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.
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:
- 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
- Community Public Water Supply Systems Susceptibility Determinations [PDF]
- Includes all completed assessments for a public water system that provides water for human consumption to at least 15 service connections used by year-round residents, or one that regularly serves at least 25 year-round residents (e.g., municipalities, subdivisions, and mobile home parks).
- Non-Transient Non-Community Supply Systems Susceptibility Determinations [PDF]
- Includes all completed assessments for a public water system that regularly serve at least 25 of the same individuals over six (6) months (e.g., schools, churches, businesses).
- Transient Non-Community Supply Systems Susceptibility Determinations [PDF]
- Includes all completed assessments for a public water system that does not regularly serve at least 25 of the same individuals over six (6) months (e.g., highway rest stops, restaurants, parks).
Resources for Pesticides and Nutrients in Source Water
Source Water Protection Workshop (2012)
- Atrazine Test Kit for Quick Results [PDF]
- CCR99 - Resource Conserving Crop Rotations [PDF]
- Patoka River Rapid Watershed Assessment [PDF]
- Phosphorus Best Management Practices (BMPs) [PDF]
- Source Water Collaborative
- USDA: NRCS Interactive Data Viewer
- U.S. EPA: Drinking Water Contaminants
- U.S. EPA: Gulf of Mexico Nutrient Task Force
- U.S. EPA: Information about Nutrient Pollution
- USGS: Pesticides and Source Water Studies
Regional / State
- Aquifer Vulnerability Analysis for Water Resource Protection [PDF]
- Indiana Drinking Water Viewer
- Indiana’s Nutrient Reduction Strategy
- Indiana Watershed Management Plans
- 2011 CEES, IUPUI Presentation on Taste and Odor Compounds in Patoka Lake
- Rapid Watershed Assessment for the Patoka River Watershed [PDF]
- Patoka Lake 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.