Wyoming Water Quality Assessment Report
On This Page
- Wyoming Monitoring Summary
- Water Quality by Waterbody Type
- Causes of Impairment
- Probable Sources Contributing to Impairments
- TMDL Alternatives by Cause of Impairment
- Previously 303(d)-Listed Waters Now Attaining All Applicable Water Quality Standards
- Causes of Impairment for 303(d) Listed Waters
- Cumulative TMDLs by Pollutant
- Cumulative Number of TMDLs
Data are also available for these cycles:
2002
2004
2006
2008
2010
2014
Waterbody Changes from Prior Cycle
For More Information:
State Water Quality Program
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Site-specific Targeted Monitoring Summary Results
Wyoming (2012)
Description of this tableSize of Water | |||||||||||||||
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Rivers and Streams (Miles) |
Lakes, Reservoirs, and Ponds (Acres) |
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Good Waters | 15,696.9 | 12,475.2 | |||||||||||||
Previously impaired waters now attaining all uses |
32.8 | ||||||||||||||
Threatened Waters | 392.9 | ||||||||||||||
TMDL completed | |||||||||||||||
TMDL alternative | |||||||||||||||
Non-pollutant impairment | |||||||||||||||
TMDL needed | 392.9 | ||||||||||||||
Impaired Waters | 1,423.2 | 6,237.8 | |||||||||||||
TMDL completed | 82.5 | 6,075.8 | |||||||||||||
TMDL alternative | |||||||||||||||
Non-pollutant impairment | 46.3 | ||||||||||||||
TMDL needed | 1,294.4 | 162.0 | |||||||||||||
New TMDLs completed | 450.2 | 15.4 | |||||||||||||
Remaining TMDLs needed | 844.2 | 146.6 | |||||||||||||
Total Assessed Waters | 17,513.0 | 18,713.0 | |||||||||||||
Total Waters | 108,767.0 | 325,048.0 | |||||||||||||
Percent of Waters Assessed | 16.1 | 5.8 |
Summary of Water Quality Assessments for Each Waterbody Type
for Reporting Year 2012
Statewide Statistical Survey Summary Results
Wyoming Rivers and Streams 2012
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Where two or more state condition categories fall under one national category, EPA used the largest margin of error for purposes of displaying this information in the report.
Site-specific Targeted Monitoring Results
Wyoming Rivers and Streams 2012
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
Wyoming Rivers and Streams 2012
* Waters assessed for more than one designated use are included in multiple designated use groups below.
Description of this tableDesignated Use | Miles Assessed | Percent Good | Percent Threatened | Percent Impaired | % Good |
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% Threatened | |||||
% Impaired | |||||
Agriculture | 11,158.2 | 100.0 | .0 | .0 | |
Aquatic Life Other Than Fish | 16,745.2 | 94.4 | 2.1 | 3.5 | |
Cold Water Fishery | 14,758.9 | 97.1 | 1.1 | 1.9 | |
Drinking Water | 228.0 | 19.3 | .0 | 80.7 | |
Fish Consumption | 43.9 | 100.0 | .0 | .0 | |
Industry | 11,158.2 | 100.0 | .0 | .0 | |
Non-Game Fish | 170.9 | .0 | .0 | 100.0 | |
Recreation | 956.0 | .0 | 4.7 | 95.3 | |
Warm Water Fishery | 320.7 | 53.2 | .0 | 46.8 | |
Wildlife | 11,158.2 | 100.0 | .0 | .0 |
Site-specific Targeted Monitoring Results
Causes of Impairment
Wyoming Rivers and Streams 2012
Description of this table
Cause of Impairment | Cause of Impairment Group | Miles Threatened or Impaired |
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Fecal Coliform | Pathogens | 776.5 |
Selenium | Metals (other than Mercury) | 358.2 |
Sedimentation/Siltation | Sediment | 269.6 |
Escherichia Coli (E. Coli) | Pathogens | 179.5 |
Physical Substrate Habitat Alterations | Habitat Alterations | 176.3 |
Arsenic | Metals (other than Mercury) | 119.9 |
Chloride | Salinity/Total Dissolved Solids/Chlorides/Sulfates | 99.3 |
Temperature, Water | Temperature | 88.8 |
Manganese | Metals (other than Mercury) | 64.2 |
Oil and Grease | Oil and Grease | 46.7 |
Nutrient/Eutrophication Biological Indicators | Nutrients | 40.8 |
Low Flow Alterations | Flow Alteration(s) | 29.3 |
Copper | Metals (other than Mercury) | 17.3 |
Other Flow Regime Alterations | Flow Alteration(s) | 17.0 |
Ammonia, Un-ionized | Ammonia | 16.6 |
Silver | Metals (other than Mercury) | 12.4 |
Cadmium | Metals (other than Mercury) | 12.4 |
