The federal Clean Water Act (CWA) requires each state to report on the quality of its surface waters and to identify and prioritize those waters that are impaired and need a total maximum daily load (TMDL). As the state agency responsible for implementing the CWA in Idaho, DEQ fulfills these reporting requirements by preparing Idaho’s Integrated Report.
Every two years, Idaho’s Integrated Report is submitted to the U.S Environmental Protection Agency (EPA) for approval and made available to the public. The report satisfies reporting requirements of the CWA by documenting the current conditions of all state waters (CWA § 305(b)), including an assessment of publicly owned lakes (CWA § 314), and listing and prioritizing those waters that are impaired and need a TMDL (CWA § 303(d)).
Once approved by EPA, the Integrated Report serves as a guide for developing and implementing water quality improvement plans (i.e., TMDLs) to restore water quality and achieve federal and state water quality standards. The report can also be used by the state to guide its water quality management decisions.
Idaho's most recently approved report is its 2016 Integrated Report. The 2016 Integrated report was submitted to EPA for review on November 9, 2018, and approved by EPA on June 25, 2019 (EPA Approval Letter).
There are several ways to access information in Idaho’s 2016 Integrated Report:
- Download the full 2016 Integrated Report (PDF)
- Download a map that displays the status all of all state water bodies (32 inches x 42 inches) (PDF)
- Use the 2016 Integrated Report Interactive Mapper to search for water body-specific results (Online)
Idaho’s 2018/2020 Integrated Report – Under EPA Review
DEQ submitted Idaho’s 2018/2020 Integrated Report to EPA on October 1, 2020. The report is currently under EPA review and available at the bottom of this web page. However, the 2016 Integrated Report should be used to guide decision-making until the 2018/2020 Integrated Report is approved by EPA.
There are several ways to access information in Idaho’s 2018/2020 Integrated Report:
- Download the full 2018/2020 Integrated Report (PDF) or use the interactive 2018/2020 Integrated Report StoryMap (StoryMap)
- Download the 2018/2020 Integrated Report Appendix A: Clean Water Act Section 305(b) List and 303(d) List (PDF/Excel)
- Download a map that displays the status of all state water bodies (32 inches x 42 inches) (PDF)
- Use the 2018/2020 Integrated Report Interactive Mapper to search for water body-specific results (Online)