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- Puerto Rico 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
2006
2008
Waterbody Changes from Prior Cycle
For More Information:
Puerto Rico Water Quality Assessment Report
Assessed Waters of Puerto Rico by Watershed
Search for a waterbody within Puerto Rico
NOTE: The data and information provided on this web site may differ from the information provided in the original Puerto Rico 2010 Section 305(b) Report. This is a result of differences in the way the state's assessment database tracks information and how the national data system prepares summary reports. Puerto Rico's 2010 Section 305(b) Water Quality Report is available at http://www.gobierno.pr/NR/rdonlyres/71E6B4C6-0825-4451-8A2F-983F4524F03E/0/PartI2010305_b_y303_d_RevisedSeptember2010x.pdf. The 2010 303(d) List can be found on Appendix I.
NOTE: The data and information provided on this web site may differ from the information provided in the original Puerto Rico 2010 Section 305(b) Report. This is a result of differences in the way the state's assessment database tracks information and how the national data system prepares summary reports. Puerto Rico's 2010 Section 305(b) Water Quality Report is available at http://www.gobierno.pr/NR/rdonlyres/71E6B4C6-0825-4451-8A2F-983F4524F03E/0/PartI2010305_b_y303_d_RevisedSeptember2010x.pdf. The 2010 303(d) List can be found on Appendix I.
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Site-specific Targeted Monitoring Summary Results
Puerto Rico (2010)
Description of this table| Size of Water | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rivers and Streams (Miles) |
Lakes, Reservoirs, and Ponds (Acres) |
Bays and Estuaries (Square Miles) |
Coastal Shoreline (Miles) |
||||||||||||
| Good Waters | 199.3 | 547.0 | .1 | 322.5 | |||||||||||
| Previously impaired waters now attaining all uses |
98.1 | ||||||||||||||
| Threatened Waters | |||||||||||||||
| TMDL completed | |||||||||||||||
| TMDL alternative | |||||||||||||||
| Non-pollutant impairment | |||||||||||||||
| TMDL needed | |||||||||||||||
| Impaired Waters | 4,187.2 | 8,093.0 | 4.9 | 196.8 | |||||||||||
| TMDL completed | |||||||||||||||
| TMDL alternative | |||||||||||||||
| Non-pollutant impairment | |||||||||||||||
| TMDL needed | 4,187.2 | 8,093.0 | 4.9 | 196.8 | |||||||||||
| New TMDLs completed | 156.6 | .0 | .3 | .0 | |||||||||||
| Remaining TMDLs needed | 4,030.6 | 8,093.0 | 4.7 | 196.8 | |||||||||||
 |
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| Total Assessed Waters | 4,386.5 | 8,640.0 | 5.0 | 519.2 | |||||||||||
| Total Waters | 5,394.0 | 12,146.0 | Unavailable | 550.0 | |||||||||||
| Percent of Waters Assessed | 81.3 | 71.1 | Unavailable | 94.4 | |||||||||||
Summary of Water Quality Assessments for Each Waterbody Type
for Reporting Year 2010
Site-specific Targeted Monitoring Results
Puerto Rico Rivers and Streams 2010
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
Puerto Rico Rivers and Streams 2010
* 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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| Aquatic Life | 4,229.9 | 4.7 | .0 | 95.3 | |
| Primary Contact Recreation | 3,422.1 | 8.0 | .0 | 92.0 | |
| Public Water Supply | 3,694.8 | 14.7 | .0 | 85.3 | |
| Secondary Contact Recreation | 3,598.2 | 43.9 | .0 | 56.1 | |
Site-specific Targeted Monitoring Results
Causes of Impairment
Puerto Rico Rivers and Streams 2010
Description of this table
| Cause of Impairment | Cause of Impairment Group | Miles Threatened or Impaired |
|---|---|---|
| Arsenic | Metals (other than Mercury) | 3,460.9 |
| Cyanide | Toxic Inorganics | 3,200.6 |
| Fecal Coliform | Pathogens | 3,149.3 |
