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Scientific Investigations Report 2009–5078

Assessment of Eutrophication in the Lower Yakima River Basin, Washington, 2004–07

Table 2. Reference conditions for nutrients suggested by the U.S. Environmental Protection Agency for streams in the Yakima River basin, Washington.

[Data from U.S. Environmental Protection Agency, 2000b. Values in milligrams per liter]

Parameter Number of
Total Kjeldahl nitrogen 106 0.288
Nitrite plus nitrate 71 0.072
Total nitrogen 24 0.221
Total phosphorus 127 0.03

For additional information contact:
Director, Oregon Water Science Center
U.S. Geological Survey
2130 SW 5th Avenue
Portland, Oregon 97201

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