Toxic Algae Health Warning in Effect for Pattison Lake

Toxic levels are above the threshold for health concern


Submitted by Thurston County

Thurston County Public Health and Social Services is reporting a toxic algae bloom at Pattison Lake. Lab results received today show the algae bloom is producing unsafe levels of microcystin, which is a liver toxin and possible human carcinogen. Microcystin can also cause illness in livestock and pets that drink affected water. Reports show toxin levels at the sample site are 11 ug/L. The state advisory level for microcystin is 8.0 ug/L. Staff will collect samples weekly until the algae bloom clears.

When an algae bloom is present, health officials recommend taking extra precautions to avoid the health risks posed by potential toxins.

  • Do not drink the lake water
  • Avoid contact with water containing algae
  • Avoid swimming, wading, wind surfing and water-skiing in waterbodies where algae blooms are present
  • Keep pets and livestock away from where algae blooms are present
  • Do not eat fish that come from the lake during an algae bloom
  • Avoid areas of scum when boating

Warning signs are posted at the Washington Department of Fish and Wildlife boat launch.

For more information about toxic algae blooms and health risks, visit the Thurston County website.

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