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Tennessee Thermal Discharges: What you need to know

Governing Law and Regulations

Water quality criteria: Rules and Regulations of the State of Tennessee (Rule) 0400-40-03-.03

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Wastewater permits: Rule 0400-40-05-.06

Regulatory Agency

Tennessee Department of Environment and Conservation (TDEC) Division of Water Resources

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. Tennessee has classified its waters into categories based on the use of the water. Each classification has its own temperature standard.

Thermal discharge limitations are also included in wastewater permits in Tennessee.

Administration and enforcement. TDEC's Division of Water Resources administers and enforces Tennessee's thermal discharge regulations.

State Requirements

WATER QUALITY CRITERIA

Rule 0400-40-03-.03

Tennessee has divided its waters into the following use categories, and each category of water has its own thermal discharge standards as detailed here:

  • Domestic water supply. The maximum water temperature change must not exceed 3°C relative to an upstream control point. The temperature of the water cannot exceed 30.5°C, and the maximum rate of change must not exceed 2°C per hour. The temperature of impoundments where stratification occurs should be measured at mid-depth or a depth of 5 feet, whichever is less. The temperature in flowing streams must be measured at mid-depth.
  • Industrial water supply. The maximum water temperature change must not exceed 3°C relative to an upstream control point. The temperature of the water cannot exceed 30.5°C, and the maximum rate of change must not exceed 2°C per hour. The temperature of impoundments where stratification occurs should be measured ...

>> Read more about Thermal Discharges

State Requirements

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Tennessee Thermal Discharges Resources

Thermal Discharges Products

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