Water Quality Standards Regulations: South Dakota
Presented are water quality standards in effect for Clean Water Act (CWA) purposes for this state.
The 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", the 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 the 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
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Chapter 74:51:01, Surface Water Quality (pdf)
(Effective August 17, 2023) State regulation establishing water quality standards for surface waters of the state. -
Chapter 74:51:02, Uses Assigned to Lakes (pdf)
(Effective August 17, 2023) -
Chapter 74:51:03, Uses Assigned to Streams (pdf)
(Effective August 17, 2023) - Antidegradation Implementation Procedure (pdf)
- Mixing Zone and Dilution Implementation Guide (pdf)
South Dakota's water quality standards are applicable to "waters of the State". In some limited instances, the definition adopted by South Dakota for "waters of the State" as part of its water quality standards may result in water quality standards that are more comprehensive than required under section 303(c) of the CWA and the implementing federal regulations. EPA has included the State's water quality standards in their entirety here for context and as supplementary information for the reader.
South Dakota water quality standards apply to all waters within the State of South Dakota, with the exception of those waters that are within Indian Country, as defined in 18 U.S.C. Section 1151. EPA's approval of South Dakota's water quality standards was not intended as an action to approve or disapprove water quality standards applying to waters within Indian Country. EPA, or eligible Indian Tribes, as appropriate, will retain responsibilities for water quality standards within Indian Country.
Federally Proposed or Promulgated Standards
- None at this time.