| Turbidity | Turbidity | 2,667.5 |
| Surfactants | Other Cause | 1,827.6 |
| Dissolved Oxygen | Organic Enrichment/Oxygen Depletion | 1,539.7 |
| Copper | Metals (other than Mercury) | 1,496.5 |
| Lead | Metals (other than Mercury) | 1,008.2 |
| Ammonia, Total | Ammonia | 461.1 |
| Thermal Modifications | Temperature | 450.5 |
| Mercury | Mercury | 401.3 |
| Phosphorus, Total | Nutrients | 301.2 |
| Pesticides | Pesticides | 258.2 |
| pH | pH/Acidity/Caustic Conditions | 219.7 |
| Oil and Grease | Oil and Grease | 122.6 |
| Cadmium | Metals (other than Mercury) | 51.4 |
| Selenium | Metals (other than Mercury) | 40.8 |
| Other Inorganics | Toxic Inorganics | 22.0 |
| Silver | Metals (other than Mercury) | 14.6 |
Site-specific Targeted Monitoring Results
Probable Sources
Puerto Rico Rivers and Streams 2010
Description of this table
| Probable Source | Probable Source Group | Miles Threatened or Impaired |
|---|---|---|
| On-Site Treatment Systems (Septic Systems And Similar Decentralized Systems) | Municipal Discharges/Sewage | 4,172.6 |
| Animal Feeding Operations (Nps) | Agriculture | 2,882.7 |
| Urban Runoff/Storm Sewers | Urban-Related Runoff/Stormwater | 2,501.9 |
| Minor Industrial Point Sources | Industrial | 2,477.0 |
| Agriculture | Agriculture | 2,214.2 |
| Sanitary Sewer Overflows (Collection System Failures) | Municipal Discharges/Sewage | 2,039.6 |
| Landfills | Land Application/Waste Sites/Tanks | 1,841.9 |
| Major Municipal Point Sources | Municipal Discharges/Sewage | 1,222.6 |
| Minor Municipal Point Sources | Municipal Discharges/Sewage | 709.0 |
| Surface Mining | Resource Extraction | 563.8 |
| Land Development | Construction | 508.5 |
| Package Plant Or Other Permitted Small Flows Discharges | Municipal Discharges/Sewage | 324.5 |
| Major Industrial Point Sources | Industrial | 170.8 |
| Marinas And Recreational Boating | Recreational Boating And Marinas | 18.8 |
| Upstream Impoundments (E.G., Pl-566 Nrcs Structures) | Hydromodification | 11.8 |
Site-specific Targeted Monitoring Results
Puerto Rico Lakes, Reservoirs, and Ponds 2010
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
Puerto Rico Lakes, Reservoirs, and Ponds 2010
* 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 |
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| Aquatic Life | 8,640.0 | 6.3 | .0 | 93.7 | |
| Primary Contact Recreation | 8,424.0 | 71.8 | .0 | 28.2 | |
| Public Water Supply | 7,323.0 | 60.3 | .0 | 39.7 | |
| Secondary Contact Recreation | 8,424.0 | 100.0 | .0 | .0 | |
Site-specific Targeted Monitoring Results
Causes of Impairment
Puerto Rico Lakes, Reservoirs, and Ponds 2010
Description of this table
| Cause of Impairment | Cause of Impairment Group | Acres Threatened or Impaired |
|---|---|---|
| Dissolved Oxygen | Organic Enrichment/Oxygen Depletion | 7,504.0 |
| Arsenic | Metals (other than Mercury) | 3,461.0 |
| Fecal Coliform | Pathogens | 2,379.0 |
| Pesticides | Pesticides | 2,133.0 |
| Cyanide | Toxic Inorganics | 1,748.0 |
| Phosphorus, Total | Nutrients | 1,273.0 |
| Surfactants | Other Cause | 1,188.0 |
| Mercury | Mercury | 1,000.0 |
| Turbidity | Turbidity | 713.0 |
| Copper | Metals (other than Mercury) | 634.0 |
| pH | pH/Acidity/Caustic Conditions | 559.0 |
Site-specific Targeted Monitoring Results
Probable Sources
Puerto Rico Lakes, Reservoirs, and Ponds 2010
Description of this table
| Probable Source | Probable Source Group | Acres Threatened or Impaired |
|---|---|---|
| On-Site Treatment Systems (Septic Systems And Similar Decentralized Systems) | Municipal Discharges/Sewage | 7,227.0 |
| Agriculture | Agriculture | 3,680.0 |
| Animal Feeding Operations (Nps) | Agriculture | 3,585.0 |
| Minor Industrial Point Sources | Industrial | 2,187.0 |
