South Holland, IL
Exceeded the action level in the past
Latest 90th-percentile lead: 4.6 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 South Holland
South Holland serves about 22,000 people through 9,214 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: IL0312970; phone on file: 708-339-2323. They can tell you what your service line is made of and whether they pay to replace it.
South Holland's lead record
That is down 3.3 ppb from 7.9 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for South Holland is 107 ppb across 17 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 4.6 ppb |
| 2025 | 7.9 ppb |
| 2025 | 0.4 ppb |
| 2025 | 0.7 ppb |
| 2025 | 2.3 ppb |
| 2025 | 8.3 ppb |
| 2024 | 1.6 ppb |
| 2023 | 6.7 ppb |
| 2023 | 1.9 ppb |
| 2022 | 3 ppb |
| 2022 | 11 ppb over 10 |
| 2021 | 107 ppb over 15 |
| 2020 | 8.22 ppb |
| 2019 | 14 ppb over 10 |
| 2019 | 0 (not detected) |
| 2018 | 3.99 ppb |
| 2017 | 5.5 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. South Holland's 4.6 ppb sits at the 86th percentile in Illinois and the 90th nationally (higher means more lead).
Neighbouring systems
154 other systems share Cook County; 53 of them have a higher latest lead result than South Holland. 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; South Holland, 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 South Holland 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.