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King County Swimming Beach Monitoring


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

Magnuson Beach 0826SB

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 samples
09/15/2014 20.0 68.0 Yes312
09/08/2014 21.0 69.8 Yes2917
09/04/2014 22.0 71.6 Yes712
09/02/2014 21.0 69.8 Nonot sampled 
08/25/2014 22.0 71.6 Yes1014
08/18/2014 23.0 73.4 Yes5812
08/11/2014 23.0 73.4 Yes159
08/04/2014 24.0 75.2 Yes57
07/28/2014 22.0 71.6 Yes1314
07/21/2014 23.0 73.4 Yes516
07/14/2014 23.0 73.4 Yes1726
07/07/2014 20.0 68.0 Yes515
06/30/2014 19.0 66.2 Yes12021
06/23/2014 19.0 66.2 Yes2323
06/16/2014 16.0 60.8 Yes6023
06/09/2014 19.0 66.2 Yes126
06/02/2014 19.0 66.2 Yes28 
05/27/2014 Yes200 
05/19/2014 15.0 59.0 Yes21 
05/12/2014 15.0 59.0 Yes110 

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)
10/27/2014<MDL<MDL
10/20/2014<MDL 
10/13/2014<MDL<MDL
10/06/2014<MDL 
09/29/2014<MDL0.01900
09/22/2014<MDL 
09/15/2014<MDL<MDL
09/08/2014<MDL 
09/02/2014<MDL<MDL
08/25/2014<MDL 
08/18/2014<MDL<MDL
08/11/2014<MDL 
08/04/2014<MDL<MDL
07/28/2014<MDL 
07/21/2014<MDL<MDL
07/14/2014<MDL 
07/07/2014<MDL<MDL
06/30/2014<MDL 
06/23/2014<MDL<MDL
06/16/2014<MDL 
06/09/2014<MDL0.01410
06/02/2014<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.


Seattle Parks Department