pH | pH/Acidity/Caustic Conditions | 10.0 |
Site-specific Targeted Monitoring Results
Probable Sources
Wyoming Rivers and Streams 2012
Description of this table
Probable Source | Probable Source Group | Miles Threatened or Impaired |
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Source Unknown | Unknown | 1,204.3 |
Natural Sources | Natural/Wildlife | 476.8 |
Grazing In Riparian Or Shoreline Zones | Agriculture | 370.8 |
Irrigated Crop Production | Agriculture | 306.3 |
Petroleum/Natural Gas Production Activities (Permitted) | Industrial | 170.3 |
Habitat Modification - Other Than Hydromodification | Habitat Alterations (Not Directly Related To Hydromodification) | 54.2 |
Discharges From Municipal Separate Storm Sewer Systems (Ms4) | Urban-Related Runoff/Stormwater | 44.5 |
Wildlife Other Than Waterfowl | Natural/Wildlife | 17.7 |
Rangeland Grazing | Agriculture | 17.7 |
Subsurface (Hardrock) Mining | Resource Extraction | 10.5 |
Municipal Point Source Discharges | Municipal Discharges/Sewage | 10.0 |
Urban Runoff/Storm Sewers | Urban-Related Runoff/Stormwater | 7.6 |
Impacts From Abandoned Mine Lands (Inactive) | Resource Extraction | 6.8 |
Sources Outside State Jurisdiction Or Borders | Other | 6.8 |
Site-specific Targeted Monitoring Results
Wyoming Lakes, Reservoirs, and Ponds 2012
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
Wyoming Lakes, Reservoirs, and Ponds 2012
* Waters assessed for more than one designated use are included in multiple designated use groups below.
Description of this tableDesignated Use | Acres Assessed | Percent Good | Percent Threatened | Percent Impaired | % Good |
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% Threatened | |||||
% Impaired | |||||
Agriculture | 12,475.2 | 100.0 | .0 | .0 | |
Aquatic Life Other Than Fish | 18,713.0 | 66.7 | .0 | 33.3 | |
Cold Water Fishery | 12,490.6 | 99.9 | .0 | .1 | |
Fish Consumption | 12,049.8 | 100.0 | .0 | .0 | |
Industry | 12,475.2 | 100.0 | .0 | .0 | |
Warm Water Fishery | 6,075.8 | .0 | .0 | 100.0 | |
Wildlife | 12,475.2 | 100.0 | .0 | .0 |
Site-specific Targeted Monitoring Results
Causes of Impairment
Wyoming Lakes, Reservoirs, and Ponds 2012
Description of this table
Cause of Impairment | Cause of Impairment Group | Acres Threatened or Impaired |
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Sedimentation/Siltation | Sediment | 6,091.2 |
Selenium | Metals (other than Mercury) | 146.6 |
Phosphate | Nutrients | 15.4 |
Site-specific Targeted Monitoring Results
Probable Sources
Wyoming Lakes, Reservoirs, and Ponds 2012
Description of this table
Probable Source | Probable Source Group | Acres Threatened or Impaired |
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Irrigated Crop Production | Agriculture | 6,222.4 |
Source Unknown | Unknown | 6,091.2 |
Natural Sources | Natural/Wildlife | 146.6 |
Wyoming Causes of Impairment for Reporting Year 2012
Description of this table
NOTE: Click on the underlined Cause of Impairment Group to see a list of specific state causes of impairment making up the Cause of Impairment Group. See also Pollution categories summary document (PDF) (20 pp, 557 K, About PDF) for brief, non-technical descriptions of general cause categories. | |||||||||||||||
Cause of Impairment Group | Size of Assessed Waters with Listed Causes of Impairment | ||||||||||||||
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Rivers and Streams (Miles) |
Lakes, Reservoirs, and Ponds (Acres) |
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Ammonia | 16.6 | ||||||||||||||
Flow Alteration(s) | 46.3 | ||||||||||||||
Habitat Alterations | 176.3 | ||||||||||||||
Metals (other than Mercury) | 439.7 | 146.6 | |||||||||||||
Nutrients | 40.8 | 15.4 | |||||||||||||
Oil and Grease | 46.7 | ||||||||||||||
Pathogens | 956.0 | ||||||||||||||
pH/Acidity/Caustic Conditions | 10.0 | ||||||||||||||
Salinity/Total Dissolved Solids/Chlorides/Sulfates | 99.3 | ||||||||||||||
Sediment | 269.6 | 6,091.2 | |||||||||||||
Temperature | 88.8 |
Wyoming Probable Sources Contributing to Impairments
for Reporting Year 2012
Description of this table
NOTE: Click on the underlined Probable Source Group to see a list of specific state Probable Sources making up the Probable Source Group. | |||||||||||||||
