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- New Hampshire 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:
New Hampshire Assessment Report
State Water Quality Program
New Hampshire Water Quality Assessment Report
Assessed Waters of New Hampshire by Watershed
Search for a waterbody within New Hampshire
NOTE: In New Hampshire, all surface waters are listed as impaired for fish/shellfish consumption due to a statewide fish consumption advisory that is in effect because of elevated mercury levels in fish tissue. Excluding the statewide mercury fish/shellfish consumption advisory, the number of impaired waters is significantly less. To see assessment summaries that exclude the statewide mercury fish consumption advisory, see New Hampshire's Water Quality Assessment website.
NOTE: In New Hampshire, all surface waters are listed as impaired for fish/shellfish consumption due to a statewide fish consumption advisory that is in effect because of elevated mercury levels in fish tissue. Excluding the statewide mercury fish/shellfish consumption advisory, the number of impaired waters is significantly less. To see assessment summaries that exclude the statewide mercury fish consumption advisory, see New Hampshire's Water Quality Assessment website.
Features
- About This Database (Integrated Report)
- Assessing Water Quality (Questions and Answers)
- Integrated Reporting Guidance
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- Exchange Network
- Assessment Database
- Statewide Statistical Surveys
- How's My Waterway Local Search tool
- Pollution Categories Summary Document
Site-specific Targeted Monitoring Summary Results
New Hampshire (2006)
Description of this table| Size of Water | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rivers and Streams (Miles) |
Lakes, Reservoirs, and Ponds (Acres) |
Bays and Estuaries (Square Miles) |
Ocean and Near Coastal (Square Miles) |
||||||||||||
| Good Waters | |||||||||||||||
| Previously impaired waters now attaining all uses |
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| Threatened Waters | |||||||||||||||
| TMDL completed | |||||||||||||||
| TMDL alternative | |||||||||||||||
| Non-pollutant impairment | |||||||||||||||
| TMDL needed | |||||||||||||||
| Impaired Waters | 9,627.7 | 185,877.6 | 17.9 | 70.2 | |||||||||||
| TMDL completed | |||||||||||||||
| TMDL alternative | |||||||||||||||
| Non-pollutant impairment | |||||||||||||||
| TMDL needed | 9,627.7 | 185,877.6 | 17.9 | 70.2 | |||||||||||
| New TMDLs completed | 7,718.2 | 154,144.9 | .0 | .0 | |||||||||||
| Remaining TMDLs needed | 1,909.5 | 31,732.7 | 17.9 | 70.2 | |||||||||||
 |
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| Total Assessed Waters | 9,627.7 | 185,877.6 | 17.9 | 70.2 | |||||||||||
| Total Waters | 9,658.5 | 186,010.8 | 17.7 | 70.1 | |||||||||||
| Percent of Waters Assessed | 99.7 | 99.9 | 101.1 | 100.1 | |||||||||||
For the 2006 Integrated Report Cycle, the total assessed waters size is greater than the total waters size for the EPA Waterbody Type Bays and Estuaries in New Hampshire. This discrepancy was identified after the release of the data, and is likely due to the improvements in mapping state waters.
