skip to main content

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  

Sample Date Temperature
(°C)
Temperature
(°F)
Included in Fecal Geomean Calculation?Fecal ColiformFecal Coliform Geometric MeanGeomean – using the five most recent samplesIncluded in E. coli Geomean Calculation?E. ColiE. coli Geometric MeanGeomean – using the five most recent samples
05/18/2015 18.0 64.4 Yes3 Nonot sampled 
05/11/2015 18.0 64.4 Yes2 Nonot sampled 

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.

Cell Color E. coli Value Concern Level
symbol for high concern Individual value >= 410 CFU/100 ml
or geometric mean >= 126 CFU/100 ml
High Concern – flagged for resample. E. coli is not used as a Washington State standard but is used as an EPA standard.


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