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- Arizona Assessment Summary
- Water Quality by Waterbody Type
- Causes of Impairment
- Probable Sources Contributing to Impairments
- Previously Impaired Waters Now Attaining All Uses
- TMDL Alternatives by Cause of Impairment
- Causes of Impairment for 303(d) Listed Waters
- Cumulative TMDLs by Pollutant
- Cumulative Number of TMDLs
Data are also available for these years: 2002
Waterbody Changes from Prior Cycle
Comparison Summary by Reporting Year
For More Information:
Arizona 2004 Water Quality Assessment Report
Assessed Waters of Arizona by Watershed
Search for a Waterbody within Arizona
Arizona Assessment Summary for Reporting Year 2004
Description of this table| Size of Water | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rivers and Streams (Miles) |
Lakes, Reservoirs, and Ponds (Acres) |
||||||||||||||
| Good Waters | 1,403.1 | 43,950.0 | |||||||||||||
| Previously impaired waters now attaining all uses |
|||||||||||||||
| Threatened Waters | |||||||||||||||
| TMDL completed | |||||||||||||||
| TMDL alternative | |||||||||||||||
| Non-pollutant impairment | |||||||||||||||
| TMDL needed | |||||||||||||||
| Impaired Waters | 784.0 | 6,976.6 | |||||||||||||
| TMDL completed | 177.2 | 615.0 | |||||||||||||
| TMDL alternative | 6.0 | ||||||||||||||
| Non-pollutant impairment | |||||||||||||||
| TMDL needed | 600.8 | 6,361.6 | |||||||||||||
| New TMDLs completed | .0 | .0 | |||||||||||||
| Remaining TMDLs needed | 600.8 | 6,361.6 | |||||||||||||
 |
|||||||||||||||
| Total Assessed Waters | 2,187.1 | 50,926.6 | |||||||||||||
| Total Waters | 90,375.0 | 335,590.0 | |||||||||||||
| Percent of Waters Assessed | 2.4 | 15.2 | |||||||||||||
Summary of Water Quality Assessments for Each Waterbody Type
for Reporting Year 2004
Arizona Assessed Waters
Summary of Water Quality Attainment for Rivers and Streams
Reporting Year 2004
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Arizona Assessed Waters
Designated Use Support for Rivers and Streams
Reporting Year 2004*
* Waters assessed for more than one designated use are included in multiple designated use groups below.
Description of this table| Designated Use | Miles Assessed | Percent Good | Percent Threatened | Percent Impaired |  % Good |
|---|---|---|---|---|---|
 % Threatened |
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 % Impaired |
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| Agricultural Irrigation | 1,105.3 | 96.0 | .0 | 4.0 | |
| Agricultural Livestock Watering | 1,697.1 | 97.9 | .0 | 2.1 | |
| Aquatic And Wildlife (Coldwater Fishery) | 342.9 | 42.2 | .0 | 57.8 | |
| Aquatic And Wildlife (Effluent Dependent Water) | 32.8 | 54.3 | .0 | 45.7 | |
| Aquatic And Wildlife (Ephemeral) | 33.3 | .0 | .0 | 100.0 | |
| Aquatic And Wildlife (Warmwater Fishery) | 946.9 | 58.3 | .0 | 41.7 | |
| Domestic Water Source | 257.3 | 100.0 | .0 | .0 | |
| Fish Consumption | 1,779.8 | 93.8 | .0 | 6.2 | |
| Full Body Contact | 1,418.5 | 92.0 | .0 | 8.0 | |
| Partial Body Contact | 94.9 | 64.7 | .0 | 35.3 | |
Arizona Causes of Impairment
for Threatened and Impaired Rivers and Streams
Reporting Year 2004
Description of this table
| Cause of Impairment | Cause of Impairment Group | Miles Threatened or Impaired |
|---|---|---|
| Copper | Metals (other than Mercury) | 214.7 |