For the 2006 Integrated Report Cycle, the total assessed waters size is greater than the total waters size for the EPA Waterbody Type Ocean and Near Coastal in New Hampshire. This discrepancy was identified after the release of the data, and is likely due to the improvements in mapping state waters
Summary of Water Quality Assessments for Each Waterbody Type
for Reporting Year 2006
Site-specific Targeted Monitoring Results
New Hampshire Rivers and Streams 2006
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
New Hampshire 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 |
|||||
| Aquatic Life | 2,192.9 | 15.4 | .4 | 84.2 | |
| Drinking Water Supply | 9,627.7 | 100.0 | .0 | .0 | |
| Fish Consumption | 9,627.7 | .0 | .0 | 100.0 | |
| Primary Contact Recreation | 1,501.0 | 54.2 | 1.1 | 44.6 | |
| Secondary Contact Recreation | 1,622.7 | 95.0 | .0 | 5.0 | |
Site-specific Targeted Monitoring Results
Causes of Impairment
New Hampshire Rivers and Streams 2006
Description of this table
| Cause of Impairment | Cause of Impairment Group | Miles Threatened or Impaired |
|---|---|---|
| Mercury | Mercury | 9,627.7 |
| pH | pH/Acidity/Caustic Conditions | 1,571.0 |
| Escherichia Coli (E. Coli) | Pathogens | 657.3 |
| Dissolved Oxygen | Organic Enrichment/Oxygen Depletion | 283.4 |
| Aluminum | Metals (other than Mercury) | 209.2 |
| Benthic Macroinvertebrates Bioassessments | Cause Unknown - Impaired Biota | 199.2 |
| Polychlorinated Biphenyls (PCBs) | Polychlorinated Biphenyls (PCBs) | 176.1 |
| Dissolved Oxygen Saturation | Organic Enrichment/Oxygen Depletion | 162.3 |
| Lead | Metals (other than Mercury) | 120.2 |
| Habitat Assessment (Streams) | Cause Unknown - Impaired Biota | 81.1 |
| Iron | Metals (other than Mercury) | 47.7 |
| Chloride | Salinity/Total Dissolved Solids/Chlorides/Sulfates | 39.7 |
| Non-Native Aquatic Plants | Nuisance Exotic Species | 34.9 |
| Copper | Metals (other than Mercury) | 29.5 |
| Chlorophyll-A | Algal Growth | 23.6 |
| Dioxin (Including 2,3,7,8-TCDD) | Dioxins | 18.2 |
| Other Flow Regime Alterations | Flow Alteration(s) | 16.3 |
| Phosphorus, Total | Nutrients | 12.2 |
| Zinc | Metals (other than Mercury) | 11.4 |
| Foam/Flocs/Scum/Oil Slicks | Other Cause | 5.4 |
| Creosote | Toxic Organics | 3.5 |
| Taste and Odor | Taste, Color and Odor | 3.1 |
| Manganese | Metals (other than Mercury) | 3.0 |
| Arsenic | Metals (other than Mercury) | 1.5 |
| Cadmium | Metals (other than Mercury) | 1.0 |
| DDD | Pesticides | .5 |
| Chromium, Total | Metals (other than Mercury) | .5 |
| Benzo[a]pyrene (PAHs) | Toxic Organics | .2 |
Site-specific Targeted Monitoring Results
Probable Sources
New Hampshire Rivers and Streams 2006
Description of this table
| Probable Source | Probable Source Group | Miles Threatened or Impaired |
|---|---|---|
| Atmospheric Deposition - Toxics | Atmospheric Deposition | 9,627.7 |
| Source Unknown | Unknown | 2,040.2 |
| Municipal Point Source Discharges | Municipal Discharges/Sewage | 51.3 |
| Combined Sewer Overflows | Municipal Discharges/Sewage | 49.1 |
| Municipal (Urbanized High Density Area) | Urban-Related Runoff/Stormwater | 38.5 |
| Illicit Connections/Hook-Ups To Storm Sewers | Municipal Discharges/Sewage | 37.4 |
| Industrial Point Source Discharge | Industrial | 32.8 |
| Landfills | Land Application/Waste Sites/Tanks | 26.9 |
| Highway/Road/Bridge Runoff (Non-Construction Related) | Urban-Related Runoff/Stormwater | 23.8 |
