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Water Quality Division > Programs > TMDLs & Water Quality Modeling

TMDLs & Water Quality Modeling

DEQ manages the Total Maximum Daily Load program for the State of Oklahoma. A TMDL is the process of establishing the sources of impairment in a given waterbody, whether from point sources (discharges) or non-point sources (runoff), determining the amount of reduction necessary to meet water quality standards in that waterbody, and allocating the loads to the various contributors of pollution. A margin of safety is also included in the TMDL calculation process.

Water-quality modeling is the linkage between the sources of pollution and the instream water quality of a given waterbody. A model is a representation of the water-quality processes that occur in a given waterbody.

Water-quality modeling can be resource-intensive. Different levels of complexity may be used depending on the level of confidence required in a given situation.


For questions about TMDLs & Water Quality Modeling, please contact Mark Derichsweiler.


What's New

2014 Chlorophyll-a TMDLs for Copan Lake and Lake Claremore
Public Notice | Draft TMDL Report
25 July 2014

2014 Mineral TMDLs for the Beaver River Study Area
Public Notice | Draft TMDL Report
21 July 2014

2014 Lower North Canadian/Deep Fork River Study Area Bacterial and Turbidity TMDLs
Public Notice | Draft TMDL Report
10 July 2014

2014 Arkansas River North Canadian River Study Area Bacterial and Turbidity TMDLs
Public Notice | Draft TMDL Report
8 July 2014

2014 Lower Neosho Watershed Area Bacterial and Turbidity TMDLs
Public Notice | Final TMDL Report | 208 Factsheet
17 June 2014

Bacterial and Turbidity TMDLs in the Lower Arkansas River Basin Study Area
Public Notice | Final TMDL Report | 208 Factsheet
17 June 2014

2014 Bacterial and Turbidity TMDLs in the Lower Red River/Little River Basin Study Area
Public Notice | Draft TMDL Report
3 Feb 2014

Lake Thunderbird Nutrient, Turbidity, and Dissolved Oxygen TMDLs
Lake Thunderbird TMDL Project Page | TMDL 208 Factsheet | Final TMDL Report | Appendix H of Final Report | Response to Comments | EPA approval letter for the Lake Thunderbird TMDLs
13 Nov 2013

Rush Creek Mineral TMDL
TMDL 208 Factsheet | Final TMDL Report | Public Notice
06 Sep 2013

Chlorophyll-a TMDLs in Lake Lawtonka, Waurika Lake, and Lake Ellsworth
TMDL 208 Factsheet | Final TMDL Report | Public Notice
03 Sep 2013

Verdigris-Neosho Area Watershed Bacterial and Turbidity TMDL
Public Notice | Final TMDL Report
08 Aug 2012

Cimarron River Bacterial and Turbidity TMDL
Public Notice | Final TMDL Report
01 Aug 2012

Arkansas-Verdigris Area Watershed Bacterial and Turbidity TMDL
Public Notice | Final TMDL Report
01 Aug 2012

Muddy Boggy Bacterial and Turbidity TMDL
Public Notice | Final TMDL Report
26 Jul 2012

Red River Bacterial and Turbidity TMDL
Public Notice | Final TMDL Report
11 Jul 2012

Washita River Study Area Bacterial TMDL
Public Notice | Final TMDL Report
07 Jul 2012

Guthrie Lake and Liberty Lake Chlorophyll-a TMDL
Public Notice | Final TMDL Report | Final TMDL Appendices
10 May 2012

Rocky Lake and Tom Steed Lake Chlorophyll-a
Final TMDL Report
13 Sep 2011

Lower Deep Fork Bacteria and Turbidity
Final TMDL Report
12 Sep 2011

Upper Deep Fork Bacteria and Turbidity
Final TMDL Report
9 Sep 2011

Salt Fork Turbidity & Bacteria TMDL
Final TMDL Report
31 Aug 2011

Middle Cimarron Turbidity & Bacteria TMDL
Final TMDL Report
23 Aug 2011

Lower North Canadian Turbidity & Bacteria TMDL
Public Notice | Final TMDL Report
31 May 2011

Lower Bird Creek Area Bacteria TMDL
Public Notice | Final TMDL Report
16 May 2011

Upper Cimarron River Bacteria TMDL
Public Notice | Final TMDL Report
2 May 2011

Illinois River Watershed/TMDL Project Public Meeting
15 Dec 2010

Beaver River Final Bacteria & Turbidity TMDL
8 Sep 2010

Caney River Final TMDL
8 Sep 2010

Black Bear Creek Final TMDL
31 Aug 2010

Red River Final TMDL
Part 1 | Part 2
31 Aug 2010

Sulphur Creek Final TMDL
31 Aug 2010

Washita River Final TMDL
31 Aug 2010

Bird Creek Bacteria Final TMDL Report Adobe Acrobat 5.0 PDF Document
23 Aug 2010

Salt Creek Turbidity TMDL
Final TMDL Report Adobe Acrobat 5.0 PDF Document
24 May 2010

Skeleton Creek - Cimarron River Area Turbidity TMDL
Final TMDL Report Adobe Acrobat 5.0 PDF Document
19 Apr 2010

North Canadian River Area Bacteria TMDL Report Adobe Acrobat 5.0 PDF Document
6 Apr 2010

North Canadian (Oklahoma River) Bacteria TMDL Public Meeting Rescheduled Adobe Acrobat 5.0 PDF Document
29 Sep 2009

Eucha Lake and Spavinaw Creek TMDL
Final TMDL Report
23 Sep 2009

Salt Creek and Sand Creek Bacteria TMDLs
Final TMDL Report
23 Sep 2009

Lower Cimarron River and Skeleton Creek TMDL
Final TMDL Report
23 Sep 2009

North Canadian River Bacteria TMDL
Public Notice | Draft TMDL Report
29 Jul 2009

Bacteria TMDLs for the Arkansas River Near Tulsa and Haikey Creek
13 Oct 2008

Canadian River Area Final TMDL
18 Sep 2008

Bacteria TMDLs for the Neosho River Basin Report
June 2008

Upper Red River Bacteria TMDLs Report
June 25, 2008

Lower Red River Watershed Pathogen TMDL Final Report
11 Dec 2007

Washita River Watershed Pathogen TMDL Final Report
11 Dec 2007

Boggy Creek Watershed Pathogen TMDL Final Report
11 Dec 2007

Little River Watershed Pathogen TMDL Final Report
11 Dec 2007


TMDL Guide Adobe Acrobat 5.0 PDF Document