Keeping beaches safe
The Beach Environmental Assessment, Communication & Health (BEACH) Program ensures that marine water is safe to swim and play in and informs the public if water doesn't meet swimming standards.
From Memorial Day through Labor Day in 2018, we sampled 62 public high-use beaches statewide, either weekly or biweekly, for enterococcus, a type of fecal bacteria. High enterococcus levels are linked to swimmer illness.
King County saltwater swimming beaches
We monitored 10 beaches in King County from May 21 – Aug. 31, 2018. Beaches were monitored almost every week during the swimming season.
Find details about each of the King County beaches below:
Data summary: Bacteria results compared to standards
The chart below summarizes the bacteria levels at King County beaches in relation to the EPA swimming standard
or saltwater swimming criteria. Beaches are considered unsafe for swimming when the geometric mean of enterococcus/100 mL of water is greater than or equal to 35 and the statistical threshold value of enterococcus/100 mL is greater than or equal to 276. We issue a public swimming advisory when enterococcus levels reach 104 per 100 mL of water.
Table: Calculated geometric mean and statistical threshold value at King County beaches (in enterococcus per 100 mL) for 2018
||Statistical Threshold Value
|Alki Beach Park
|Carkeek Park Beach
|Dash Point State Park Beach
|Golden Gardens Beach
|Lincoln Park Beach
|Redondo County Park Beach
|Richey Viewpoint Beach
|Richmond Beach Saltwater Park
|Saltwater State Park Beach
|Seahurst Park Beach