Oreana, IL
Exceeded the action level in the past
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2025-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest 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 Oreana
Oreana serves about 892 people through 365 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 Macon County, Illinois. EPA system ID: IL1150450; phone on file: 217-468-2112. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
That is down 2.53 ppb from 2.53 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Oreana is 29.6 ppb across 12 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2025 | 2.53 ppb |
| 2024 | 0 (not detected) |
| 2023 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2021 | 4.64 ppb |
| 2020 | 0 (not detected) |
| 2020 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2017 | 29.6 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. Oreana's reported as 0 (not detected) sits at the 29th percentile in Illinois and the 26th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
13 other systems share Macon County; 5 of them have a higher latest lead result than Oreana. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Decatur | 76,122 | 2.6 ppb |
| Long Creek Township Pws | 7,850 | 2.8 ppb |
| Mount Zion | 5,833 | 6.8 ppb |
| Forsyth | 3,490 | 0 (not detected) |
| Maroa | 1,700 | 0 (not detected) |
| Harristown | 1,320 | 0 (not detected) |
| Blue Mound | 1,300 | 0 (not detected) |
| Warrensburg | 1,230 | 7 ppb |
| Macon | 1,205 | 0 (not detected) |
| Argenta | 900 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Forsyth, 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 Oreana 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. More in what a past exceedance means today.