Environment
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January 29, 2009
Are sewage treatment plants hurting the sound?
Early findings from a study by the Washington State Department of Ecology show that water discharged from sewage treatment plants is a major source of nitrogen in Puget Sound and may be contributing to low dissolved oxygen levels that hurt fish.
People living in the Puget Sound watershed have led to a doubling of nitrogen entering South Puget Sound from the watershed. During certain times of the year, humans add at least 10 times the natural levels of nitrogen.
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