King County annual BEACH report

We monitored 10 beaches in King County from May 21 through Aug. 31, 2018:

  • Alki Beach Park
  • Carkeek Park Beach
  • Dash Point State Park
  • Golden Gardens
  • Lincoln Park
  • Redondo County Park
  • Richey Viewpoint
  • Richmond Beach Saltwater Park
  • Saltwater State Park
  • Seahurst Park

Golden Gardens beach in King County

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

Beach Geometric Mean Statistical Threshold Value
Alki Beach Park 16 38
Carkeek Park Beach 11 16
Dash Point State Park Beach 10 14
Golden Gardens Beach 18 63
Lincoln Park Beach 16 42
Redondo County Park Beach 13 20
Richey Viewpoint Beach 22 72
Richmond Beach Saltwater Park 13 20
Saltwater State Park Beach 12 21
Seahurst Park Beach 16 30