Illinois

Illinois drinking water quality

Every public water system in Illinois we've verified. Each report covers one calendar year and shows the utility's own measured contaminant levels against federal limits.

• Aurora (2024)
  19 contaminants measured
• Chicago (2023)
  15 contaminants measured
• Joliet (2024)
  16 contaminants measured· 1 at or above the limit
• Naperville (2024)
  14 contaminants measured