David Waterstreet, Program ManagerWatershed Program307-777-6709
Clean Water Act (CWA) Section 401 Certification and Turbidity Waivers  
Eric Hargett (Cheyenne)CWA Section 401 Certification, Turbidity Waivers307-777-6701
Data Quality Assurance and Quality Control (QA/QC)  
Jillian Scott (Cheyenne)Data QA/QC307-777-6372
Nonpoint Source Pollution Program  
Alexandria Jeffers (Cheyenne)Nonpoint Source Program307-777-6733
Surface Water Monitoring Program  
Jeremy Zumberge, Program Supervisor (Sheridan)Surface Water Monitoring Program307-675-5638
Tavis Eddy (Lander)Surface Water Monitoring Program307-335-6957
Eric Hargett (Cheyenne)Surface Water Monitoring Program307-777-6701
Jason Martineau (Sheridan)Surface Water Monitoring Program307-675-5632
Triston Rice (Cheyenne)Surface Water Monitoring Program307-777-6353
Chad Rieger (Sheridan)Surface Water Monitoring Program307-675-5637
Michael Wachtendonk (Lander)Surface Water Monitoring Program307-335-6751
Surface Water Quality Standards  
Lindsay Patterson, Program Supervisor (Cheyenne)Surface Water Quality Standards307-777-7079
Kelsee Hurschman (Cheyenne)Surface Water Quality Standards, Harmful Cyanobacterial Blooms307-777-2073
Madeleine Hamel (Cheyenne)Surface Water Quality Standards, National Environmental Policy Act (NEPA)307-777-7050
Total Maximum Daily Load (TMDL) Program  
Ron Steg, Program Lead (Lander)Total Maximum Daily Load (TMDL)307-335-6980
Bret Callaway (Cheyenne)Total Maximum Daily Load (TMDL)307-777-5802
Water Quality Lab  
Steve Vien, Lab Supervisor (Cheyenne)Water Quality Lab307-777-7654
Alexandra Cook (Cheyenne)Water Quality Lab307-777-7151
Marisa Latady (Cheyenne)Water Quality Lab307-777-6783
Vacant (Cheyenne)Water Quality Lab307-777-3770

This page is under development.


Rules and Regulations

All official Wyoming State Rules and Regulations are kept at the Wyoming Secretary of State's Office. Click here to view all current Rules and Regulations. 

40 CFR section 130.7 – Total maximum daily loads (TMDL) and individual water quality-based effluent limitations.


Completed TMDL Documents

This page contains links to all of the completed and approved TMDL documents.  Links to TMDLs for individual waterbody segments are provided in the interactive TMDL and Assessment Map.

Ongoing Projects

This page is under development.



Interactive Map

The TMDL and Assessment web map complements Wyoming’s 2020 Integrated 305(b) and 303(d) Report.  This tool is intended to provide efficient, point-and-click access to summary information about each of Wyoming’s assessed lakes and streams.  A pop-up box will appear upon selecting (i.e., pointing and clicking)  a waterbody that includes summary information about the assessed waterbody and a link to a one-page fact sheet.  Each fact sheet includes a link to the WDEQ’s complete assessment report and TMDL documents for the selected waterbody (if they are available for that waterbody).  For additional information, contact Ron Steg at (307) 335-6980 or

Related Programs

States are required to develop total maximum daily load (TMDL) pollutant levels for waterways that are not adequately meeting federal Clean Water Act water quality standards. 

What is a Total Maximum Daily Load (TMDL)?

TMDLs are a requirement of Section 303(d) of the Clean Water Act (CWA).  According to the CWA, each state must develop TMDLs for all the waters identified on their Section 303(d) list of impaired waters.   A TMDL is a calculation of the maximum amount of a pollutant that a waterbody can receive while still meeting water quality standards.  An overview of TMDLs is provided on EPA’s website.

Simply, a TMDL is a plan to achieve water quality standards for impaired waterbodies.

In general, states are responsible for developing TMDLs and submitting them to EPA for approval. Even if third parties assist in the development of the TMDL or its supporting analysis, such TMDLs must still be submitted to EPA by the states.

Under the CWA, the EPA reviews and either approves or disapproves the TMDL. If EPA disapproves a state TMDL, EPA must develop a replacement TMDL.

The Process

The TMDL Program coordinates with several other DEQ programs including the Monitoring, Assessment, Permitting, and Nonpoint Source Programs to accomplish water quality restoration goals in Wyoming.   TMDLs are one step in the “water quality restoration pipeline”.


The process begins when a waterbody is placed on the 303(d) list due to an exceedance of one or more water quality standards.  Once an impaired water is placed on the 303(d) list, water quality restoration planning begins. 


The TMDL is the planning step in the process where sources of pollution to streams, rivers, and lakes within Wyoming are identified and it is determined by how much pollution those waters can sustain and still fully support beneficial uses.  


TMDLs are not self-implementing.  Rather, TMDLs are implemented through existing regulatory and non-regulatory drivers.  Point sources of pollution are addressed through the Wyoming Pollution Discharge and Elimination System (WYPDES) permit program.  Federal regulations require that discharge permit limits be consistent with the assumptions and requirements of any available wasteload allocation in approved TMDLs (40 CFR 122.44(d)(1)(vii)(B)).  Non-point sources load reduction actions are implemented through a wide variety of programs at the state, local and federal level. These programs may be regulatory, non-regulatory or incentive-based (e.g., a cost-share program).  Wyoming works closely with conservation districts and watershed stakeholders through voluntary actions, often with support from Wyoming’s Nonpoint Source Program using Clean Water Act Section 319 and 205(j) grant funds for projects aimed at reducing the nonpoint source pollution.

Monitoring and Adaptive Management

Follow-up monitoring to examine water quality trends over time, and BMP effectiveness monitoring to evaluate the efficacy of implemented best management practices, are important components of the process.  Achieving the ultimate goal of meeting the applicable water quality standards often takes many years and follow-up monitoring data can both facilitate and inform adaptive management actions, and track progress over time.  Much of the follow-up monitoring in Wyoming is conducted by watershed stakeholders with technical support provided by WDEQ.