The Clean Water Act (CWA) requires states to submit a biennial, Integrated Report to the Environmental Protection Agency (EPA) on the quality of their surface waters. This report analyzes water quality data to determine if assessed waterbodies support their designated beneficial uses. These beneficial uses include drinking water, recreation, aquatic life, agriculture, and the Great Salt Lake. Waterbodies that do not support one or more of their designated beneficial uses are classified as non-supporting and placed on the CWA 303(d) list of impaired waters. The report guides the development and implementation of water quality plans (Total Maximum Daily Load plans, or TMDLs) that bring impaired waterbodies into compliance with state water quality standards.
Utah’s Integrated Report (IR) fulfills these requirements under the CWA. The report includes:
- Water quality assessment methods used for the report
- Summary of the overall condition of Utah’s waters and significant water quality threats to their beneficial uses (305(b) report).
- Impaired waters that fail to meet water quality standards or are biologically impaired (303(d) list).
The CWA requires a formal public comment period on the IR before submission to the EPA. Upon completion of this comment period, the Division of Water Quality (DWQ) submits the report, public comments, and its response to comments to EPA for approval. EPA reviews the report to ensure that assessments were based on all existing, credible, and readily available data and each assessment is legally and scientifically justified. EPA can approve or deny the 303(d) list.
Current Reporting Cycle
Waterbody assessment and data evaluation is a continuous process. DWQ scientists developed and implemented a number of process improvements during the current reporting cycle to increase automation, accuracy, efficiency, and consistency. The time required for tool development and process improvements extended the reporting cycle, resulting in a combined 2018/2020 IR.
The Draft Combined 2018/2020 IR is available for review and public comment on October 21, 2020.
Most Recent EPA-Approved Report
Utah’s 2016 Integrated Report (IR) is the most recent EPA-approved version. The 2016 report is used to guide management decisions until EPA approves the Combined 2018/2020 IR. The 2016 IR was submitted to EPA for review on December 7, 2016, and approved by EPA on May 30, 2018.