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- Maine Assessment 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
2008
2010
Waterbody Changes from Prior Cycle
For More Information:
Maine Assessment Report
State Water Quality Program
Maine Water Quality Assessment Report
Assessed Waters of Maine by Watershed
Search for a waterbody within Maine
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- Pollution Categories Summary Document
Site-specific Targeted Monitoring Summary Results
Maine (2006)
Description of this table| Size of Water | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rivers and Streams (Miles) |
Lakes, Reservoirs, and Ponds (Acres) |
||||||||||||||
| Good Waters | 29,630.7 | 853,739.0 | |||||||||||||
| Previously impaired waters now attaining all uses |
70.3 | 6,926.0 | |||||||||||||
| Threatened Waters | |||||||||||||||
| TMDL completed | |||||||||||||||
| TMDL alternative | |||||||||||||||
| Non-pollutant impairment | |||||||||||||||
| TMDL needed | |||||||||||||||
| Impaired Waters | 1,214.0 | 109,565.0 | |||||||||||||
| TMDL completed | 75.1 | ||||||||||||||
| TMDL alternative | 101.9 | 3,296.0 | |||||||||||||
| Non-pollutant impairment | 32.2 | 65,832.0 | |||||||||||||
| TMDL needed | 1,004.8 | 40,437.0 | |||||||||||||
| New TMDLs completed | 81.1 | 15,797.0 | |||||||||||||
| Remaining TMDLs needed | 923.7 | 24,640.0 | |||||||||||||
 |
|||||||||||||||
| Total Assessed Waters | 30,844.7 | 963,304.0 | |||||||||||||
| Total Waters | 31,752.0 | 987,283.0 | |||||||||||||
| Percent of Waters Assessed | 97.1 | 97.6 | |||||||||||||
Summary of Water Quality Assessments for Each Waterbody Type
for Reporting Year 2006
Site-specific Targeted Monitoring Results
Maine Rivers and Streams 2006
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
Maine Rivers and Streams 2006
* 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 |
|||||
 % Impaired |
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| Drinking Water Supply After Disinfection | 4,399.6 | 100.0 | .0 | .0 | |
| Drinking Water Supply After Treatment | 977.4 | 99.7 | .0 | .3 | |
| Fish And Other Aquatic Life | 30,638.9 | 98.0 | .0 | 2.0 | |
| Fish Consumption | 5,558.5 | 88.3 | .0 | 11.7 | |
| Fishing | 5,359.5 | 99.8 | .0 | .2 | |
| Hydroelectric Power Generation | 1,572.2 | 100.0 | .0 | .0 | |
| Industrial Process And Cooling Water Supply | 1,572.2 | 100.0 | .0 | .0 | |
| Navigation | 5,349.9 | 99.9 | .0 | .1 | |
| Primary Contact Recreation | 5,357.2 | 96.2 | .0 | 3.8 | |
| Secondary Contact Recreation | 5,357.2 | 96.2 | .0 | 3.8 | |
Site-specific Targeted Monitoring Results
Causes of Impairment
Maine Rivers and Streams 2006
Description of this table
| Cause of Impairment | Cause of Impairment Group | Miles Threatened or Impaired |
|---|---|---|
| Polychlorinated Biphenyls (PCBs) | Polychlorinated Biphenyls (PCBs) | 395.5 |
| Dioxin (Including 2,3,7,8-TCDD) | Dioxins | 382.7 |
| Dissolved Oxygen | Organic Enrichment/Oxygen Depletion | 377.0 |
| Benthic Macroinvertebrates Bioassessments | Cause Unknown - Impaired Biota | 223.5 |
| DDT | Pesticides | 214.2 |
| Escherichia Coli (E. Coli) | Pathogens | 201.4 |
| Nutrient/Eutrophication Biological Indicators | Nutrients | 137.9 |