| Selenium | Metals (other than Mercury) | 203.9 |
| Turbidity | Turbidity | 106.5 |
| Escherichia Coli (E. Coli) | Pathogens | 99.1 |
| DDT | Pesticides | 98.9 |
| Toxaphene | Pesticides | 98.9 |
| Chlordane | Pesticides | 98.9 |
| Solids (Suspended/Bedload) | Sediment | 84.5 |
| Zinc | Metals (other than Mercury) | 81.4 |
| Cadmium | Metals (other than Mercury) | 58.5 |
| Dissolved Oxygen | Organic Enrichment/Oxygen Depletion | 50.2 |
| pH | pH/Acidity/Caustic Conditions | 44.0 |
| Mercury | Mercury | 34.6 |
| Boron | Toxic Inorganics | 33.6 |
| Sedimentation/Siltation | Sediment | 25.1 |
| Lead | Metals (other than Mercury) | 21.0 |
| Silver | Metals (other than Mercury) | 17.4 |
| Nitrogen, Total | Nutrients | 16.6 |
| Nitrates | Nutrients | 15.5 |
| Chlorine | Chlorine | 6.2 |
| Ammonia, Un-ionized | Ammonia | 6.2 |
| Arsenic | Metals (other than Mercury) | 3.0 |
| DDE | Pesticides | 2.3 |
Arizona Probable Sources of Impairments
for Threatened and Impaired Rivers and Streams
Reporting Year 2004
Description of this table
| Probable Source | Probable Source Group | Miles Threatened or Impaired |
|---|---|---|
| Natural Sources | Natural/Wildlife | 622.1 |
| Rangeland Grazing | Agriculture | 267.5 |
| Source Unknown | Unknown | 252.5 |
| Impacts From Abandoned Mine Lands (Inactive) | Resource Extraction | 187.3 |
| Mine Tailings | Resource Extraction | 179.6 |
| Sources Outside State Juristiction Or Borders | Other | 161.8 |
| Irrigated Crop Production | Agriculture | 127.2 |
| Impacts From Hydrostructure Flow Regulation/Modification | Hydromodification | 112.4 |
| Other Recreational Pollution Sources | Recreation And Tourism (Non-Boating) | 60.0 |
| Mill Tailings | Industrial | 49.1 |
| Golf Courses | Recreation And Tourism (Non-Boating) | 39.1 |
| Loss Of Riparian Habitat | Habitat Alterations (Not Directly Related To Hydromodification) | 39.1 |
| Post-Development Erosion And Sedimentation | Hydromodification | 38.6 |
| Woodlot Site Management | Silviculture (Forestry) | 37.1 |
| Municipal Point Source Discharges | Municipal Dishcarges/Sewage | 35.6 |
| On-Site Treatment Systems (Septic Systems And Similar Decencentralized Systems) | Municipal Dishcarges/Sewage | 31.5 |
| Wildlife Other Than Waterfowl | Natural/Wildlife | 27.5 |
| Atmospheric Depositon - Toxics | Atmospheric Deposition | 20.2 |
| Contaminated Sediments | Legacy/Historical Pollutants | 20.2 |
| Subsurface (Hardrock) Minining | Resource Extraction | 15.6 |
| Illegal Dumping | Spills/Dumping | 15.5 |
| Cercla Npl (Superfund) Sites | Legacy/Historical Pollutants | 15.5 |
| Livestock (Grazing Or Feeding Operations) | Agriculture | 7.4 |
| Municipal (Urbanized High Density Area) | Urban-Related Runoff/Stormwater | 6.2 |
| Pipeline Breaks | Spills/Dumping | 6.2 |
| Sanitary Sewer Overflows (Collection System Failures) | Municipal Dishcarges/Sewage | 6.2 |
| Unpermitted Discharge (Domestic Wastes) | Municipal Dishcarges/Sewage | 6.0 |
Arizona Assessed Waters
Summary of Water Quality Attainment for Lakes, Reservoirs, and Ponds
Reporting Year 2004
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Arizona Assessed Waters
Designated Use Support for Lakes, Reservoirs, and Ponds
Reporting Year 2004*
* Waters assessed for more than one designated use are included in multiple designated use groups below.
