Calumet City, IL
Above the new 10 ppb level coming in 2027
Latest 90th-percentile lead: 11 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. Under the current 15 ppb rule this is not an exceedance, but it is above the 10 ppb action level that takes over in Nov 2027. Test your own tap; filter if your result shows lead.
Calumet City at a glance
Calumet City serves about 37,000 people through 9,832 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 surface water, in Cook County, Illinois. EPA system ID: IL0310390; phone on file: 708-891-8155. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Calumet City's lead record
That is down 4 ppb from 15 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Calumet City is 17 ppb across 6 monitoring periods, 2 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 11 ppb over 10 |
| 2025 | 15 ppb over 10 |
| 2025 | 15.5 ppb over 15 |
| 2024 | 17 ppb over 15 |
| 2021 | 11 ppb over 10 |
| 2018 | 5.93 ppb |
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. Calumet City's 11 ppb sits at the 97th percentile in Illinois and the 98th nationally (higher means more lead).
Neighbouring systems
154 other systems share Cook County; 7 of them have a higher latest lead result than Calumet City. 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) |
Next steps for Calumet City, IL
Test your own tap with a certified lab first-draw sample; Calumet City, 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 Calumet City 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. This system is in the band the 2027 10 ppb rule changes.