| Commerical Districts (Shopping/Office Complexes) | Urban-Related Runoff/Stormwater | 23.4 |
| Unspecified Urban Stormwater | Urban-Related Runoff/Stormwater | 18.1 |
| Contaminated Groundwater | Groundwater Loadings/Withdrawals | 11.6 |
| Streambank Modifications/Destablization | Hydromodification | 9.4 |
| Inappropriate Waste Disposal | Spills/Dumping | 8.0 |
| Livestock (Grazing Or Feeding Operations) | Agriculture | 7.0 |
| Impacts From Hydrostructure Flow Regulation/Modification | Hydromodification | 6.9 |
| Acid Mine Drainage | Resource Extraction | 5.3 |
| Industrial/Commercial Site Stormwater Discharge (Permittted) | Urban-Related Runoff/Stormwater | 4.1 |
| Airports | Industrial | 4.1 |
| Rcra Hazardous Waste Sites | Industrial | 3.5 |
| Unpermitted Discharge (Industrial/Commercial Wastes) | Spills/Dumping | 2.7 |
| Unpermitted Discharge (Domestic Wastes) | Municipal Discharges/Sewage | 2.4 |
| Wet Weather Discharges (Point Source And Combination Of Stormwater, Sso Or Cso) | Municipal Discharges/Sewage | 2.0 |
| Impervious Surface/Parking Lot Runoff | Urban-Related Runoff/Stormwater | 1.3 |
| Habitat Modification - Other Than Hydromodification | Habitat Alterations (Not Directly Related To Hydromodification) | 1.3 |
| Animal Feeding Operations (Nps) | Agriculture | .3 |
| Petroleum/Natural Gas Activities | Resource Extraction | .2 |
| Pollutants From Public Bathing Areas | Recreation And Tourism (Non-Boating) | .0 |
Site-specific Targeted Monitoring Results
New Hampshire Lakes, Reservoirs, and Ponds 2006
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
New Hampshire 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 |
|||||
| Aquatic Life | 110,746.4 | 8.1 | .0 | 91.9 | |
| Drinking Water Supply | 185,877.6 | 100.0 | .0 | .0 | |
| Fish Consumption | 185,877.6 | .0 | .0 | 100.0 | |
| Primary Contact Recreation | 130,888.9 | 92.0 | .0 | 8.0 | |
| Secondary Contact Recreation | 129,686.5 | 99.5 | .0 | .5 | |
Site-specific Targeted Monitoring Results
Causes of Impairment
New Hampshire Lakes, Reservoirs, and Ponds 2006
Description of this table
| Cause of Impairment | Cause of Impairment Group | Acres Threatened or Impaired |
|---|---|---|
| Mercury | Mercury | 185,877.6 |
| pH | pH/Acidity/Caustic Conditions | 93,052.4 |
| Non-Native Aquatic Plants | Nuisance Exotic Species | 68,934.1 |
| Dissolved Oxygen Saturation | Organic Enrichment/Oxygen Depletion | 16,182.7 |
| Polychlorinated Biphenyls (PCBs) | Polychlorinated Biphenyls (PCBs) | 14,717.9 |
| Dissolved Oxygen | Organic Enrichment/Oxygen Depletion | 8,578.3 |
| Cyanobacteria Hepatotoxic Microcystins | Biotoxins | 5,820.6 |
| Escherichia Coli (E. Coli) | Pathogens | 3,667.9 |
| Chlorophyll-A | Algal Growth | 3,015.0 |
| Aluminum | Metals (other than Mercury) | 653.2 |
| Dioxin (Including 2,3,7,8-TCDD) | Dioxins | 384.1 |
| Chloride | Salinity/Total Dissolved Solids/Chlorides/Sulfates | 109.2 |
| Phosphorus, Total | Nutrients | 20.0 |
| Sedimentation/Siltation | Sediment | 19.9 |
| Dieldrin | Pesticides | 10.0 |
| Benzo[a]anthracene | Toxic Organics | 10.0 |
| Lindane | Pesticides | 10.0 |
| Indeno[1,2,3-Cd]Pyrene | Pesticides | 10.0 |
| Endrin | Pesticides | 10.0 |
| 2-Methylnaphthalene | Pesticides | 10.0 |
| Chrysene | Toxic Organics | 10.0 |
| Pyrene | Toxic Organics | 10.0 |
| Benzo[b]fluoranthene | Toxic Organics | 10.0 |
| Heptachlor | Pesticides | 10.0 |
| Benzo[k]fluoranthene | Toxic Organics | 10.0 |
