North Aurora, IL
Exceeded the action level in the past
Latest 90th-percentile lead: 6.2 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 North Aurora
North Aurora serves about 18,261 people through 6,797 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 Kane County, Illinois. EPA system ID: IL0890600; phone on file: 331-385-6296. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
North Aurora's lead record
That is up 3.9 ppb from 2.3 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for North Aurora is 18 ppb across 11 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 6.2 ppb |
| 2025 | 2.3 ppb |
| 2025 | 14 ppb over 10 |
| 2025 | 0 (not detected) |
| 2025 | 18 ppb over 15 |
| 2024 | 10 ppb |
| 2023 | 8.4 ppb |
| 2022 | 9.4 ppb |
| 2021 | 12 ppb over 10 |
| 2020 | 2.5 ppb |
| 2017 | 3.8 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. North Aurora's 6.2 ppb sits at the 91st percentile in Illinois and the 94th nationally (higher means more lead).
Other water systems in Kane County
38 other systems share Kane County; 6 of them have a higher latest lead result than North Aurora. 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 |
| Sugar Grove | 11,243 | 0 (not detected) |
| Pingree Grove | 10,365 | 0 (not detected) |
Next steps for North Aurora, IL
Test your own tap with a certified lab first-draw sample; North Aurora, 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 North Aurora 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.