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Methodology and Guidance: 2022 Integrated Report

States are required under the Clean Water Act (CWA) Section 303(d) to compile a list of waters that do not support their designated beneficial uses and submit the list in a biennial Integrated Report to the Environmental Protection Agency (EPA) for approval. Beneficial uses include drinking water, recreation, aquatic life, and agriculture.The 303(d) list identifies the pollutant(s) causing the impairment and prioritizes the development of Total Maximum Daily Loads (TMDLs) to meet state water quality standards and support beneficial uses.

The draft assessment methodology document describes Utah’s assessment methods for the 2022 IR cycle. The document complies with federal regulations that require states to evaluate all existing and readily available data against both narrative and numeric criteria when developing their 303(d) lists.

Summary of Methods Changes

Draft 2022 303(d) Assessment Methods – Changes from previous version

Section Subsection Page Range Nature of Change
Assessment Process and Time Frames Developing the Methods/Public Review of the Methods Process and Schedule 19 Edits to timing details for 2022 Integrated Report.
Scope of the Assessment Assessment Units 28 Removed a section on required datums used for assessment unit shape files.
Data Submission Process Period of Record 38 Changed to reflect current POR and our plan to incorporate accepted data from the 2018/2020 IR within the 2022 POR.
Assessments Specific to Flowing Surface Waters of the State and Canals Conventional Parameter Assessments 41-46 Changed the percent exceedance language. Now, we calculate a percent exceedance based on the number of samples (or averages) exceeding the criterion divided by the total number of samples. Details therein.
Assessments Specific to Flowing Surface Waters of the State and Canals Nutrient Assessments Specific to Headwater Streams 46-50 New method
Escherichia coli Assessment for All Waters Data Preparation 70-75 Changed percent exceedance language in Scenario A to be consistent with conventional parameter assessments section.
Narrative Standards for All Waters Harmful Algal Blooms (HAB) 77 Assessments on hold.
Appendix 1 Priority Parameters 97-107 Added Headwater Numeric Nutrient Criteria parameters and noted the hold on HAB assessment parameters.
Appendix 6 EPA Delisting Codes 113 Updated EPA Delisting Codes

Public Comment Period Open

Submit Comments
The Draft 2022 IR Assessment Methods document is open for a public comment period (174 KB) that begins January 20, 2021, and ends February 26, 2021. Submit comments by clicking the button above. Effective comments provide technical feedback on assessment methods and point out unintended consequences.

Note: This will be the only opportunity to provide comments on IR Assessment Methods until the next IR reporting cycle. Any comments on assessment methods received after the close of the current comment period will be considered out of scope for the 2022 Integrated Report.

Questions and Comments

Elise Hinman
Integrated Report Coordinator
(801) 536-4346

Jodi Gardberg
Watershed Protection Section Manager
(801) 536-4372