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Mercury levels in this King County treatment plant hovered around 2.5 parts per million (ppm) of mercury through the end of the last decade. King County began outreach efforts in 2002 - 2003, and levels seem to be leveling off at 1.4 ppm.
Mercury in Sewage Sludge/ Biosolids
Biosolids as an Indicator of the Effectiveness of Mercury Reduction Programs
Copyright © Washington State Department of Ecology. See http://www.ecy.wa.gov/copyright.html.
