Water Quality Standards Regulations: Iowa
Presented are water quality standards in effect for Clean Water Act (CWA) purposes for this state.
EPA is posting these standards as a convenience to users and has made a reasonable effort to assure their accuracy. For each document listed under "State Standards in Effect for CWA Purposes", EPA has made a reasonable effort to identify parts of the standards that are disapproved or are otherwise not in effect for CWA purposes. Additionally, please note the documents may also contain provisions that EPA does not have the authority and duty to act on under the Clean Water Act because the provisions are not water quality standards.
State Standards in Effect for CWA Purposes
- Section 1: Title IV, Chapter 60, Wastewater Treatment and Disposal (pdf) (995.95 KB)
Section 2: Chapter 61, Water Quality Standards (2017) (pdf)
(Effective January 19, 2017) Surface water quality standards for waters of the state. Please note that not all provisions are effective for Clean Water Act purposes (refer to cover page for more information).
- The corresponding provisions which are in effect for Clean Water Act purposes can be found in
Section 2: Chapter 61, Water Quality Standards (2012) (pdf)
(Effective January 5, 2012). Refer to the cover page for more information.
- The corresponding provisions which are in effect for Clean Water Act purposes can be found in Section 2: Chapter 61, Water Quality Standards (2012) (pdf) (375.69 KB)
Surface Water Classifications (pdf)
(Effective March 3, 2020)
- Section 3: Modifications to Chapter IV - Basin Plan Support Document (pdf) (3.22 MB)
Federally Proposed or Promulgated Standards
- None at this time.
The document suggests how states and authorized tribes can conduct online public hearings in lieu of in-person public hearings, consistent with federal public hearing requirements.