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Grays Harbor County BEACH report

Three beaches in Grays Harbor County were sampled weekly from May 22 through Sept. 1, 2017:

  • Westhaven State Park, Half Moon Bay
  • Westhaven State Park, South Jetty
  • Westport, The Groynes

All three beaches are popular surfing beaches. They all had good water quality with little or no bacteria present during most sample events. Details on each beach are presented in the text below.

Westhaven South Jetty Beach - Open sandy beach with several bathers and blue sky

South Jetty beach at Westhaven State Park

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.

During the 2017 beach season, 62 public beaches on coastlines were sampled from Memorial Day through Labor Day. High-use beaches were sampled weekly or biweekly for enterococcus, a type of fecal bacteria. High enterococcus levels are linked to swimmer illness.

Grays Harbor County swimming beaches

We sampled three beaches in Grays Harbor County weekly from May 22 through Sept. 1, 2017. All three beaches are popular surfing beaches, and they all had very good water quality with little or no bacteria present during most sample events. See below for more details on each beach.

Westhaven State Park, Half Moon Bay

During the monitoring period, Half Moon Bay had excellent water quality. This beach met swimming standards during all periods sampled.

Westhaven State Park, South Jetty

South Jetty had excellent water quality. This beach met swimming standards during all periods sampled.

Westport, The Groynes

The Groynes beach had excellent water quality. This beach met swimming standards during all periods sampled.

Data summary: Bacteria results compared to standards

The chart below summarizes the bacteria levels at Grays Harbor 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 Grays Harbor County beaches
(in enterococcus per 100 mL) for 2017
Beach> Geometric Mean Statistical Threshold Value
Westhaven State Park, Half Moon Bay <10 <10
Westhaven State Park, South Jetty <10 10
Westport, The Groynes <10 <10