Snohomish County BEACH report

Washington State University (WSU) Snohomish County Extension Beach Watchers sampled six beaches in Snohomish County weekly or biweekly during the 2024 season. 

  • Edmonds Marina Beach Park
  • Edmonds Underwater Park
  • Mukilteo Lighthouse Park
  • Picnic Point County Park
  • Howarth Park
  • Jetty Island

Mukilteo Lighthouse Park Beach in Snohomish 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. Sampling takes place from Memorial Day to Labor Day. During this time, you can check out current water quality conditions on the swimming map.  

Six beaches in Snohomish County were monitored in 2024 by Washington State University (WSU) Snohomish County Extension Beach Watchers. Beaches were monitored weekly or biweekly with the exception of Jetty Island, which was sampled biweekly starting after the July 4th holiday.

See details on each beach below.


Data summary: Bacteria results compared to standards

The chart below summarizes the bacteria levels at Snohomish 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 Snohomish County beaches (in enterococcus per 100 mL) for 2024.

Beach GM STV
Edmonds Marina Park 12 19
Edmonds Underwater Park 11 16
Mukilteo Lighthouse Park            12          22
Picnic Point County Park            13          26
Howarth Park 21 83
Jetty Island 12 15