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Source Water Assessment Program

Source water assessments are provided to public water systems by IDEM and are intended to provide basic information to public water suppliers regarding:

  • Where their drinking water comes from.
  • The degree, called susceptibility, to which the drinking water source may be impacted by potential sources of contamination.
Susceptibility Determination

A system's susceptibility is rated on a scale from low to high. To find a public water system’s susceptibility determination, you may download or view one of the files below separated by system type. The spreadsheets are arranged by county:

Spreadsheet Columns
  • PWSID: Public Water Supply Identification Number
  • System Name: System Name on file with IDEM
  • County Name: County in which the system is located
  • System Status: Current status of system, either Active or Inactive
  • Susceptibility Determination: Final susceptibility determination made by IDEM

Resources for Pesticides and Nutrients in Source Water

Source Water Protection Workshop (2012)
Regional / State
Local (Watershed)

For additional educational resources refer to the resources page and reference materials page.

How You Can Protect Source Water

The Understanding and Protecting Your Drinking Water page provides information on how you can protect source water.


If you have any additional questions please contact the Groundwater Section.

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