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
Exhibit 11-6-1-2-B to Chapter 1, Subchapters 1 and 2 - DISINFECTION REQUIREMENTS FOR SANITARY SEWAGE

Miss. Code. tit. 11, pt. 6, ch. 1, subch. 2, exh. 11-6-1-2-B to Chapter 1, Subchapters 1 and 2

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Current through January 14, 2025
Exhibit 11-6-1-2-B to Chapter 1, Subchapters 1 and 2 - DISINFECTION REQUIREMENTS FOR SANITARY SEWAGE
I. DISCHARGE TO WATERS CLASSIFIED PUBLIC WATER SUPPLY.

Disinfection shall be required regardless of the quantity of receiving water for discharges to or within close proximity, both in distance and travel time, to public water supply waters.

II. DISCHARGES TO WATERS CLASSIFIED RECREATION AND TO WATERS OF OTHER CLASSIFICATIONS WITH KNOWN RECREATIONAL SITES.

Disinfection shall be required regardless of the quantity of receiving water.

III. DISCHARGES TO WATERS CLASSIFIED SHELLFISH HARVESTING.
1. Disinfection shall be required for discharges to or within one tidal cycle of approved or conditionally approved shellfish harvesting areas.
2. Disinfection shall be required for discharges within close proximity to closed shellfish harvesting areas, if, after mixing at the most unfavorable hydrographic and pollutional conditions, the geometric mean concentration of fecal coliform is expected to exceed 14 colonies per 100 ml.
IV. DISCHARGES TO WATERS CLASSIFIED FISH AND WILDLIFE.
1. Disinfection shall be required for discharges to or within close proximity, both in distance and/or travel time, to waters with known recreational sites regardless of the quantity of receiving water.
2. Disinfection shall be required for discharges to or within close proximity to public water supply waters, if, after mixing at the most unfavorable hydrographic and pollutional conditions (normally the 7Q10 low flow), the geometric mean concentration of fecal coliform is expected to exceed 200 colonies per 100 ml.
3. Disinfection shall be required for discharges to or within close proximity to fish and wildlife waters, if, after mixing at the most unfavorable hydrographic and pollutional conditions (normally the 7Q10 low flow), the geometric mean concentration of fecal coliform is expected to exceed 200 colonies per 100 ml during May through October and 2000 colonies per 100 ml from November through April.
V. DISCHARGES TO WATERS CLASSIFIED EPHEMERAL.

Disinfection shall be required where the probability of a public health hazard or other circumstances so warrant.

VI. CONSISTENCY WITH WATER QUALITY STANDARDS

Notwithstanding the above, disinfection requirements for sanitary sewage shall be protective of water quality standards.

Miss. Code. tit. 11, pt. 6, ch. 1, subch. 2, exh. 11-6-1-2-B to Chapter 1, Subchapters 1 and 2