Description of this table| Designated Use | Acres Assessed | Percent Good | Percent Threatened | Percent Impaired | % Good |
|---|---|---|---|---|---|
| % Threatened |
|||||
| % Impaired |
|||||
| Agricultural Irrigation | 44,112.0 | 99.1 | .0 | .9 | |
| Agricultural Livestock Watering | 45,788.0 | 95.8 | .0 | 4.2 | |
| Aquatic And Wildlife (Coldwater Fishery) | 1,152.0 | .0 | .0 | 100.0 | |
| Aquatic And Wildlife (Warmwater Fishery) | 2,051.0 | 11.9 | .0 | 88.1 | |
| Domestic Water Source | 40,692.0 | 100.0 | .0 | .0 | |
| Fish Consumption | 49,948.6 | 88.8 | .0 | 11.2 | |
| Full Body Contact | 2,139.0 | 10.3 | .0 | 89.7 | |
| Partial Body Contact | 15.0 | .0 | .0 | 100.0 | |
Arizona Causes of Impairment
for Threatened and Impaired Lakes, Reservoirs, and Ponds
Reporting Year 2004
Description of this table
| Cause of Impairment | Cause of Impairment Group | Acres Threatened or Impaired |
|---|---|---|
| Mercury | Mercury | 5,332.6 |
| pH | pH/Acidity/Caustic Conditions | 2,133.0 |
| Ammonia, Un-ionized | Ammonia | 1,456.0 |
| Dissolved Oxygen | Organic Enrichment/Oxygen Depletion | 1,180.0 |
| Nitrogen, Total | Nutrients | 395.0 |
| Chlordane | Pesticides | 285.0 |
| DDT | Pesticides | 285.0 |
| Toxaphene | Pesticides | 285.0 |
| Phosphorus, Elemental | Nutrients | 230.0 |
| Phosphorus, Total | Nutrients | 15.0 |
| Aquatic Plants - Native | Nuisance Native Species | 15.0 |
| Escherichia Coli (E. Coli) | Pathogens | 13.0 |
Arizona Probable Sources of Impairments
for Threatened and Impaired Lakes, Reservoirs, and Ponds
Reporting Year 2004
Description of this table
| Probable Source | Probable Source Group | Acres Threatened or Impaired |
|---|---|---|
| Natural Sources | Natural/Wildlife | 4,459.0 |
| Atmospheric Depositon - Toxics | Atmospheric Deposition | 3,918.6 |
| Source Unknown | Unknown | 3,796.0 |
| Impacts From Abandoned Mine Lands (Inactive) | Resource Extraction | 3,592.6 |
| Internal Nutrient Recycling | Natural/Wildlife | 2,746.0 |
| Mine Tailings | Resource Extraction | 1,464.0 |
| Subsurface (Hardrock) Minining | Resource Extraction | 1,414.0 |
| On-Site Treatment Systems (Septic Systems And Similar Decencentralized Systems) | Municipal Dishcarges/Sewage | 505.0 |
| Other Recreational Pollution Sources | Recreation And Tourism (Non-Boating) | 440.0 |
| Post-Development Erosion And Sedimentation | Hydromodification | 415.0 |
| Impacts From Hydrostructure Flow Regulation/Modification | Hydromodification | 400.0 |
| Residential Districts | Urban-Related Runoff/Stormwater | 295.0 |
| Irrigated Crop Production | Agriculture | 285.0 |
| Rangeland Grazing | Agriculture | 230.0 |
| Municipal (Urbanized High Density Area) | Urban-Related Runoff/Stormwater | 187.0 |
| Construction Stormwater Discharge (Permitted) | Construction | 185.0 |
| Site Clearance (Land Development Or Redevelopment) | Construction | 185.0 |
| Contaminated Sediments | Legacy/Historical Pollutants | 185.0 |
| Woodlot Site Management | Silviculture (Forestry) | 120.0 |
| Forest Roads (Road Construction And Use) | Silviculture (Forestry) | 120.0 |
| Municipal Point Source Discharges | Municipal Dishcarges/Sewage | 15.0 |
Arizona Causes of Impairment for Reporting Year 2004
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. | |||||||||||||||
| Cause of Impairment Group | Size of Assessed Waters with Listed Causes of Impairment | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rivers and Streams (Miles) |
Lakes, Reservoirs, and Ponds (Acres) |
||||||||||||||
