Summer Water Quality sampling on Green Lake begins on May 3rd and continues through October 18th. Sampling is done approximately every two weeks, on either 12 Sundays, or 12 Monday mornings.
The King County Lake Stewardship Program provides sampling equipment, training, and support. The samples are collected at an anchored float located at the deepest part of the Lake, approximately in front of the Hearthstone residences. This year’s sampling will continue the sampling done by Friends of Green Lake volunteers from kayaks every summer since 2004. The resulting data were used to help evaluate the effectiveness of the 2004 Alum Treatment and plan for the 2016 Treatment.