Water Protection Program Rule Development

The following rule developments are being considered. The Regulatory Impact Report provides information on the rule development. Please provide comments in the time frames indicated. All comments received will be posted with responses prior to filing as a proposed rulemaking. Once filed and published in the Missouri Register, there will be another opportunity to comment during the proposed rulemaking open comment period and public hearing prior to adoption.

Under Gov. Greitens' leadership, all state agencies are working to reduce regulations or other government processes that unnecessarily burden individuals and businesses while doing little to protect or improve public health, safety and our natural resources. The Missouri Department of Natural Resources is committed to limiting regulation to what is necessary to protect Missouri's environment, implement statutory mandates and maintain state control of programs. Any proposed changes to rules discussed on this page are being developed with these goals in mind. We welcome your comments to help insure that our regulations provide required protections but do not add unneeded costs.

If you wish to provide comments on any existing department regulation, please visit the department’s Red Tape Reduction website.

Public Drinking Water Branch

None at this time


Water Pollution Control Branch

10 CSR 20-7.031 - Water Quality Standards

An amendment to Missouri Water Quality Standards has been published in the Oct. 16, 2017 Missouri Register (Volume 42, Number 20). The proposed amendment can be found from pages 1424 - 1539 of the MoReg at the following link: https://www.sos.mo.gov/CMSImages/AdRules/moreg/2017/v42n20Oct16/v42n20a.pdf

The public hearing was held at 9 am on Nov. 21, 2017 at the Department of Natural Resources, Lewis and Clark State Office Building, LaCharrette Conference Room, 1101 Riverside Dr., Jefferson City, MO 65101.

The purpose of this rulemaking is to update Missouri's Water Quality Standards. Several of the revisions are a result of stakeholder input gathered during the department's "Public Notice of Intent to Initiate Triennial Review of Missouri Water Quality Standards" and subsequent Water Protection Forum and Water Quality Standards workgroup meetings. Priorities established as a result of this process include addressing U.S. Environmental Protection Agency (EPA) disapproved items (i.e. numeric nutrient criteria for lakes), updating water quality criteria for pH and other pollutants, and changes to sections describing mixing zones, general criteria, and existing definitions. Portions of this rule require a Regulatory Impact Report pursuant to Chapter 536 RSMo.

A revised Regulatory Impact Report (RIR) is available that revises the report originally filed July 24, 2017. It has been revised to reflect key changes to the proposed rule, including removing the drinking water use and reassignment of Truman Lake to the Plains ecoregion. The report documents the environmental impact and economic costs and benefits associated with all the proposed changes. The revised RIR comment period was Sept. 25, 2017 through Nov. 24, 2017.

The Department of Natural Resources has posted responses to public comments on the proposed rule and RIR below.

10 CSR 20-7.031 Water Quality Standards Draft Rule
Public Comments Received for 10 CSR 20-7.031 Water Quality Standards Draft Rule
Response to Comments - Order of Rulemaking - Rule Text Changes
Rationale for Missouri Lake Numeric Nutrient Criteria, Dec. 2017
Numeric Nutrient Criteria for Missouri Lakes Fact Sheet

Regulatory Impact Report (RIR)
Public Comments Received for RIR (July 24, 2017)
Public Comments Received for RIR (Sept. 25, 2017)
Response to Public Comments (Comprehensive)

Water Quality Standards Public Notice Interactive Map
RIR Numeric Nutrient Criteria Cost Estimate
RIR Numeric Nutrient Criteria CAPDETS
RIR Potential Lake Nutrient Impairments
RIR Section 304(a) Criteria Facilities
RIR Water Quality Standards Public Notice Announcement
RIR Reference Documents

The Department of Natural Resources has posted comments and responses to comments received on the RIR and draft rule (above). The Department will recommend the Missouri Clean Water Commission adopt the Order of Rulemaking at its Jan. 4, 2018 meeting.