| DDD | Pesticides | 10.0 |
| Benzo[a]pyrene (PAHs) | Toxic Organics | 10.0 |
| DDE | Pesticides | 10.0 |
| Acenaphthene | Toxic Organics | 10.0 |
| Excess Algal Growth | Algal Growth | 1.3 |
Site-specific Targeted Monitoring Results
Probable Sources
New Hampshire Lakes, Reservoirs, and Ponds 2006
Description of this table
| Probable Source | Probable Source Group | Acres Threatened or Impaired |
|---|---|---|
| Atmospheric Deposition - Toxics | Atmospheric Deposition | 185,877.6 |
| Source Unknown | Unknown | 93,848.2 |
| Atmospheric Deposition - Acidity | Atmospheric Deposition | 89,791.0 |
| Municipal Point Source Discharges | Municipal Discharges/Sewage | 568.9 |
| Combined Sewer Overflows | Municipal Discharges/Sewage | 562.0 |
| Municipal (Urbanized High Density Area) | Urban-Related Runoff/Stormwater | 434.6 |
| Industrial Point Source Discharge | Industrial | 415.5 |
| Illicit Connections/Hook-Ups To Storm Sewers | Municipal Discharges/Sewage | 359.1 |
| Waterfowl | Natural/Wildlife | 228.6 |
| Unpermitted Discharge (Domestic Wastes) | Municipal Discharges/Sewage | 223.3 |
| On-Site Treatment Systems (Septic Systems And Similar Decencentralized Systems) | Municipal Discharges/Sewage | 222.0 |
| Package Plant Or Other Permitted Small Flows Discharges | Municipal Discharges/Sewage | 142.2 |
| Highway/Road/Bridge Runoff (Non-Construction Related) | Urban-Related Runoff/Stormwater | 109.2 |
| Commerical Districts (Shopping/Office Complexes) | Urban-Related Runoff/Stormwater | 109.2 |
| Residential Districts | Urban-Related Runoff/Stormwater | 62.2 |
| Flow Alterations From Water Diversions | Hydromodification | 42.4 |
| Pollutants From Public Bathing Areas | Recreation And Tourism (Non-Boating) | 20.1 |
| Discharges From Municipal Separate Storm Sewer Systems (Ms4) | Urban-Related Runoff/Stormwater | 19.9 |
| Animal Feeding Operations (Nps) | Agriculture | 14.8 |
| Wet Weather Discharges (Point Source And Combination Of Stormwater, Sso Or Cso) | Municipal Discharges/Sewage | 4.6 |
| Yard Maintenance | Urban-Related Runoff/Stormwater | .6 |
Site-specific Targeted Monitoring Results
New Hampshire Bays and Estuaries 2006
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
New Hampshire Bays and Estuaries 2006
* Waters assessed for more than one designated use are included in multiple designated use groups below.
Description of this table| Designated Use | Square Miles Assessed | Percent Good | Percent Threatened | Percent Impaired | % Good |
|---|---|---|---|---|---|
| % Threatened |
|||||
| % Impaired |
|||||
| Aquatic Life | 10.3 | 32.2 | .6 | 67.2 | |
| Drinking Water Supply | 17.9 | 100.0 | .0 | .0 | |
| Fish Consumption | 17.9 | .0 | .0 | 100.0 | |
| Primary Contact Recreation | 14.7 | 62.2 | .0 | 37.8 | |
| Secondary Contact Recreation | 14.1 | 91.3 | .0 | 8.7 | |
| Shellfish Consumption | 17.9 | .0 | .0 | 100.0 | |
Site-specific Targeted Monitoring Results
Causes of Impairment
New Hampshire Bays and Estuaries 2006
Description of this table
| Cause of Impairment | Cause of Impairment Group | Square Miles Threatened or Impaired |
|---|---|---|
| Polychlorinated Biphenyls (PCBs) | Polychlorinated Biphenyls (PCBs) | 17.9 |
| Dioxin (Including 2,3,7,8-TCDD) | Dioxins | 17.9 |
| Mercury | Mercury | 17.9 |
| Fecal Coliform | Pathogens | 9.3 |
| Dissolved Oxygen | Organic Enrichment/Oxygen Depletion | 6.7 |
| Enterococcus Bacteria | Pathogens | 5.5 |
