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FOR IMMEDIATE RELEASE: Friday, October 12, 2018
Jane Mountjoy-Venning, Senior Environmental Health Specialist, (360) 867-2643 or venninj@co.thurston.wa.us 

Toxic Algae Advisory for Lake Lawrence Lifted, Pattison Lake Advisory in Effect

​OLYMPIA –   Thurston County Public Health and Social Services has lifted the toxic algae-related advisory for Lake Lawrence after all sample results for the last two weeks show that microcystin toxin concentrations in the water were less than six micrograms per liter, the level of public health concern. The Washington Department of Fish and Wildlife boat launch has been reopened.

The highest sample, taken September 25, measured microcystin at 215 micrograms per liter. The Washington State Department of Health advisory level for microcystin is six micrograms per liter.

However, Pattison Lake is now under a toxic algae bloom advisory. Thurston County PHSS received lab results showing that a sample collected on October 8 contains microcystin at a concentration of 41 micrograms per liter. Microcystin is a liver toxin which accumulates over time. High accumulation of this toxin can cause sickness, or even death.

PHSS advises residents and users of Pattison Lake to:

  • Not swim, fish, or use the lake for recreation.
  • Not allow pets to swim in, or drink water from the lake.

Residents and users of County lakes can report algae blooms and sign up for email updates and advisories for county lakes by calling Thurston County PHSS at (360) 867-2626.

"We appreciate it when lake residents and users let us know when blooms are present so we can investigate, said Jane Mountjoy-Venning, Senior Environmental Health Specialist. "Algae blooms can appear at any time of the year.

For more information about blue-green algae, visit the County's Blue-Green Algae Advisories website.


County Commissioners:

Carolina Mejia
District 1

Gary Edwards
District 2

Tye Menser
District 3