Chicago Department of Water Management

Data from the City of Chicago can be found on their website: City of Chicago’s Comprehensive Chemical Analysis

DuPage Water Commission

Data from DuPage Water Commission can be found below.
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  • 2025
  • 2024
  • 2023
  • 2022
  • 2021
  • 2026
  • 2025
  • 2024
  • 2023
  • 2022
  • 2021
  • 2018 Lead Update 2
  • 2018 Lead Update 1
  • 2017 Lead Update
  • 2016 Lead Update 2
  • 2016 Lead Update 1

Any documents prior to 2021 are available upon FOIA request.