Chloride in Illinois Well Water

In Illinois, chloride levels average 160.607 mg/L, with a maximum recorded level of 790.4 mg/L. The EPA limit is 250 mg/L. Currently 10.0% of tested wells exceed this limit, affecting approximately 45,000 wells.

Testing for chloride in Illinois typically costs around $133. If treatment is needed, water treatment systems for chloride cost approximately $1,760.

The risk level for chloride in Illinois is rated as moderate. The state average of 160.607 mg/L is 39.8% above the national average of 114.869 mg/L.