| Habitat Assessment (Streams) | Cause Unknown - Impaired Biota | 69.5 |
| Phosphorus, Total | Nutrients | 42.1 |
| Other Flow Regime Alterations | Flow Alteration(s) | 32.2 |
| Biochemical Oxygen Demand (BOD) | Organic Enrichment/Oxygen Depletion | 32.0 |
| Ammonia, Un-ionized | Ammonia | 29.4 |
| Zinc | Metals (other than Mercury) | 26.6 |
| Copper | Metals (other than Mercury) | 26.6 |
| Lead | Metals (other than Mercury) | 26.6 |
| Selenium | Metals (other than Mercury) | 20.5 |
| Silver | Metals (other than Mercury) | 20.5 |
| Arsenic | Metals (other than Mercury) | 20.5 |
| Aluminum | Metals (other than Mercury) | 20.5 |
| Iron | Metals (other than Mercury) | 9.4 |
| Total Suspended Solids (TSS) | Turbidity | 9.2 |
| Cadmium | Metals (other than Mercury) | 6.1 |
| Chromium, Total | Metals (other than Mercury) | 6.1 |
| Nickel | Metals (other than Mercury) | 6.1 |
| Benzene | Toxic Organics | 4.5 |
| Nitrogen, Total | Nutrients | 3.5 |
| 1,2-Dichloroethane | Pesticides | 3.2 |
| 1,1-Dichloroethane | Toxic Organics | 3.2 |
| pH | pH/Acidity/Caustic Conditions | 1.0 |
| Cause Unknown | Cause Unknown | .6 |
Site-specific Targeted Monitoring Results
Probable Sources
Maine Rivers and Streams 2006
Description of this table
| Probable Source | Probable Source Group | Miles Threatened or Impaired |
|---|---|---|
| Agriculture | Agriculture | 329.6 |
| Non-Point Source | Unspecified Nonpoint Source | 98.5 |
| Municipal Point Source Discharges | Municipal Discharges/Sewage | 89.7 |
| Industrial Point Source Discharge | Industrial | 68.0 |
| Post-Development Erosion And Sedimentation | Hydromodification | 58.1 |
| Dam Or Impoundment | Hydromodification | 55.5 |
| Wet Weather Discharges (Point Source And Combination Of Stormwater, Sso Or Cso) | Municipal Discharges/Sewage | 50.9 |
| Unspecified Urban Stormwater | Urban-Related Runoff/Stormwater | 33.8 |
| Habitat Modification - Other Than Hydromodification | Habitat Alterations (Not Directly Related To Hydromodification) | 25.8 |
| Flow Alterations From Water Diversions | Hydromodification | 25.0 |
| Upstream Source | Other | 15.8 |
| Inappropriate Waste Disposal | Spills/Dumping | 13.9 |
| Rcra Hazardous Waste Sites | Industrial | 12.2 |
| Aquaculture (Permitted) | Aquaculture | 9.1 |
| Sources Outside State Juristiction Or Borders | Other | 8.2 |
| Impacts From Abandoned Mine Lands (Inactive) | Resource Extraction | 3.0 |
| Airports | Industrial | 2.5 |
| Impacts From Hydrostructure Flow Regulation/Modification | Hydromodification | 1.0 |
| Source Unknown | Unknown | .8 |
| Wet Weather Discharges (Non-Point Source) | Urban-Related Runoff/Stormwater | .6 |
| Illegal Dumps Or Other Inappropriate Waste Disposal | Spills/Dumping | .6 |
Site-specific Targeted Monitoring Results
Maine Lakes, Reservoirs, and Ponds 2006
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
Maine Lakes, Reservoirs, and Ponds 2006
* 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 |
|||||
| Drinking Water Supply After Disinfection | 391,920.0 | 100.0 | .0 | .0 | |
| Fish And Other Aquatic Life | 963,304.0 | 91.9 | .0 | 8.1 | |
| Fish Consumption | 390,844.0 | 100.0 | .0 | .0 | |
| Fishing | 391,920.0 | 100.0 | .0 | .0 | |
