USGS Scientific Investigations Report 2009–5078Assessment of Eutrophication in the Lower Yakima River Basin, Washington, 2004

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 streams	Suggested reference condition
Total Kjeldahl nitrogen	106	0.288
Nitrite plus nitrate	71	0.072
Total nitrogen	24	0.221
Total phosphorus	127	0.03

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