Probable Source Group | Size of Assessed Waters with Probable Sources of Impairments | ||||||||||||||
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Rivers and Streams (Miles) |
Lakes, Reservoirs, and Ponds (Acres) |
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Agriculture | 694.8 | 6,222.4 | |||||||||||||
Habitat Alterations (Not Directly Related To Hydromodification) | 54.2 | ||||||||||||||
Industrial | 170.3 | ||||||||||||||
Municipal Discharges/Sewage | 10.0 | ||||||||||||||
Natural/Wildlife | 494.5 | 146.6 | |||||||||||||
Other | 6.8 | ||||||||||||||
Resource Extraction | 17.3 | ||||||||||||||
Unknown | 1,204.3 | 6,091.2 | |||||||||||||
Urban-Related Runoff/Stormwater | 52.1 |
Wyoming TMDL Alternatives by Cause of Impairment 2012
Description of this table
NOTE: Click on the underlined "Number of TMDL Alternatives by Cause of Impairment " value to see a listing of those Causes of Impairment. | ||||||||||||||
Cause of Impairment | Number of TMDL Alternatives |
Rivers and Streams (Miles) |
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Oil and Grease | 1 | 45 |
Total: 1 TMDL Alternatives
Wyoming Previously 303(d)-Listed Waters Now Attaining All Applicable Water Quality Standards
Description of this tableNOTE: Click on the underlined "Number of Waters Attaining" value for a detailed list of those previously 303(d)-listed waters now attaining all applicable water quality standards. | ||
Year Attaining | Number of Waters Attaining | Number of Causes of Impairment Addressed |
---|---|---|
2012 | 2 | 2 |
Wyoming Causes of Impairment for 303(d) Listed Waters
Description of this tableNOTE: Click on a cause of impairment (e.g. pathogens) to see the specific state-reported causes that are grouped to make up this category. Click on the "Number of Causes of Impairment Reported" to see a list of waters with that cause of impairment. | |
Cause of Impairment Group Name | Number of Causes of Impairment Reported |
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Pathogens | 73 |
Metals (other than Mercury) | 27 |
Sediment | 7 |
Habitat Alterations | 7 |
Salinity/Total Dissolved Solids/Chlorides/Sulfates | 4 |
Temperature | 4 |
Nutrients | 3 |
pH/Acidity/Caustic Conditions | 2 |
Ammonia | 2 |
Oil and Grease | 1 |
Total: 130 Causes of Impairment
Wyoming Cumulative TMDLs by Pollutant
This chart includes TMDLs since October 1, 1995.
Description of this tableNOTE: Click on the underlined "Pollutant" value to see associated listed waters for which a TMDL was developed. Click on the underlined "Number of TMDLs" value to see a listing of those TMDLs for the pollutant. | ||
Pollutant | Number of TMDLs | Number of Causes of Impairment Addressed |
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Fecal Coliform | 82 | 84 |
Escherichia Coli (E. Coli) | 50 | 50 |
Total Residual Chlorine | 49 | 52 |
Chlorine | 48 | 48 |
Ammonia, Un-ionized | 47 | 48 |
Ammonia | 33 | 35 |
Chlorine, Residual (Chlorine Demand) | 13 | 13 |
Fecal | 12 | 12 |
Radium 226 | 8 | 11 |
Chlorides | 7 | 7 |
Iron | 5 | 5 |
Chloride | 4 | 6 |
Copper | 4 | 4 |
Radium | 4 | 4 |
Sediment | 4 | 4 |
Arsenic | 3 | 3 |
Selenium | 3 | 3 |
Zinc | 3 | 3 |
Manganese | 2 | 2 |
Pentachlorophenol (PCP) | 2 | 2 |
Phenols | 2 | 2 |
Temperature | 2 | 2 |
Cadmium | 1 | 1 |
Chromium IV | 1 | 1 |
Chromium, Total | 1 | 1 |
Nitrate | 1 | 1 |
Nitrates | 1 | 1 |
Phosphorus | 1 | 1 |
Silver | 1 | 1 |
Sulfide | 1 | 1 |
Total Dissolved Solids (TDS) | 1 | 1 |
Total: 396 TMDLs; 409 Causes of Impairment Addressed
Wyoming Cumulative Number of TMDLs
EPA Fiscal Year starts October 1 and ends September 30.
Description of this table
NOTE: Click on the underlined "Number of TMDLs Completed" value for a detailed list of the TMDLs for the fiscal year. | ||
Fiscal Year | Number of TMDLs | Number of Causes of Impairment Addressed |
---|---|---|
1997 | 83 | 84 |
1998 | 9 | 9 |
1999 | 41 | 41 |
2000 | 12 | 12 |
2001 | 10 | 10 |
2002 | 13 | 13 |
2003 | 11 | 11 |
2004 | 71 | 75 |
2005 | 39 | 39 |
2006 | 16 | 16 |
2007 | 30 | 38 |
2010 | 14 | 14 |
2011 | 4 | 4 |
2013 | 3 | 3 |
2014 | 38 | 38 |
2016 | 2 | 2 |
Total: 396 TMDLs; 409 Causes of Impairment Addressed