11 Miss. Code. R. 6-2.4
The Mississippi River is classified as Fish and Wildlife. All water quality criteria for the Fish and Wildlife classification apply but with the following additions to the criteria stated herein:
Mineral Constituents: Not to exceed the following concentrations at any time:
From Mississippi-Tennessee border to Vicksburg
Chlorides | 60 mg/l |
Sulfates | 150 mg/l |
TDS | 425 mg/l |
From Vicksburg south to the Mississippi-Louisiana border
Chlorides | 75 mg/l |
Sulfates | 120 mg/l |
TDS | 400 mg/l |
The Mississippi Sound is classified as Recreation. The waterbody runs east-west along Mississippi Coast. The Mississippi Sound is separated from the Gulf of Mexico on its southern side by the Mississippi-Alabama barrier islands. The following nickel criteria are applicable for this waterbody for the protection of aquatic life:
Acute | 167 µg/l |
Chronic | 18.5 µg/l |
The Escatawpa River is located within Jackson County in southeast Mississippi. The waterbody is located within the Pascagoula River Basin is classified as Fish and Wildlife. Sitespecific criteria for dissolved oxygen apply to a segment of the Escatawpa River from river mile 10 to its mouth at the Pascagoula River. The following dissolved oxygen standard is applicable for this segment:
Dissolved oxygen concentrations shall not be less than a daily average of 3.7 mg/l from May 1 through October 31. Additional information regarding the derivation and implementation of this criterion can be found in MDEQ the report titled, A SiteSpecific Dissolved Oxygen Criterion for the Escatawpa River: Criteria Derivation and Implementation.
Little Bywy Creek, Middle Bywy Creek, and Big Bywy Ditch are located within Choctaw and Montgomery Counties in central Mississippi. These water bodies are located within the Big Black River Basin and are all classified as Fish and Wildlife. Site-specific criteria for selenium apply to the following waterbody segments:
Little Bywy Creek: From the headwaters to its mouth at Middle Bywy Creek
Middle Bywy Creek: From its headwaters to its mouth at Big Bywy Ditch
Big Bywy Ditch: From the confluence with Middle Bywy Creek to its mouth at the Big Black River
The following selenium criteria apply for the segments listed above:
Media Type | Fish Tissue | Water Column | |
Criterion Element | Egg/Ovary | Fish Whole Body or Muscle | Monthly Average Exposure |
Magnitude | 15.1 mg/kg (dry weight) | Whole body: 8.5 mg/kg (dry weight) or Muscle: 11.3 mg/kg (dry weight) (skinless, boneless fillet) | 1.5 µg/L in lentic aquatic systems or 3.1 µg/L in lotic aquatic system |
Duration | Instantaneous | Instantaneous | 30 days |
Frequency | Not to be exceeded | Not to be exceeded | Not more than once in three years on average |
11 Miss. Code. R. 6-2.4