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King County Swimming Beach Monitoring


If you have question on this site, please contact Debra Bouchard (206) 477-4650.

Green Lake- West A734WSB

Please select a site   and a year  

This beach is currently closed

Sample Date Temperature
(°C)
Temperature
(°F)
Included in Fecal Geomean Calculation?Fecal ColiformFecal Coliform Geometric MeanGeomean – using the five most recent samples
09/15/2014 20.0 68.0 Yes717
09/08/2014 21.0 69.8 Yes6616
09/04/2014 23.0 73.4 Yes1209
09/02/2014 22.0 71.6 Nonot sampled 
08/25/2014 23.0 73.4 Yes15
08/18/2014 24.0 75.2 Yes286
08/11/2014 24.0 75.2 Yes55
08/04/2014 24.0 75.2 Yes53
07/28/2014 22.0 71.6 Yes75
07/21/2014 24.0 75.2 Yes24
07/14/2014 24.0 75.2 Yes124
07/07/2014 22.0 71.6 Yes17
06/30/2014 20.0 68.0 Yes2313
06/23/2014 20.0 68.0 Yes215
06/16/2014 18.0 64.4 Yes321
06/09/2014 21.0 69.8 Yes20017
06/02/2014 20.0 68.0 Yes14 
05/27/2014 Yes53 
05/19/2014 19.0 66.2 Yes10 
05/12/2014 16.0 60.8 Yes1 

Table Legend

Cell Color Fecal Coliform Value Concern Level
symbol for low concern symbol for low concern Individual value < 200 CFU/100 ml Low Concern - safe for swimming
symbol for moderate concern Individual value >= 200 & < 1000 CFU/100 ml Moderate Concern – still safe for swimming
symbol for high concern Individual value >= 1000 CFU/100 ml
or geometric mean >= 200 CFU/100 ml
High Concern – flagged for resample. For more information see Beach Closure Protocol – Fecal coliform bacteria
NOTE: If the routine sample exceeds the standard, either a single sample that exceeds 1000 CFU/100ml or a geometric mean of the five most recent samples that exceeds 200 CFU/100ml, then re-sampling is triggered.



Sample DateMicrocystin (µg/L)Anatoxin-a (µg/L)
10/13/20140.53500 
10/06/20140.54800<MDL
09/29/20141.02000 
09/22/20140.50000<MDL
09/15/20140.57800 
09/08/20140.70600<MDL
09/02/20148.05000 
08/25/201418.60000<MDL
08/18/20140.36000 
08/11/20140.36000<MDL
08/04/20140.34000 
07/28/20140.21500<MDL
07/21/20140.17200 
07/14/20140.34000<MDL
07/07/2014<MDL 
06/30/20140.19900<MDL
06/23/2014<MDL 
06/16/2014<MDL<MDL
06/09/2014<MDL 
06/02/20140.16000<MDL

Table Legend

Cell Color Algal Toxin Value Concern Level
symbol for low concern symbol for low concern Anatoxin < 1 µg/L and Microcystin < 6 µg/L below state recreation guideline
symbol for high concern Anatoxin >= 1 µg/L or Microcystin >= 6 µg/L value above state recreation guideline. See Swimming Beach Closure Protocol – Toxic Algae

Note: Additional toxic algae data is available on the NW Toxic Algae webpage.

ADDITIONAL ALGAL TOXIN DATA is available for Green Lake for samples submitted throught the Washington State Toxic Algae Program. For more information visit the Washington State Toxic Algae Program database website.
Washington State Toxic Algae Program Database