Statutes, codes, and regulations
Mississippi Administrative Code
Title 11 - Mississippi Department of Environmental QualityPart 6 - Wastewater Pollution Control RegulationsChapter 1 - Mississippi Commission on Environmental Quality National Pollutant Discharge Elimination System (NPDES) Permits, Underground Injection Control (UIC) Permits, State Permits, Water Quality Based Effluent Limitations and Water Quality Certification
Subchapter 2 - Water Quality Based Effluent Limitations
Rule 11-6-1.2.5 - Special Cases

11 Miss. Code. R. 6-1.2.5

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Current through January 14, 2025
Rule 11-6-1.2.5 - Special Cases
A. Effluent Channels.
(1) The standards set forth in the State's Water Quality Standards do not apply to effluent channels.
(2) Water in effluent channels shall be maintained at a quality which shall prevent the occurrence of offensive conditions, protect public health, and allow (after mixing) maintenance of all standards applicable to all downstream waters.
B. Ephemeral Streams.

Effluent limits for ephemeral streams shall be established consistent with the State's Water Quality Standards.

(1) Discharges from a POTW must, at a minimum, meet secondary treatment requirements. Industrial discharges must at a minimum meet TBELs.
(2) Alternative methods may be utilized to determine the potential toxic effect of ammonia.
(3) Water in ephemeral streams shall be maintained at a quality which shall prevent the occurrence of offensive conditions, protect public health, and allow (after mixing) maintenance of all standards applicable to all downstream waters.
C. Dystrophic Waters.
(1) Reasonable alternatives, including but not limited to, no discharge and land application, shall be considered prior to allowing a new discharge or continuation of an existing discharge.
(2) Effluent limitations shall be set to allow a degradation of no more than 10[CENT] of the background concentration when the background dissolved oxygen is at or below the State's minimum dissolved oxygen criterion.
(3) Discharges shall not increase toxicants above background concentrations for those waters whose background exceeds the Water Quality Standards due to natural or irretrievable man-induced conditions.
D. Shellfish Waters.

Waters classified as shellfish waters are generally classified to protect commercially or recreationally harvestable shellfish resources. The Permit Board shall insure that permitted discharges are located and have effluent limits such that impacts or potential impacts on the use of shellfish waters shall be consistent with the National Shellfish Sanitation Program. For areas with existing dischargers that impact shellfish water, other alternatives may be considered.

11 Miss. Code. R. 6-1.2.5

Miss. Code Ann. §§ 49-2-1, et seq. and 49-17-1, et seq.