Knolls Edge Subdivision, 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.
Knolls Edge Subdivision at a glance
Knolls Edge Subdivision serves about 68 people through 27 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Ogle County, Illinois. EPA system ID: IL1415250; phone on file: 779-423-8291. 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 12.2 ppb from 12.2 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Knolls Edge Subdivision is 12.2 ppb across 4 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2022 | 12.2 ppb over 10 |
| 2019 | 0 (not detected) |
| 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. Knolls Edge Subdivision's reported as 0 (not detected) sits at the 2nd percentile in Illinois and the 6th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Ogle County
20 other systems share Ogle County; 5 of them have a higher latest lead result than Knolls Edge Subdivision. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Rochelle | 9,446 | 2.7 ppb |
| Byron | 3,784 | 0 (not detected) |
| Oregon | 3,449 | 0 (not detected) |
| Mount Morris | 2,861 | 1.1 ppb |
| Polo | 2,355 | 0 (not detected) |
| Davis Junction | 2,344 | 0 (not detected) |
| Forreston | 1,338 | 1.2 ppb |
| Hillcrest | 1,224 | 0 (not detected) |
| Stillman Valley | 1,200 | 0 (not detected) |
| Lost Lake Utility District | 704 | 0 (not detected) |
What to do in your house
Look up your address in Knolls Edge Subdivision'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 Knolls Edge Subdivision 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. What a 90th-percentile result does and does not tell you: how to read a lead result. A zero today does not rule out a jump later - the rules are tightening in 2027.