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.
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
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
Integrated Report Coordinator
Watershed Protection Section Manager