Water Quality Standards Workgroup


This workgroup will provide input and assistance to the department in developing and refining appropriate water quality standards for the protection of Missouri’s streams, lakes and wetlands. Water quality standards are provisions in Missouri’s state regulations that describe the desired condition of a water body and the means by which that condition will be protected or achieved. The three core components of water quality standards are the designated uses of a water body, the criteria to protect those uses and antidegradation requirements to protect existing uses.

The department is continually working to improve Missouri’s water quality standards to best reflect the most recent science and regulatory obligations extended to Missouri’s waters.  

Triennial Review

Section 303(c)(1) of the Clean Water Act and the EPA’s implementing regulations at 40 CFR 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. On Jan. 2, 2019, the department made available for public comment the Intent to Initiate Triennial Review of Missouri Water Quality Standards. The public notice period ran through March 2, 2019. Visit the Water Protection Program Rule Development page for up-to-date information on the status of the 10 CSR 20-7.031 – Water Quality Standards rule.


Missouri’s Water Quality Standards [10 CSR 20-7.031]
Water Quality Standards Webpage
Water Quality Standards Map Viewer
EPA’s National Recommended Water Quality Criteria

Do you have a question or want to reach the Water Quality Standards group? Email us at wqs@dnr.mo.gov. We would love to hear from you!

Upcoming Workgroup Meetings

None scheduled at this time.

Meetings will be held at:
Lewis and Clark State Office Building
1101 Riverside Drive
Jefferson City, MO
1 p.m. – 3 p.m.

Past Workgroup Meetings

September 24, 2019 - Review draft rule language

September 13, 2019 - Agenda
Acute Cadmium Criteria-Aquatic Life Protection, Part 2 - Recommendations
Reference and Recommendations for Acute Cadmium Criteria for Aquatic Life Protection
Water Quality Standards Workgroup 2019-2020 Triennial Review Meeting #3

August 6, 2019 - Agenda
Aluminum - Review; Presentation
Cadmium - Presentation
Chloride plus Sulfate - Review; Presentation

July 23, 2019 - Agenda
Introduction Presentation
MUDD WBID System Review
DWS Use Review
IND Use Review