La Prairie, IL
Lead detected, under the action levels
Latest 90th-percentile lead: 0.6 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. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
La Prairie at a glance
La Prairie serves about 47 people through 23 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 Adams County, Illinois. EPA system ID: IL0010300; phone on file: 217-222-6550. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
Against the period ending 2025 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for La Prairie is 1 ppb across 10 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2028 | 0.6 ppb |
| 2025 | 0 (not detected) |
| 2025 | 0 (not detected) |
| 2024 | 0.7 ppb |
| 2024 | 0 (not detected) |
| 2023 | 0 (not detected) |
| 2023 | 0 (not detected) |
| 2022 | 0.8 ppb |
| 2019 | 1 ppb |
| 2016 | 0.7 ppb |
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. La Prairie's 0.6 ppb sits at the 56th percentile in Illinois and the 44th nationally (higher means more lead).
Neighbouring systems
19 other systems share Adams County; 4 of them have a higher latest lead result than La Prairie. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Quincy | 42,000 | 0.55 ppb |
| Abs Water Coop | 7,095 | 0 (not detected) |
| Mill Creek Pwd | 5,755 | 1.8 ppb |
| Clayton-Camp Point Water Commission | 2,470 | 0 (not detected) |
| Payson | 1,386 | 0 (not detected) |
| Camp Point | 1,190 | 0 (not detected) |
| Mendon | 953 | 0 (not detected) |
| Adams County Water District No 1 | 800 | 0 (not detected) |
| Clayton | 709 | 0 (not detected) |
| Ursa | 626 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; La Prairie, 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 La Prairie whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 1400 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. Size matters more than most people expect: small vs large water systems.