville | 23,000 | 0.75 ppb |
| Plano | 12,600 | 2.3 ppb |
| Il American-Valley Marina | 1,102 | 4 ppb |
| Fox Lawn Homeowners Water Association | 167 | 0 (not detected) |
| Il American-Hollis | 107 | 1 ppb |
| Storybook Highlands | 100 | 2.62 ppb |
| Morgan Creek | 66 | 6.89 ppb |
Your move
Look up your address in Newark'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 Newark 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.