Seattle Parks and Recreation Jesús Aguirre, Superintendent
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Green Lake Alum Treatment Study

Address: 7201 East Green Lake Dr N
Parks General Information
: 206-684-4075

In 2014, Parks hired Herrera Environmental Consultants to prepare the Green Lake Phytoplankton study. The purpose of the evaluation was to identify short-term and long-term effects of the 1991 and 2004 alum treatments on the amount and type of phytoplankton (algae and cyanobacteria) in Green Lake. The study analyzed phytoplankton and water quality, developed cyanobacteria monitoring protocols, and developed a number of recommendations for water quality management and public education in order to protect recreational use and public health. The study was finalized in January, 2015.

This June 2003 report presents the results of a study conducted to determine the optimal approach for treating Green Lake with alum. This study includes a water quality and fisheries data compilation, alum literature review and dose calculation, alum dose testing, alum treatment technical specifications, permit requirements, and cost estimate. The study findings are presented below for each of these elements.

Updated January 19, 2016
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