Minnesota Thermal Discharges: What you need to know

Governing Law and Regulations

Minnesota Water Quality Standards: Minnesota Rules (MR) 7050.0180 and MR 7050.0220

For a Limited Time receive a FREE EHS Report "Recordkeeping for EHS Managers." This special report contains a recordkeeping checklist to help you keep track of your records for major environmental laws and OSHA's Hazard Communication Standard. Download Now

Thermal limitations: MR 7050.0220

Outstanding resource value waters (ORVWs): MR 7050.0180

Indirect discharges: MR 5900.4500

Regulatory Agency

Minnesota Pollution Control Agency (MPCA) Environmental Analysis and Outcomes Division

Metropolitan Waste Control Commission (MWCC)

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. Minnesota has established specific guidelines for thermal discharges into its waters. The state's regulations generally follow the federal Clean Water Act (CWA). See the national section THERMAL DISCHARGES for more information.

Administration and enforcement. MPCA's Environmental Analysis and Outcomes Division is responsible for the administration and enforcement of the state's rules for developing water quality standards for lakes, rivers, and streams, including standards for thermal discharges.

State Requirements


MR 7050.0220

Thermal discharge limitations for state receiving waters are provided on the individual discharge permits. Generally, however, temperatures may not be increased more than 5°F above the natural temperature in streams, and more than 3°F above the natural temperature in lakes. Under no circumstances may the average daily temperature exceed 86°F. These levels are based on a monthly average of the maximum daily temperatures of the receiving water. See the terms of your discharge permit and contact MPCA for additional guidance.

Thermal Discharge Variances

Dischargers may apply for variances from the thermal discharge ...

>> Read more about Thermal Discharges

State Requirements

National | Alabama | Arizona | Arkansas | California | Colorado | Connecticut | Delaware | Florida | Georgia | Illinois | Indiana | Iowa | Kansas | Kentucky | Louisiana | Maryland | Massachusetts | Michigan | Minnesota | Mississippi | Missouri | Montana | New Hampshire | New Jersey | New York | North Carolina | Ohio | Oklahoma | Oregon | Pennsylvania | Rhode Island | South Carolina | Tennessee | Texas | Utah | Virginia | Washington | West Virginia | Wisconsin |

Minnesota Thermal Discharges Resources

Thermal Discharges Products

Free Special Reports
Get Your FREE Special Report. Download Any One Of These FREE Special Reports, Instantly!
Featured Special Report
Claim Your Free Copy of Recordkeeping for EHS Managers

One of the most tedious aspects of an EHS manager’s job is to keep track of a host of records. Laws have been passed in every jurisdiction requiring facilities to produce and retain records of various kinds. Don’t get caught without the necessary records in the event of a surprise EPA or OSHA inspection! This special report shows EHS managers at a glance the records they must keep on hand and for how long.

Download Now!

This special report contains a recordkeeping checklist to help you keep track of your records for major environmental laws and OSHA’s Hazard Communication Standard.

Also included are 3 useful tables which provide:
  • A summary listing of federal environmental recordkeeping requirements
  • A list of federal safety recordkeeping requirements.
  • A list of federal recordkeeping requirements for DOT and the Department of Homeland Security as they apply to hazardous material transporters and chemical facilities.
Download Now!