Protecting Public Health and the Environment.

Source Water in Idaho

Source water is the untreated ground water (aquifers and springs) and surface waters (rivers, streams, and lakes) used to supply drinking water for private, domestic wells and public water systems. Ground water and surface water used for drinking water supplies are often vulnerable to contamination from land use practices (such as farming) and potential contaminant sources (such as gas stations) within the vicinity of drinking water wells and intakes. However, steps can be taken to minimize this vulnerability and help keep public drinking water free from contaminants.

Source Water Assessments

A source water assessment provides information on the potential contaminant threats to public drinking water sources. In Idaho, ground water is the source of 95% of drinking water. As required by the Safe Drinking Water Act, assessments of all recognized public water sources in Idaho have been completed and summarized in reports that define the zone of contribution, identify the significant potential sources of contamination, and determine the likelihood that the water supply will become contaminated. Learn more and access the report on your water system.

Source Water Protection

Source water protection is a voluntary effort a community can implement to help prevent contamination of the source water that supplies its public water system. The effort may involve creating a source water (or drinking water) protection plan and implementing regulatory and/or non-regulatory management practices. Learn more.

Source Water Protection Activity Guide

The Source Water Protection Activity Guide is a tool for identifying potential sources and types of contamination that could threaten drinking water sources. It provides possible protection activities that public water systems, local governments, businesses, and individuals can implement to better protect source water from contamination. Learn more.

Source Water Protection Planning Tool

The Source Water Protection Planning Tool assists public water systems in developing a source water protection plan and contingency plan for their water system. The tool gathers information from existing databases, as well as input from user entry to create a planning document. Learn more.

Source Water Protection Grants

Source Water Protection Grants provide funding for projects to protect sources of public drinking water. Projects are expected to provide long-term benefits to drinking water quality, quantity, awareness, and/or security. Learn more.


DEQ State Office - Water Quality Division

1410 N. Hilton
Boise, ID 83706
(208) 373-0502

Staff Contacts

Source Water Program Coordinator
Amy Williams
(208) 373-0115
amy.williams@deq.idaho.gov

Source Water Protection Implementation Coordinator
Kathryn Elliott
(208) 373-0191
kathryn.elliott@deq.idaho.gov

DEQ Resources

Idaho's Source Water Protection Program

DEQ Source Water Assessment Online Application

More Information

Source Water Assessment

Source Water Protection Program

Related Pages

Ground Water in Idaho

Drinking Water in Idaho