| Chlorophyll-A | Algal Growth | .9 |
| Dissolved Oxygen Saturation | Organic Enrichment/Oxygen Depletion | .9 |
| pH | pH/Acidity/Caustic Conditions | .4 |
| 2-Methylnaphthalene | Pesticides | .4 |
| Chrysene | Toxic Organics | .4 |
| Pyrene | Toxic Organics | .4 |
| Naphthalene | Pesticides | .4 |
| Dibenz[a,h]anthracene | Toxic Organics | .4 |
| Benzo[a]pyrene (PAHs) | Toxic Organics | .4 |
| DDT | Pesticides | .4 |
| DDD | Pesticides | .4 |
| DDE | Pesticides | .4 |
| Anthracene | Toxic Organics | .4 |
| Benzo[a]anthracene | Toxic Organics | .4 |
| Fluorene | Toxic Organics | .4 |
| Fluoranthene | Toxic Organics | .4 |
| Dieldrin | Pesticides | .2 |
| Acenaphthylene | Toxic Organics | .2 |
| Benzo[g,h,i]perylene | Toxic Organics | .2 |
| Acenaphthene | Toxic Organics | .2 |
| Phenanthrene | Toxic Organics | .2 |
| Indeno[1,2,3-Cd]Pyrene | Pesticides | .2 |
| Biphenyl | Toxic Organics | .2 |
Site-specific Targeted Monitoring Results
Probable Sources
New Hampshire Bays and Estuaries 2006
Description of this table
| Probable Source | Probable Source Group | Square Miles Threatened or Impaired |
|---|---|---|
| Atmospheric Deposition - Toxics | Atmospheric Deposition | 17.9 |
| Source Unknown | Unknown | 17.9 |
| Wet Weather Discharges (Point Source And Combination Of Stormwater, Sso Or Cso) | Municipal Discharges/Sewage | 2.5 |
| Combined Sewer Overflows | Municipal Discharges/Sewage | 1.7 |
| Unpermitted Discharge (Domestic Wastes) | Municipal Discharges/Sewage | .8 |
| Animal Feeding Operations (Nps) | Agriculture | .5 |
| Sanitary Sewer Overflows (Collection System Failures) | Municipal Discharges/Sewage | .4 |
| Illicit Connections/Hook-Ups To Storm Sewers | Municipal Discharges/Sewage | .4 |
Site-specific Targeted Monitoring Results
New Hampshire Ocean and Near Coastal 2006
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
New Hampshire Ocean and Near Coastal 2006
* Waters assessed for more than one designated use are included in multiple designated use groups below.
Description of this table| Designated Use | Square Miles Assessed | Percent Good | Percent Threatened | Percent Impaired | % Good |
|---|---|---|---|---|---|
| % Threatened |
|||||
| % Impaired |
|||||
| Aquatic Life | .3 | 100.0 | .0 | .0 | |
| Drinking Water Supply | 70.2 | 100.0 | .0 | .0 | |
| Fish Consumption | 70.2 | .0 | .0 | 100.0 | |
| Primary Contact Recreation | 4.3 | 13.0 | .0 | 87.0 | |
| Secondary Contact Recreation | .8 | 74.9 | .0 | 25.1 | |
| Shellfish Consumption | 70.2 | .0 | .0 | 100.0 | |
Site-specific Targeted Monitoring Results
Causes of Impairment
New Hampshire Ocean and Near Coastal 2006
Description of this table
| Cause of Impairment | Cause of Impairment Group | Square Miles Threatened or Impaired |
|---|---|---|
| Polychlorinated Biphenyls (PCBs) | Polychlorinated Biphenyls (PCBs) | 70.2 |
| Dioxin (Including 2,3,7,8-TCDD) | Dioxins | 70.2 |
| Mercury | Mercury | 70.2 |
| Enterococcus Bacteria | Pathogens | 3.7 |
| Fecal Coliform | Pathogens | 1.9 |
Site-specific Targeted Monitoring Results
Probable Sources
New Hampshire Ocean and Near Coastal 2006
Description of this table
| Probable Source | Probable Source Group | Square Miles Threatened or Impaired |
|---|---|---|
| Atmospheric Deposition - Toxics | Atmospheric Deposition | 70.2 |
| Source Unknown | Unknown | 70.2 |
| Forced Drainage Pumping | Hydromodification | 1.8 |
| Wet Weather Discharges (Point Source And Combination Of Stormwater, Sso Or Cso) | Municipal Discharges/Sewage | 1.5 |
