Cedarville, IL
Above the federal action level
Latest 90th-percentile lead: 19 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. In the most recent monitoring period, more than 10% of the sampled homes measured above 15 ppb. Use a filter certified to NSF/ANSI 53 for lead for drinking and cooking now, and test your own tap.
About Cedarville
Cedarville serves about 663 people through 331 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 Stephenson County, Illinois. EPA system ID: IL1770050; phone on file: 815-291-6650. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
That is up 19 ppb from 0 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Cedarville is 19 ppb across 6 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 19 ppb over 15 |
| 2025 | 0 (not detected) |
| 2025 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2016 | 0 (not detected) |
How Cedarville 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. Cedarville's 19 ppb sits at the 99th percentile in Illinois and the 99th nationally (higher means more lead).
Nearby utilities
12 other systems share Stephenson County; 0 of them have a higher latest lead result than Cedarville. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Freeport | 23,930 | 3.6 ppb |
| Lena | 2,680 | 0 (not detected) |
| Pearl City | 790 | 0.45 ppb |
| Orangeville | 780 | 0 (not detected) |
| Il American-Northern Hill | 600 | 0 (not detected) |
| Davis | 589 | 0 (not detected) |
| Dakota | 500 | 0 (not detected) |
| German Valley | 463 | 1.1 ppb |
| Winslow | 350 | 0 (not detected) |
| Rock City | 293 | 0 (not detected) |
Your move
Use a filter certified to NSF/ANSI 53 for lead on the tap you drink and cook from, now, before you test. Then test your own tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Cedarville whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 1380 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.