| Hydroelectric Power Generation | 391,920.0 | 100.0 | .0 | .0 | |
| Industrial Process And Cooling Water Supply | 391,920.0 | 100.0 | .0 | .0 | |
| Navigation | 391,920.0 | 100.0 | .0 | .0 | |
| Primary Contact Recreation | 391,920.0 | 91.9 | .0 | 8.1 | |
| Secondary Contact Recreation | 391,920.0 | 100.0 | .0 | .0 | |
Site-specific Targeted Monitoring Results
Causes of Impairment
Maine Lakes, Reservoirs, and Ponds 2006
Description of this table
| Cause of Impairment | Cause of Impairment Group | Acres Threatened or Impaired |
|---|---|---|
| Habitat Assessment (Lakes) | Cause Unknown - Impaired Biota | 65,832.0 |
| Phosphorus, Total | Nutrients | 43,285.0 |
| Secchi Disk Transparency | Turbidity | 35,204.0 |
| Dissolved Oxygen | Organic Enrichment/Oxygen Depletion | 8,081.0 |
| Turbidity | Turbidity | 7,865.0 |
| Nutrient/Eutrophication Biological Indicators | Nutrients | 448.0 |
Site-specific Targeted Monitoring Results
Probable Sources
Maine Lakes, Reservoirs, and Ponds 2006
Description of this table
| Probable Source | Probable Source Group | Acres Threatened or Impaired |
|---|---|---|
| Impacts From Hydrostructure Flow Regulation/Modification | Hydromodification | 65,832.0 |
| Rural (Residential Areas) | Other | 37,571.0 |
| Non-Irrigated Crop Production | Agriculture | 12,058.0 |
| Internal Nutrient Recycling | Natural/Wildlife | 11,490.0 |
| Livestock (Grazing Or Feeding Operations) | Agriculture | 10,929.0 |
| Natural Sources | Natural/Wildlife | 10,195.0 |
| Crop Production (Crop Land Or Dry Land) | Agriculture | 7,784.0 |
| Residential Districts | Urban-Related Runoff/Stormwater | 6,019.0 |
| Municipal Point Source Discharges | Municipal Discharges/Sewage | 4,288.0 |
| Unspecified Urban Stormwater | Urban-Related Runoff/Stormwater | 3,296.0 |
| Unspecified Unpaved Road Or Trail | Urban-Related Runoff/Stormwater | 3,296.0 |
| Industrial Land Treatment | Industrial | 1,820.0 |
| Upstream/Dowstream Source | Other | 83.0 |
| Flow Alterations From Water Diversions | Hydromodification | 30.0 |
| Landfills | Land Application/Waste Sites/Tanks | 29.0 |
Maine Causes of Impairment for Reporting Year 2006
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, 557K, About PDF) for brief, non-technical descriptions of general cause categories. | |||||||||||||||
| Cause of Impairment Group | Size of Assessed Waters with Listed Causes of Impairment | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rivers and Streams (Miles) |
Lakes, Reservoirs, and Ponds (Acres) |
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| Ammonia | 29.4 | ||||||||||||||
| Cause Unknown | .6 | ||||||||||||||
| Cause Unknown - Impaired Biota | 254.4 | 65,832.0 | |||||||||||||
| Dioxins | 382.7 | ||||||||||||||
| Flow Alteration(s) | 32.2 | ||||||||||||||
| Metals (other than Mercury) | 29.9 | ||||||||||||||
| Nutrients | 183.5 | 43,733.0 | |||||||||||||
| Organic Enrichment/Oxygen Depletion | 398.5 | 8,081.0 | |||||||||||||
| Pathogens | 201.4 | ||||||||||||||
| Pesticides | 217.4 | ||||||||||||||
| pH/Acidity/Caustic Conditions | 1.0 | ||||||||||||||
| Polychlorinated Biphenyls (PCBs) | 395.5 | ||||||||||||||
| Toxic Organics | 7.7 | ||||||||||||||
| Turbidity | 9.2 | 43,069.0 | |||||||||||||
Maine Probable Sources Contributing to Impairments
