Lake Barrington, IL
Exceeded the action level in the past
Latest 90th-percentile lead: 3 ppb (monitoring period 2026-2028). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
About Lake Barrington
Lake Barrington serves about 500 people through 89 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 Lake County, Illinois. EPA system ID: IL0971080; phone on file: 847-842-6080. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
That is down 12 ppb from 15 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Lake Barrington is 20 ppb across 10 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2028 | 3 ppb |
| 2025 | 15 ppb over 10 |
| 2024 | 7.4 ppb |
| 2023 | 8.9 ppb |
| 2022 | 6.8 ppb |
| 2021 | 12 ppb over 10 |
| 2020 | 4.5 ppb |
| 2020 | 10 ppb |
| 2019 | 20 ppb over 15 |
| 2016 | 0 (not detected) |
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. Lake Barrington's 3 ppb sits at the 80th percentile in Illinois and the 82nd nationally (higher means more lead).
Neighbouring systems
103 other systems share Lake County; 30 of them have a higher latest lead result than Lake Barrington. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Waukegan | 87,149 | 10 ppb |
| Vernon Hills - Lake Co Pw | 33,207 | 0 (not detected) |
| Mundelein | 31,500 | 4.3 ppb |
| Gurnee | 30,193 | 0.3 ppb |
| Highland Park | 30,176 | 0 (not detected) |
| Round Lake Beach | 27,200 | 0 (not detected) |
| Zion | 24,442 | 11.2 ppb |
| Great Lakes Naval Training Station | 23,000 | 0 (not detected) |
| Grayslake | 21,248 | 11 ppb |
| Libertyville | 20,500 | 5.61 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Lake Barrington, 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 Lake Barrington 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. Why sampled homes are the worst-case ones is in the guide to reading the number. More in what a past exceedance means today.