Water Quality Standards
The DNR manages water quality through the implementation of the state's Water Quality Standards. These standards are found in Chapter 61 of the Iowa Administrative Code. The States Water Quality Standards help ensure that all Iowans have surface waters that are fishable and swimmable to the fullest extent practicable, safe drinking water, groundwater that is free from harmful contamination, protection from the adverse effects of floods, and water resources that are put to their best beneficial uses.

Rulemaking: Stream Designation Updates

The DNR is proposing a 5th batch of revisions to stream designations across the state of Iowa. These designation changes are the result of Use Attainability Analysis (UAA) conducted on these streams. Following are documents associated with this rule making:

Notice of Intended Action (4227C)
Responsiveness Summary
2018 Surface Water Classification document Final
2018 Surface Water Classification document with changes marked Final
List of Batch 5 stream designation changes (sorted by stream name)
List of Batch 5 stream designation changes (sorted by affected facilities)

You can find other documents that may be of interest on this page under the Use Assessment and Use Attainability Analysis tab including: a UAA Fact Sheet, the current Surface Water Classification document, and a link to the UAA database where you can find the assessments for these recommended designation changes.

DNR Contact: 
Matthew Dvorak 

+ Antidegradation
+ Use Assessments and Use Attainability Analysis
+ Chemical Criteria
+ Triennial Review

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.

The state of Iowa is beginning its next triennial review period (2018-2020). As part of that process, the DNR is holding public hearings for the public to voice their opinions on the DNR's water quality standards priorities during the triennial review period.

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