King County annual BEACH report

We monitored 10 beaches in King County from June 1 through Aug. 31, 2020:

  • 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 2020, we sampled 63 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 June 1 – Aug. 31, 2020. Beaches were monitored 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 30 and the statistical threshold value of enterococcus/100 mL is greater than or equal to 110. We issue a public swimming advisory when enterococcus levels exceed 104 per 100 mL of water.

Table: Calculated geometric mean and statistical threshold value at  King County beaches (in enterococcus per 100 mL) for 2020.

Beach

GM

STV

Alki Beach Park

12

18

Carkeek Park

15

16

Dash Point State Park

9

11

Golden Gardens

16

32

Lincoln Park

12

15

Redondo County Park

16

56

Richey Viewpoint

17

31

Richmond Beach Saltwater Park

10

14

Saltwater State Park

12

22

Seahurst Park

10

14