| Urban Runoff/Storm Sewers | Urban-Related Runoff/Stormwater | 2,183.0 |
| Sanitary Sewer Overflows (Collection System Failures) | Municipal Discharges/Sewage | 1,086.0 |
| Upstream Impoundments (E.G., Pl-566 Nrcs Structures) | Hydromodification | 700.0 |
| Landfills | Land Application/Waste Sites/Tanks | 560.0 |
| Major Industrial Point Sources | Industrial | 285.0 |
| Marinas And Recreational Boating | Recreational Boating And Marinas | 216.0 |
Site-specific Targeted Monitoring Results
Puerto Rico Bays and Estuaries 2010
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
Puerto Rico Bays and Estuaries 2010
* 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 | 4.9 | 4.5 | .0 | 95.5 | |
| Primary Contact Recreation | 5.0 | 1.9 | .0 | 98.1 | |
| Secondary Contact Recreation | 5.0 | 4.4 | .0 | 95.6 | |
Site-specific Targeted Monitoring Results
Causes of Impairment
Puerto Rico Bays and Estuaries 2010
Description of this table
| Cause of Impairment | Cause of Impairment Group | Square Miles Threatened or Impaired |
|---|---|---|
| Fecal Coliform | Pathogens | 4.9 |
| Dissolved Oxygen | Organic Enrichment/Oxygen Depletion | 4.6 |
| Cyanide | Toxic Inorganics | 3.9 |
| Arsenic | Metals (other than Mercury) | 3.9 |
| Turbidity | Turbidity | 3.9 |
| Oil and Grease | Oil and Grease | 3.8 |
| Ammonia, Total | Ammonia | 3.8 |
| Surfactants | Other Cause | 3.8 |
| pH | pH/Acidity/Caustic Conditions | 3.7 |
| Phosphorus, Total | Nutrients | 3.7 |
| Copper | Metals (other than Mercury) | .1 |
| Mercury | Mercury | .1 |
| Lead | Metals (other than Mercury) | .1 |
Site-specific Targeted Monitoring Results
Probable Sources
Puerto Rico Bays and Estuaries 2010
Description of this table
| Probable Source | Probable Source Group | Square Miles Threatened or Impaired |
|---|---|---|
| On-Site Treatment Systems (Septic Systems And Similar Decentralized Systems) | Municipal Discharges/Sewage | 4.9 |
| Sanitary Sewer Overflows (Collection System Failures) | Municipal Discharges/Sewage | 4.1 |
| Urban Runoff/Storm Sewers | Urban-Related Runoff/Stormwater | 4.0 |
| Animal Feeding Operations (Nps) | Agriculture | 3.9 |
| Major Industrial Point Sources | Industrial | .7 |
| Minor Municipal Point Sources | Municipal Discharges/Sewage | .6 |
| Landfills | Land Application/Waste Sites/Tanks | .4 |
| Agriculture | Agriculture | .2 |
| Minor Industrial Point Sources | Industrial | .1 |
| Major Municipal Point Sources | Municipal Discharges/Sewage | .1 |
Site-specific Targeted Monitoring Results
Puerto Rico Coastal Shoreline 2010
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
Puerto Rico Coastal Shoreline 2010
* 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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| Aquatic Life | 496.4 | 64.3 | .0 | 35.7 | |
| Primary Contact Recreation | 510.1 | 77.2 | .0 | 22.8 | |
| Secondary Contact Recreation | 503.7 | 100.0 | .0 | .0 | |
Site-specific Targeted Monitoring Results
Causes of Impairment
Puerto Rico Coastal Shoreline 2010
Description of this table
| Cause of Impairment | Cause of Impairment Group | Miles Threatened or Impaired |
|---|---|---|
| Dissolved Oxygen | Organic Enrichment/Oxygen Depletion | 138.1 |
| Enterococcus Bacteria | Pathogens | 98.6 |
| Fecal Coliform | Pathogens | 92.8 |
| pH | pH/Acidity/Caustic Conditions | 69.5 |
| Turbidity | Turbidity | 67.0 |
| Thermal Modifications | Temperature | 20.2 |
| Copper | Metals (other than Mercury) | 7.8 |
| Ammonia, Total | Ammonia | 7.8 |
| Arsenic | Metals (other than Mercury) | 7.8 |
Site-specific Targeted Monitoring Results
Probable Sources
Puerto Rico Coastal Shoreline 2010
Description of this table
