Mississippi Wastewater Variances regulations & environmental compliance analysis

Mississippi Wastewater Variances: What you need to know

Governing Law and Regulations

Wastewater regulations: 11 Mississippi Administrative Code (Miss. Admin. Code) Part (Pt.) 6, Chapters (Ch.) 1 to 7

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Toxicity conditions: 11 Miss. Admin. Code Pt. 6. Ch. 1, Rule 1.2.6.I

Concentrated animal feeding operations (CAFOs): 11 Miss. Admin. Code Pt. 6, Ch. 1, Rule 1.1.4.C

Regulatory Agency

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

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. Mississippi has adopted by reference federal regulations for variances from effluent limitations or categorical pretreatment standards for "fundamentally different factors" under 40 CFR 125. See the national section WASTEWATER VARIANCES for federal requirements for wastewater variances.

The state also has variance procedures and conditions for buffer zone requirements for siting concentrated animal feeding operations (CAFOs) and for effluent limitation compliance schedules.

Administration and enforcement. DEQ's Office of Pollution Control administers and enforces the state's water quality program and makes variance determinations.

State Requirements


11 Miss. Admin. Code Pt. 6, Ch. 1, Rule 1.2.6.I

In Mississippi, whenever a new water-quality-based effluent limitation (WQBEL) is imposed in a NPDES permit, the permittee has up to 3 years in which to achieve compliance with the limitations. A permittee may apply to the DEQ for a variance from a compliance schedule. For more information about WQBEL processes, see the state section EFFLUENT LIMITATIONS.


11 Miss. Admin. Code Pt. 6, Ch. 1, Rule 1.1.4.C

Mississippi has specific buffer zone ...

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