Mississippi Administrative Code › Title 11 - Mississippi Department of Environmental Quality › Part 6 - Wastewater Pollution Control Regulations › Chapter 9 - Mississippi Commission on Environmental Quality, Mississippi 2024 Section 303(d) List of Impaired Water Bodies › Rule 11-6-9.5 - LAYOUT OF THE TABLES

Current through June 25, 2024
A.
Stream
				Listings
The impaired waters in Tables 3-5 below are sorted
				  alphabetically by the river basin then by the water body name. The extent of
				  the segment is described beginning with the upstream boundary thence to the
				  downstream boundary. The maps of these segments are located in Appendix
				  A.
B.
Pollutants
				Included
The pollutants are listed specifically for each listing.
				  There are 241 listings for 2024. Biological Impairment is listed 223 times
				  (92.5%). This listing is generated based on assessing the result of our benthic
				  sampling program M-BISQ.
When the water body is scored below the eco-regional value,
				  it is added to the impaired waters list. A stressor identification process is
				  then used to identify the specific pollutants causing the microbiological
				  impairment. Organic Enrichment, Total Nitrogen, and Total Phosphorus listings
				  are for excessive nutrients or organics which impact the dissolved oxygen and
				  eutrophication in the water body. The pH listings are from water monitoring
				  results which are outside of the water quality criteria for pH. If there are
				  multiple pollutants and/or uses for a water body, these are shown as multiple
				  listings for the water body.
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C.
Pollutant Source
Due to the nature of the monitoring and listings for 2024,
				  the source of the impairment is generally not known. For the biological
				  listings a stressor identification process is required to identify probable
				  primary stressors. Once identified, these probable primary stressors are
				  incorporated into the §303(d) List and the biological impairment listing
				  is removed.
D.
Water
				Body Identification Numbers
MDEQ and USGS completed work on the new 12-digit
				  watershed-based delineation of Mississippi in 2005. MDEQ incorporated this new
				  delineation into the identification numbering system for water body segments in
				  the states beginning with the 2006 §305(b) report. Each listed water body
				  segment is identified by a six-digit numeric code. The first digit identifies
				  which basin contains the water body. The major river basins are numbered 1
				  through 9 in alphabetical order (1 for the Big Black River Basin, 2 for the
				  Coastal Streams Basin, through 9 for the Yazoo Basin.) [See map on page 4.] The
				  next three digits in the six-digit water body identification number refer to
				  the specific subwatershed within that basin. Each major river basin has the
				  subwatersheds it contains numbered beginning with 1 (subwatershed 146 located
				  in the Big Black River Basin would be numbered 1146, subwatershed 74 located in
				  the Pascagoula River Basin would be numbered 4074.) The final two digits in the
				  six-digit water body identification number refer to a specific stream segment
				  within the specified subwatershed. For instance, Beaver Creek, water body ID
				  521413, is stream segment 13 in subwatershed 214 in the Pearl River
				  Basin.
E.
Basin
				Maps
Maps are included in Appendix A for each basin. Streams shown
				  in blue are the impaired stream segments. In some river basins, the maps were
				  split into 8-digit Hydrologic Unit Codes to better fit the page.
Miss. Code
				  Ann. §§
										49-2-1, et seq. and 49-17-1, et
				  seq.