Nitrate in Illinois Well Water

In Illinois, nitrate levels average 7.153 mg/L, with a maximum recorded level of 25.133 mg/L. The EPA limit is 10 mg/L. Currently 5.3% of tested wells exceed this limit, affecting approximately 23,850 wells.

Testing for nitrate in Illinois typically costs around $111. If treatment is needed, water treatment systems for nitrate cost approximately $263.

The risk level for nitrate in Illinois is rated as low. The state average of 7.153 mg/L is 65.1% above the national average of 4.332 mg/L.