We administer federal and state funds for grants and low-interest loans to improve the quality of Idaho’s water resources. Our drinking water grants and loans assist eligible public drinking water systems with facility planning projects to ensure safe and adequate drinking water supplies. Our wastewater grants and loans help entities build or repair existing wastewater treatment facilities to achieve and maintain compliance with state and federal standards or to provide direct water quality benefits.
Funding Opportunities
The Fiscal Year 2026 Letters of Interest (LOIs) are available and must be submitted by January 10, 2025.
A virtual training about LOI updates will be held on November 4, 2024, from 2:00 – 3:00 p.m. (MST). Register here.
LOI Forms
- FY26 Drinking Water Planning Grant LOI Form
- FY26 Wastewater Planning Grant LOI Form
- FY26 Drinking Water State Revolving Fund LOI Form
- FY26 Clean Water State Revolving Fund LOI Form
- FY26 Drinking Water Lead Service Line LOI Form
- FY26 Drinking Water Emerging Contaminants LOI Form
- FY26 Clean Water Emerging Contaminants LOI Form
Questions regarding funding can be sent to grants.loans@deq.idaho.gov.
Funding Assistance at a Glance
Learn about the FY2023 American Rescue Plan Act and FY2024 Leading Idaho priority lists. Updated February 1, 2024.
- ARPA infrastructure projects
- Leading Idaho infrastructure projects
- ARPA planning grants
- Leading Idaho planning grants
- Idaho DEQ ARPA Water Infrastructure Grants Interactive Map
Click on the maps below to learn about drinking water and wastewater funding by county for 2000-2024.
