Toxic Algae Health Advisory in Effect for Clear 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 Clear Lake.

Lab results show toxin levels of Microcystins at the sample site at Clear Lake are 10 ug/L and Anatoxins below method detection limit. The state advisory level for Microcystins is 8.0 ug/L and 1.0 ug/L for Anatoxin.

Microcystins are a liver toxin and possible human carcinogen. Microcystins can also cause illness in livestock and pets that drink affected water. Staff will collect weekly samples until the algae bloom clears. Warning signs are posted at the boat launch. 

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. 

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

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