Richton Park, IL
Exceeded the action level in the past
Latest 90th-percentile lead: 2.14 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. 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 Richton Park
Richton Park serves about 12,504 people through 3,575 service connections, which makes it a large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Cook County, Illinois. EPA system ID: IL0312550; phone on file: 708-481-8950. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Richton Park's lead record
Against the period ending 2025 (1.18 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Richton Park is 21.1 ppb across 15 monitoring periods, 2 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 2.14 ppb |
| 2025 | 1.18 ppb |
| 2025 | 7.4 ppb |
| 2025 | 21.1 ppb over 15 |
| 2024 | 12 ppb over 10 |
| 2023 | 12.9 ppb over 10 |
| 2023 | 5.21 ppb |
| 2022 | 7.56 ppb |
| 2022 | 7.67 ppb |
| 2021 | 9.41 ppb |
| 2021 | 7.3 ppb |
| 2020 | 11.4 ppb over 10 |
| 2020 | 9.8 ppb |
| 2018 | 19 ppb over 15 |
| 2017 | 12 ppb over 10 |
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. Richton Park's 2.14 ppb sits at the 74th percentile in Illinois and the 74th nationally (higher means more lead).
Neighbouring systems
154 other systems share Cook County; 78 of them have a higher latest lead result than Richton Park. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Chicago | 2,721,308 | 6.4 ppb |
| Cicero | 83,000 | 5 ppb |
| Schaumburg | 75,750 | 0.87 ppb |
| Evanston | 74,486 | 6.5 ppb |
| Arlington Heights | 73,320 | 7.6 ppb |
| Palatine | 70,875 | 8.9 ppb |
| Skokie | 66,422 | 9.77 ppb |
| Des Plaines | 60,675 | 5.7 ppb |
| Oak Lawn | 58,362 | 9.3 ppb |
| Orland Park | 58,020 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Richton Park, 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 Richton Park 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.