for Reporting Year 2006
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 | 329.6 | 30,478.0 | |||||||||||||
| Aquaculture | 9.1 | ||||||||||||||
| Habitat Alterations (Not Directly Related To Hydromodification) | 25.8 | ||||||||||||||
| Hydromodification | 139.6 | 65,862.0 | |||||||||||||
| Industrial | 79.5 | 1,820.0 | |||||||||||||
| Land Application/Waste Sites/Tanks | 29.0 | ||||||||||||||
| Municipal Discharges/Sewage | 96.3 | 4,288.0 | |||||||||||||
| Natural/Wildlife | 21,639.0 | ||||||||||||||
| Other | 23.9 | 37,654.0 | |||||||||||||
| Resource Extraction | 3.0 | ||||||||||||||
| Spills/Dumping | 14.5 | ||||||||||||||
| Unknown | .8 | ||||||||||||||
| Unspecified Nonpoint Source | 98.5 | ||||||||||||||
| Urban-Related Runoff/Stormwater | 34.5 | 6,019.0 | |||||||||||||
Maine TMDL Alternatives by Cause of Impairment 2006
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) |
Lakes, Reservoirs, and Ponds (Acres) |
|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dioxin (Including 2,3,7,8-TCDD) |  20 |
313 | ||||||||||||
| Benthic Macroinvertebrates Bioassessments | 7 |
35 | ||||||||||||
| Polychlorinated Biphenyls (PCBs) | 3 |
42 | ||||||||||||
| Phosphorus, Total | 2 |
3,296 | ||||||||||||
| Secchi Disk Transparency | 2 |
3,296 | ||||||||||||
| Ammonia, Un-ionized | 1 |
1 | ||||||||||||
| Benzene | 1 |
5 | ||||||||||||
| Dissolved Oxygen | 1 |
6 | ||||||||||||
| Nitrogen, Total | 1 |
4 | ||||||||||||
Total: 38 TMDL Alternatives
Maine Previously 303(d)-Listed Waters Now Attaining All Applicable Water Quality Standards
Description of this table| NOTE: 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 |
|---|---|---|
| 2008 | 1 |
1 |
| 2011 | 6 |
7 |
Maine 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 |
|---|---|
| Cause Unknown - Impaired Biota | 64 |
| Pathogens | 62 |
| Organic Enrichment/Oxygen Depletion | 53 |
| Nutrients | 32 |
| Turbidity | 28 |
| Polychlorinated Biphenyls (PCBs) | 25 |
| Pesticides | 6 |
| Dioxins | 5 |
| Metals (other than Mercury) | 2 |
| Toxic Organics | 1 |
| pH/Acidity/Caustic Conditions | 1 |
| Cause Unknown | 1 |
Total: 280 Causes of Impairment
Maine 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 |
|---|---|---|
| Fecal Coliform |  143 |
143 |
| Escherichia Coli (E. Coli) | 62 |
62 |
| Phosphorus, Total | 47 |
56 |
| Pollutants in Urban Stormwater | 38 |
70 |
| Lead | 6 |
6 |
| Zinc | 6 |
6 |
| Biochemical Oxygen Demand (BOD) | 5 |
5 |
| NH3 | 4 |
4 |
| Copper | 3 |
3 |
| Nitrogen, Total | 3 |
5 |
| Sediment | 3 |
5 |
| Total Suspended Solids (TSS) | 3 |
5 |
| Cadmium | 2 |
2 |
| Carbonaceous Bod | 2 |
6 |
| Iron | 2 |
2 |
| Orthophosphorus | 2 |
6 |
| Aluminum | 1 |
1 |
| Arsenic | 1 |
1 |
| Chromium, Total | 1 |
1 |
| Nickel | 1 |
1 |
| Selenium | 1 |
1 |
| Silver | 1 |
1 |
Total: 337 TMDLs; 392 Causes of Impairment Addressed
Maine 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 |
|---|---|---|
| 1999 | 2 |
2 |
| 2000 | 11 |
11 |
| 2001 | 12 |
12 |
| 2002 | 2 |
2 |
| 2003 | 12 |
12 |
| 2004 | 7 |
7 |
| 2005 | 19 |
27 |
| 2006 | 6 |
8 |
| 2007 | 11 |
11 |
| 2008 | 5 |
5 |
| 2009 | 205 |
205 |
| 2010 | 10 |
23 |
| 2012 | 35 |
67 |
Total: 337 TMDLs; 392 Causes of Impairment Addressed