| Probable Source | Probable Source Group | Miles Threatened or Impaired |
|---|---|---|
| Urban Runoff/Storm Sewers | Urban-Related Runoff/Stormwater | 194.3 |
| On-Site Treatment Systems (Septic Systems And Similar Decentralized Systems) | Municipal Discharges/Sewage | 194.3 |
| Upstream Impoundments (E.G., Pl-566 Nrcs Structures) | Hydromodification | 99.8 |
| Major Industrial Point Sources | Industrial | 91.7 |
| Major Municipal Point Sources | Municipal Discharges/Sewage | 47.0 |
| Agriculture | Agriculture | 41.0 |
| Marinas And Recreational Boating | Recreational Boating And Marinas | 35.1 |
| Land Development | Construction | 20.3 |
| Sanitary Sewer Overflows (Collection System Failures) | Municipal Discharges/Sewage | 13.7 |
| Minor Municipal Point Sources | Municipal Discharges/Sewage | 7.8 |
| Landfills | Land Application/Waste Sites/Tanks | 7.0 |
Puerto Rico Causes of Impairment for Reporting Year 2010
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) |
Bays and Estuaries (Square Miles) |
Coastal Shoreline (Miles) |
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| Ammonia | 461.1 | 3.8 | 7.8 | ||||||||||||
| Mercury | 401.3 | 1,000.0 | .1 | ||||||||||||
| Metals (other than Mercury) | 3,460.9 | 3,461.0 | 3.9 | 7.8 | |||||||||||
| Nutrients | 301.2 | 1,273.0 | 3.7 | ||||||||||||
| Oil and Grease | 122.6 | 3.8 | |||||||||||||
| Organic Enrichment/Oxygen Depletion | 1,539.7 | 7,504.0 | 4.6 | 138.1 | |||||||||||
| Other Cause | 1,827.6 | 1,188.0 | 3.8 | ||||||||||||
| Pathogens | 3,149.3 | 2,379.0 | 4.9 | 116.4 | |||||||||||
| Pesticides | 258.2 | 2,133.0 | |||||||||||||
| pH/Acidity/Caustic Conditions | 219.7 | 559.0 | 3.7 | 69.5 | |||||||||||
| Temperature | 450.5 | 20.2 | |||||||||||||
| Toxic Inorganics | 3,222.6 | 1,748.0 | 3.9 | ||||||||||||
| Turbidity | 2,667.5 | 713.0 | 3.9 | 67.0 | |||||||||||
Puerto Rico Probable Sources Contributing to Impairments
for Reporting Year 2010
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) |
Coastal Shoreline (Miles) |
||||||||||||
| Agriculture | 3,693.4 | 6,554.0 | 4.0 | 41.0 | |||||||||||
| Construction | 508.5 | 20.3 | |||||||||||||
| Hydromodification | 11.8 | 700.0 | 99.8 | ||||||||||||
| Industrial | 2,585.3 | 2,187.0 | .8 | 91.7 | |||||||||||
| Land Application/Waste Sites/Tanks | 1,841.9 | 560.0 | .4 | 7.0 | |||||||||||
| Municipal Discharges/Sewage | 4,172.6 | 7,227.0 | 4.9 | 194.3 | |||||||||||
| Recreational Boating And Marinas | 18.8 | 216.0 | 35.1 | ||||||||||||
| Resource Extraction | 563.8 | ||||||||||||||
| Urban-Related Runoff/Stormwater | 2,501.9 | 2,183.0 | 4.0 | 194.3 | |||||||||||
Puerto Rico TMDL Alternatives by Cause of Impairment 2010
No TMDL Alternatives reported.
Puerto Rico 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 |
|---|---|---|
| 2004 | 1 |
1 |
| 2010 | 1 |
1 |
Puerto Rico 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 |
|---|---|
| Metals (other than Mercury) | 148 |
| Pathogens | 122 |
| Organic Enrichment/Oxygen Depletion | 77 |
| Toxic Inorganics | 76 |
| Turbidity | 62 |
| Other Cause | 44 |
| pH/Acidity/Caustic Conditions | 13 |
| Temperature | 12 |
| Pesticides | 10 |
| Ammonia | 9 |
| Mercury | 9 |
| Nutrients | 8 |
| Oil and Grease | 3 |
Total: 593 Causes of Impairment
Puerto Rico 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 |  313 |
313 |
| Biochemical Oxygen Demand (BOD) | 4 |
4 |
| Copper | 2 |
2 |
| Total Ammonia | 2 |
2 |
Total: 321 TMDLs; 321 Causes of Impairment Addressed
Puerto Rico 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 |
|---|---|---|
| 2002 | 14 |
14 |
| 2003 | 4 |
4 |
| 2007 | 27 |
27 |
| 2008 | 8 |
8 |
| 2010 | 52 |
52 |
| 2011 | 118 |
118 |
| 2012 | 98 |
98 |
Total: 321 TMDLs; 321 Causes of Impairment Addressed