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- 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
- TMDLs for Indian Country Waters by Fiscal Year
Data are also available for these cycles:
2004
2006
Waterbody Changes from Prior Cycle
For More Information:
Oregon Assessment Report
State Water Quality Program
Oregon Impaired Waters and TMDL Information
Assessed Waters of Oregon by Watershed
Search for a waterbody within Oregon
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Oregon 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.
Oregon 2002 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 |
|---|---|
| Temperature |  930 |
| Pathogens | 144 |
| Organic Enrichment/Oxygen Depletion | 98 |
| Metals (other than Mercury) | 87 |
| Sediment | 65 |
| pH/Acidity/Caustic Conditions | 42 |
| Algal Growth | 32 |
| Pesticides | 31 |
| Cause Unknown - Impaired Biota | 24 |
| Mercury | 22 |
| Polychlorinated Biphenyls (PCBs) | 8 |
| Toxic Organics | 6 |
| Turbidity | 4 |
| Other Cause | 4 |
| Nutrients | 3 |
| Ammonia | 3 |
| Chlorine | 2 |
Total: 1,505 Causes of Impairment
Oregon 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 |
|---|---|---|
| Temperature |  817 |
817 |
| Escherichia Coli (E. Coli) | 117 |
117 |
| Bacteria | 81 |
81 |
| Sedimentation | 39 |
39 |
| Dissolved Oxygen | 35 |
35 |
| pH | 19 |
19 |
| Phosphorus, Total | 13 |
17 |
| Chlorophyll-A | 11 |
11 |
| Inorganic Phosphorus | 10 |
10 |
| Mercury | 10 |
10 |
| Total Dissolved Gas | 10 |
10 |
| Biochemical Oxygen Demand (BOD) | 8 |
16 |
| Nitrogen, Total | 7 |
14 |
| Sediment | 7 |
7 |
| Fecal Coliform | 6 |
6 |
| Aquatic Weeds or Algae | 5 |
5 |
| Inorganic Nitrogen | 5 |
5 |
| DDT | 4 |
4 |
| Dieldrin | 4 |
4 |
| Phosphorus | 4 |
4 |
| Turbidity | 4 |
4 |
| Nitrate | 3 |
3 |
| Nutrients | 3 |
3 |
| Pesticides | 3 |
6 |
| Ammonia | 2 |
2 |
| DDD | 2 |
2 |
| DDE | 2 |
2 |
| Iron | 2 |
2 |
| Nuisance Exotic Species | 2 |
2 |
| Algal Growth/Chlorophyll A | 1 |
1 |
| Ammonia Nitrogen | 1 |
1 |
| Dioxins | 1 |
1 |
| Lead | 1 |
1 |
| Polychlorinated Biphenyls (PCBs) | 1 |
1 |
| Sediment Oxygen Demand | 1 |
1 |
Total: 1,241 TMDLs; 1,263 Causes of Impairment Addressed
Oregon 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 |
|---|---|---|
| 1996 | 5 |
5 |
| 1999 | 11 |
11 |
| 2000 | 73 |
73 |
| 2001 | 190 |
190 |
| 2002 | 67 |
67 |
| 2003 | 49 |
49 |
| 2004 | 41 |
41 |
| 2005 | 21 |
21 |
| 2006 | 207 |
207 |
| 2007 | 192 |
192 |
| 2008 | 32 |
32 |
| 2009 | 147 |
150 |
| 2010 | 37 |
37 |
| 2011 | 156 |
156 |
| 2012 | 13 |
32 |
Total: 1,241 TMDLs; 1,263 Causes of Impairment Addressed
Oregon Cumulative Number of TMDLs for Indian Country Waters
EPA Fiscal Year starts October 1 and ends September 30.
Description of this table
| NOTE:Click on the underlined "Number of TMDLs" value for a detailed list of the TMDLs for the fiscal year. | ||
| Fiscal Year | Number of TMDLs | Number of Causes of Impairment Addressed |
|---|---|---|
| 2005 | 9 |
10 |
Total: 9 TMDLs; 0 Causes of Impairment