| Waterfowl | Natural/Wildlife | .1 |
| Unpermitted Discharge (Domestic Wastes) | Municipal Discharges/Sewage | .1 |
| Sewage Discharges In Unsewered Areas | Municipal Discharges/Sewage | .0 |
New Hampshire Causes of Impairment for Reporting Year 2006
Description of this table
New Hampshire 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) |
Bays and Estuaries (Square Miles) |
Ocean and Near Coastal (Square Miles) |
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| Agriculture | 7.3 | 14.8 | .5 | ||||||||||||
| Atmospheric Deposition | 9,627.7 | 185,877.6 | 17.9 | 70.2 | |||||||||||
| Groundwater Loadings/Withdrawals | 11.6 | ||||||||||||||
| Habitat Alterations (Not Directly Related To Hydromodification) | 1.3 | ||||||||||||||
| Hydromodification | 16.3 | 42.4 | 1.8 | ||||||||||||
| Industrial | 40.3 | 415.5 | |||||||||||||
| Land Application/Waste Sites/Tanks | 26.9 | ||||||||||||||
| Municipal Discharges/Sewage | 139.6 | 1,810.0 | 4.6 | 1.6 | |||||||||||
| Natural/Wildlife | 228.6 | .1 | |||||||||||||
| Recreation And Tourism (Non-Boating) | .0 | 20.1 | |||||||||||||
| Resource Extraction | 5.5 | ||||||||||||||
| Spills/Dumping | 10.8 | ||||||||||||||
| Unknown | 2,040.2 | 93,848.2 | 17.9 | 70.2 | |||||||||||
| Urban-Related Runoff/Stormwater | 42.5 | 497.4 | |||||||||||||
New Hampshire 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) |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Escherichia Coli (E. Coli) |  28 |
42 | 218 | |||||||||||
| Dioxin (Including 2,3,7,8-TCDD) | 18 |
18 | 384 | |||||||||||
| Iron | 3 |
10 | ||||||||||||
| Copper | 2 |
13 | ||||||||||||
| Dissolved Oxygen | 1 |
4 | ||||||||||||
| Zinc | 1 |
4 | ||||||||||||
| pH | 1 |
5 | ||||||||||||
Total: 54 TMDL Alternatives
New Hampshire Previously 303(d)-Listed Waters Now Attaining All Applicable Water Quality Standards
No previously 303(d)-listed waters reported as now attaining all applicable water quality standards.
New Hampshire 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 |
|---|---|
| Mercury | 5,211 |
| pH/Acidity/Caustic Conditions | 717 |
| Pathogens | 295 |
| Organic Enrichment/Oxygen Depletion | 234 |
| Metals (other than Mercury) | 128 |
| Polychlorinated Biphenyls (PCBs) | 119 |
| Dioxins | 83 |
| Algal Growth | 46 |
| Cause Unknown - Impaired Biota | 41 |
| Toxic Organics | 30 |
| Salinity/Total Dissolved Solids/Chlorides/Sulfates | 21 |
| Pesticides | 21 |
| Nutrients | 9 |
| Other Cause | 2 |
| Sediment | 2 |
| Taste, Color and Odor | 1 |
Total: 6,960 Causes of Impairment
New Hampshire 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 |
|---|---|---|
| Mercury |  5,124 |
5,124 |
| Escherichia Coli (E. Coli) | 380 |
380 |
| pH | 372 |
372 |
| Fecal Coliform | 48 |
48 |
| Enterococcus Bacteria | 39 |
39 |
| Phosphorus, Total | 29 |
69 |
| Chloride | 4 |
4 |
| pH, Low | 3 |
6 |
| Carbonaceous Bod | 2 |
2 |
| NH3-N | 2 |
2 |
| Biochemical Oxygen Demand (BOD) | 1 |
2 |
| Iron | 1 |
1 |
| NH3 | 1 |
2 |
Total: 6,006 TMDLs; 6,051 Causes of Impairment Addressed
New Hampshire 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 | 5 |
8 |
| 2001 | 3 |
3 |
| 2002 | 1 |
1 |
| 2003 | 2 |
2 |
| 2004 | 53 |
53 |
| 2005 | 20 |
20 |
| 2006 | 23 |
26 |
| 2007 | 160 |
160 |
| 2008 | 5,238 |
5,238 |
| 2009 | 4 |
4 |
| 2010 | 403 |
403 |
| 2011 | 91 |
130 |
| 2012 | 3 |
3 |
Total: 6,006 TMDLs; 6,051 Causes of Impairment Addressed