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Under Iowa's Water Quality Standards it is presumed that all perennial streams and rivers are attaining the highest level of recreation and aquatic life uses and should be protected for activities such as fishing and swimming. A Use Assessment and Use Attainability Analysis (UA/UAA) is a process of gathering field data and assessing the available information to determine if a stream is capable of supporting the highest level of recreation and aquatic life uses, and if not assign a more appropriate recreational and aquatic life use classification.
Assessing Iowa Stream Uses Fact Sheet
Fact sheet explaining UA/UAAs and Designated Uses
Surface Water Classification Document
Rule Referenced Document containing a list of Designated Stream in Iowa and their use classifications.
Use Assessment/Use Attainability Analysis Search
This database provides the opportunity to view the department's recommended use designations and supporting information.
Warm Water Stream Use Designation Protocol
Cold Water Protocol
Recreational Use Assessment and Attainability Analysis Protocol
Help us assess Iowa's streams: take the survey
The DNR is asking for your input on how you recreate in Iowa's streams as we complete recreational assessments on streams in the state. Please
take our online survey to list the streams you use, what activities you use them for and where you access the streams. The DNR will factor the results from the survey into its decision making for applying recreation-based stream designations to Iowa's waters. These assessments are part of classifying recreational stream uses in the state, and will help determine the appropriate level of protection for the stream.
US Environmental Protection Agency's Action Letter for Batch 4
Document containing EPA's review of Batch 4 UAA's.
DNR Contact: Matthew Dvorak
Iowa’s chemical criteria includes both numerical criteria listed in
61.3(3) Table 1 and General Water Quality Criteria described in 61.3(2). Numerical criteria apply to designated waters and general water quality criteria are applicable to all surface waters including general use and designated use waters. The following documents share information about specific criteria.
Chloride and Sulfate Criteria
Current Rule Making
DNR is updating the copper criteria for aquatic life protection. The purpose of the proposed rule is to create additional flexibility for wastewater dischargers by adding the option to use the Biotic Ligand Model (BLM) to determine copper water quality criteria or to use the Water-Effect Ratio (WER) to adjust the existing copper water quality criteria.
The proposed rule revisions include the following:
61.3(3) Table 1: (1) to add the alternative copper BLM criteria based on the EPA document, “Aquatic Life Ambient Freshwater Quality Criteria-Copper 2007 Revision (EPA-822-R-07-001, February 2007),” and (2) to add the alternative to adjust the hardness based copper criteria by a WER in accordance with the US EPA 1994 Interim Guidance on Determination and Use of Water-Effect Ratios for Metals (EPA-823-B-94-001) or, upon approval by the Department, the 2001 Streamlined Water-Effect Ratio Procedure for Discharges of Copper (EPA-822-R-01-005).
Point source discharge facilities can choose the alternative copper BLM or WER based criteria by collecting the appropriate site-specific data. For BLM based criteria site-specific water chemistry data are required; for WER based criteria the results of toxicity testing on site and laboratory water are required. If the data are acceptable, the copper BLM or WER based criteria are derived to replace the current hardness based criteria for the receiving stream segment.
DNR staff is preparing rule making documents to submit to the Governor’s Office.
DNR Contact: Connie Dou 515-725-8400 Connie.Dou@dnr.iowa.gov
Under the Clean Water Act, a state shall from time-to-time hold public meetings for the purpose of reviewing applicable water quality standards and, as appropriate, modifying and adopting standards. See
Chapter 61: Water Quality Standards. This review includes, but is not necessarily limited to: Designated Uses, Criteria, and Antidegradation.
Linked below are documents relating to the current Triennial Review for Iowa's water quality standards.
2015-2017 Triennial Review Documents:
DNR Contact: Matthew Dvorak 515-725-8397 firstname.lastname@example.org