Arkansas Total Maximum Daily Loads (TMDL)

Under section 303(d) of the Clean Water Act, ADEQ is required to develop a list of impaired waters – those waters not meeting water quality standards, APC&EC Regulation 2.

Some of the state’s impaired waterways on the 303(d) list are tapped for corrective action to improve their water quality. Some require the development of a TMDL – Total Maximum Daily Load.

A TMDL is a calculation developed for some waters that are not meeting or are at risk of not attaining water quality standards. The TMDL calculates the maximum amount of a constituent a waterbody can receive and still meet the standards.

A TMDL accounts for both point source and nonpoint source discharges.

Calculations are performed by various models that predict safe levels of contaminants based on worst-case conditions and providing a margin of safety. The calculated safe amounts then may be allocated to point source discharges as a wasteload allocation and to nonpoint sources as a load allocation. This constitutes a TMDL. Permit limits are set according to a stream’s TMDL.

TMDL Prioritization

The Arkansas Department of Environmental Quality (ADEQ) created a "Long-Term Vision for Assessment, Restoration, and Protection under the Clean Water Act (CWA) 303(d) Program" (4/17/2015) in accordance with the new measures set forth by the United States Environmental Protection Agency (EPA).

ADEQ has been working in conjunction with the Arkansas Natural Resources Commission (ANRC) to target resources for water quality improvements within the state. The ANRC is responsible for developing and implementing Arkansas’ Nonpoint Source Pollution Management Program. ANRC prioritized ten basins in Arkansas using stakeholder involvement coupled with a science-based process. For TMDL prioritization, nine of the ten ANRC basins were chosen because they have impairments that carry from ADEQ’s 2008 303(d) list to the Draft 2014 303(d) list. ADEQ plans to work towards TMDL or alternative plan development for the currently selected basins by 2022.

Arkansas Total Maximum Daily Loads (TMDLs)

Draft TMDLs at Public Notice

Search for draft TMDLs issued by ADEQ’s Water Division.

Review the draft document and find the dates marking the beginning and end of each draft’s public comment period.

Final TMDLs

Below is a list of final TMDLs issued by ADEQ.

ADEQ’s draft TMDL calculations must be approved by the EPA, which has developed some Arkansas TMDLs itself in response to court orders or upon requests from states.

Water Body TMDL Date Pollutant(s) Planning Segment
Recs Found: 119
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Bayou Bartholomew   10/08/2002  Turbidity  2B
Bayou Bartholomew   12/18/2002  Mercury in Fish Tissue  2B
Bayou Bartholomew   6/01/2007  Pathogens  2B
Bayou Bartholomew   3/31/2008  Chloride, Sulfate, TDS  2B
Bayou DeView   1/06/2006  Turbidity  4B
Bayou Dorcheat   12/10/2002  Mercury in Fish Tissue  1A
Bayou Macon   3/03/2005  Turbidity  2A
Bear Creek Lake   1/16/2007  Nutrient  5B
Bearhouse Creek   6/01/2007  Pathogens  2B
Beech Creek    9/27/2012  Dissolved Oxygen, Lead, & Turbidity   1A
Big Bayou   3/03/2005  Turbidity, Chloride  2A
Big Cornie Creek   8/01/2011  Sulfate  2E
Big Creek   3/27/2008  Turbidity  2C
Big Creek near Sheridan   1/16/2007  Dissolved Oxygen  2C
Big Creek near Sheridan   3/21/2008  Turbidity  2C
Big Creek    9/27/2012  Chloride, Lead, pH, Sulfate, & TDS   1A
Big Johnson Lake   5/25/2004  Mercury in Fish Tissue  2D
Blackfish Bayou   3/27/2008  Turbidity  5A
Bodcau Creek    9/27/2012  Copper, Lead, pH, & Turbidity   1A
Boeuf River   3/03/2005  Turbidity, Chloride, Sulfate, TDS  2A
Bull Shoals (White River) Tailwaters   5/01/2009  Dissolved Oxygen  4I
Cache River   1/06/2006  Turbidity  4B
Caddo River   3/21/2008  Copper, Zinc  2F
Cadron Creek   1/05/2006  Turbidity  3D
Caney Creek   6/01/2007  Pathogens  4G
Champagnolle Creek   12/18/2002  Mercury in Fish Tissue  2D
Chemin-A-Haut Creek   6/01/2007  Pathogens  2B
Clear Creek   9/01/2009  Pathogens  3J
Cooper Creek   6/01/2007  Pathogens  4G
Cove Creek Lake   12/10/2002  Mercury in Fish Tissue  3H
Cross Bayou   6/01/2007  Pathogens  2B
Cutoff Creek   12/18/2002  Mercury in Fish Tissue  2B
Cutoff Creek   3/31/2008  Turbidity  2B
Cypress Bayou   9/01/2009  Pathogens  4D
Days Creek   12/23/2005  Nitrate  1B
Deep Bayou   10/08/2002  Turbidity  2B
Deep Bayou   6/01/2007  Pathogens  2B
Dorcheat Bayou    9/27/2012  Lead, pH, Sulfate   1A
Dota Creek   6/01/2007  Pathogens  4G
Dry Fork Lake   12/10/2002  Mercury in Fish Tissue  3E
ELCC Tributary   10/03/2002  Chloride, Sulfate, TDS, Ammonia  2D
Felsenthal National Wildlife Refuge   12/18/2002  Mercury in Fish Tissue  2D
First Old River Lake   1/16/2007  Nutrient  1B
Flat Creek   10/08/2003  Chloride, Sulfate, TDS  2D
Fourche La Fave River   12/10/2002  Mercury in Fish Tissue  3E
Grand Lake   1/16/2007  Nutrient  2A
Grays Lake   5/25/2004  Mercury in Fish Tissue  2C
Harding Creek   6/01/2007  Pathogens  2B
Hicks Creek   5/24/2001  Nitrate  4F
Holly Creek   1/07/2008  Pathogens  1C