Mississippi Thermal Discharges: What you need to know

Governing Law and Regulations

Thermal discharges: 11 Mississippi Administrative Code Part 6, Chapter 2 (Miss. Admin. Code Pt. 6, Ch. 2), Rule 2.2.E

Regulatory Agencies
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Mississippi Department of Environmental Quality (DEQ) Office of Pollution Control

U.S. Environmental Protection Agency (EPA) Region 4

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. Mississippi regulates the water temperature of the state's streams, rivers, lakes, and reservoirs, and the discharges to these waters under its general water quality standards. The state also requires that temperature be based on water usage. See the state section NPDES PERMIT for more information on water quality standards and the national section THERMAL DISCHARGES for information on the federal thermal limitations.

Administration and enforcement. DEQ's Office of Pollution Control administers and enforces the state's water quality program, including thermal discharge requirements.

State Requirements


11 Miss. Admin. Code Pt. 6, Ch. 2, Rule 2.2.E

Mississippi provides water temperature standards as minimum conditions of water quality and also provides a set of standards based on usage. The maximum temperature rise above natural temperatures cannot exceed 5°F in streams, lakes, and reservoirs. Also, the maximum water temperature cannot exceed 90°F, except in the Tennessee River, where the temperature cannot exceed 86°F.

In lakes and reservoirs, there cannot be any withdrawals from or discharge of heated waters to the "hypolimnion" unless it can be shown that such discharge will be beneficial to water quality.

Note: The hypolimnion, in certain ...

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State Requirements

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Mississippi Thermal Discharges Resources

Thermal Discharges Products

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