Start Date and Time
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Division/ Program/ Commission/ Board/ Forum/ Committee
Water Protection Program
Areas of Focus
Water Quality
Contact Name
John Hoke
Contact Email
Contact Phone Number
(573) 751-1300
(800) 361-4827
Type of Notice/ Event
Public Notice/ Public Comment
Topic Name
10 CSR 20-7.031 Water Quality Standards

A proposed amendment to 10 CSR 20-7.031, Water Quality Standards, is now available for public review and comment until Aug. 31, 2021. Written comments may be submitted by mail to the Missouri Department of Natural Resources, Water Protection Program, P.O. Box 176, Jefferson City, MO 65102-0176 or online through the Regulatory Action Tracking System.

Section 303(c)(1) of the Clean Water Act and EPA's implementing regulations at 40 C.F.R. § 131.20, require that states, from time to time, but at least once every three years, hold public hearings to review applicable water quality standards and, as appropriate, modify and adopt water quality standards. The purpose of this amendment is to update the Water Quality Standards, such as variances, revisions to EPA disapproved language and updated references to documents. For additional details, please review the information available in the Regulatory Action Tracking System.

Proposed Variances, Site-specific Criteria, UAA and Presumed Use Reviews
Proposed Changes to the Missouri Use Designation Dataset map viewer

The department will hold a public hearing about the proposed amendment during the Clean Water Commission meeting scheduled for Aug. 25, 2021. Please follow the link below for more information.