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Thurston County, Washington

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Updated - Toxic Algae Health Advisory in Effect for Lake Lawrence

Note: Results for an algae sample collected from Lake Lawrence on 07/05/2023 reported Microcystin at 0.6ug/L which is below regulatory limits. With two weeks of consecutive sampling BELOW advisory levels, the public health advisory has been LIFTED.

OLYMPIA – Thurston County Public Health and Social Services is reporting a toxic algae bloom at Lake Lawrence. Lab results show toxin levels of Microcystins at the sample site at Lake Lawrence are 28 ug/L and Anatoxins <MDL. 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 and other locations around the lake. 

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:  


CONTACT:    Renae Miller, Public Information Specialist – Public Health & Social Services, 360-463-0362 or 

Public Health and Social Services
Press Release
Closures, Health

Questions and inquiries regarding News Release content should be directed to the Thurston County Public Information Officer:  

Meghan Porter

Anna Rhoads