East Dundee, IL
Above the new 10 ppb level coming in 2027
Latest 90th-percentile lead: 12 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.
Who runs the water here
East Dundee serves about 3,115 people through 1,522 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 Kane County, Illinois. EPA system ID: IL0890250; phone on file: 224-293-7114. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
That is up 6 ppb from 6 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for East Dundee is 18 ppb across 8 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 12 ppb over 10 |
| 2025 | 6 ppb |
| 2025 | 1.6 ppb |
| 2025 | 2.8 ppb |
| 2025 | 18 ppb over 15 |
| 2024 | 8.4 ppb |
| 2021 | 1.1 ppb |
| 2016 | 2.2 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. East Dundee's 12 ppb sits at the 97th percentile in Illinois and the 98th nationally (higher means more lead).
Other water systems in Kane County
38 other systems share Kane County; 3 of them have a higher latest lead result than East Dundee. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Aurora | 183,000 | 25.7 ppb |
| Elgin | 114,797 | 18.5 ppb |
| Carpentersville | 37,983 | 1.1 ppb |
| St Charles | 33,081 | 3.9 ppb |
| Montgomery | 28,956 | 0 (not detected) |
| Batavia | 26,098 | 3.82 ppb |
| South Elgin | 23,648 | 1.4 ppb |
| Geneva | 21,247 | 5.35 ppb |
| North Aurora | 18,261 | 6.2 ppb |
| Sugar Grove | 11,243 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; East Dundee, 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 East Dundee 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.