| Ammonia | 6.2 | 1,456.0 | |||||||||||||
| Chlorine | 6.2 | ||||||||||||||
| Mercury | 34.6 | 5,332.6 | |||||||||||||
| Metals (other than Mercury) | 402.8 | ||||||||||||||
| Nuisance Native Species | 15.0 | ||||||||||||||
| Nutrients | 32.1 | 395.0 | |||||||||||||
| Organic Enrichment/Oxygen Depletion | 50.2 | 1,180.0 | |||||||||||||
| Pathogens | 99.1 | 13.0 | |||||||||||||
| Pesticides | 98.9 | 285.0 | |||||||||||||
| pH/Acidity/Caustic Conditions | 44.0 | 2,133.0 | |||||||||||||
| Sediment | 109.6 | ||||||||||||||
| Toxic Inorganics | 33.6 | ||||||||||||||
| Turbidity | 106.5 | ||||||||||||||
Arizona Probable Sources Contributing to Impairments
for Reporting Year 2004
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 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rivers and Streams (Miles) |
Lakes, Reservoirs, and Ponds (Acres) |
||||||||||||||
| Agriculture | 394.7 | 515.0 | |||||||||||||
| Atmospheric Deposition | 20.2 | 3,918.6 | |||||||||||||
| Construction | 185.0 | ||||||||||||||
| Habitat Alterations (Not Directly Related To Hydromodification) | 39.1 | ||||||||||||||
| Hydromodification | 151.0 | 510.0 | |||||||||||||
| Industrial | 49.1 | ||||||||||||||
| Legacy/Historical Pollutants | 35.7 | 185.0 | |||||||||||||
| Municipal Dishcarges/Sewage | 79.3 | 520.0 | |||||||||||||
| Natural/Wildlife | 622.1 | 4,671.0 | |||||||||||||
| Other | 161.8 | ||||||||||||||
| Recreation And Tourism (Non-Boating) | 99.1 | 440.0 | |||||||||||||
| Resource Extraction | 233.5 | 3,592.6 | |||||||||||||
| Silviculture (Forestry) | 37.1 | 120.0 | |||||||||||||
| Spills/Dumping | 21.7 | ||||||||||||||
| Unknown | 252.5 | 3,796.0 | |||||||||||||
| Urban-Related Runoff/Stormwater | 6.2 | 297.0 | |||||||||||||
Arizona TMDL Alternatives by Cause of Impairment 2004
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) |
||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dissolved Oxygen |  1 |
19 | ||||||||||||
| Escherichia Coli (E. Coli) | 1 |
6 | ||||||||||||
Total: 2 TMDL Alternatives
Arizona Previously Impaired Waters Now Attaining All Uses
No previously impaired waters reported as attaining all uses.
Arizona Causes of Impairment for 303(d) Listed Waters
Description of this table| NOTE: 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 |
|---|---|
| Pesticides | 37 |
| Metals (other than Mercury) | 35 |
| Mercury | 13 |
| Organic Enrichment/Oxygen Depletion | 10 |
| pH/Acidity/Caustic Conditions | 8 |
| Pathogens | 7 |
| Nutrients | 6 |
| Ammonia | 4 |
| Turbidity | 4 |
| Sediment | 3 |
| Toxic Inorganics | 2 |
| Chlorine | 1 |
| Nuisance Native Species | 1 |
Total: 131 Causes of Impairment
Arizona Cumulative TMDLs by Pollutant
This chart includes TMDLs since October 1, 1995.
Description of this table| NOTE: 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 |
|---|---|---|
| Nitrogen |  11 |
12 |
| Copper | 10 |
10 |
| Phosphorus | 7 |
8 |
| Turbidity | 7 |
7 |
| Zinc | 7 |
7 |
| Cadmium | 6 |
6 |
| pH | 6 |
6 |
| Dissolved Oxygen | 3 |
3 |
| Escherichia Coli (E. Coli) | 3 |
3 |
| Mercury | 2 |
2 |
| Ammonia | 1 |
1 |
| Arsenic | 1 |
1 |
| Beryllium | 1 |
2 |
| Chlorophyll-A | 1 |
1 |
| Lead | 1 |
1 |
| Total Coliform | 1 |
3 |
| pH, High | 1 |
1 |
Total: 69 TMDLs; 74 Causes of Impairment Addressed
Arizona 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 |
|---|---|---|
| 2000 | 26 |
30 |
| 2001 | 1 |
1 |
| 2002 | 5 |
5 |
| 2003 | 20 |
21 |
| 2004 | 5 |
5 |
| 2005 | 10 |
10 |
| 2007 | 2 |
2 |
Total: 69 TMDLs; 74 Causes of Impairment Addressed