Lake Lawrence is under a toxic algae advisory for the second time this season

After lab samples were taken on June 15, microcystin levels were more than double the state safety threshold, according to Thurston County Public Health & Social Services.

The test results showed microcystin at 16.5 µg/L, well above the state recreation guideline of 8.0 µg/L. Microcystins are a liver toxin classified as a possible human carcinogen. They can also sicken pets and livestock that drink contaminated water.

A previous advisory at Lake Lawrence was lifted May 26 after two consecutive weeks of clean samples. The lake is now back under restrictions.

Separately, the county issued a swimmer's itch advisory for Ward Lake on Thursday, June 18, after receiving a report from a swimmer who appears to have contracted the parasitic skin rash. The condition, caused by microscopic parasites released from infected snails, generally resolves on its own but can cause tingling, burning, and itching.

Thurston County PHSS said swimmers at any freshwater lake should be aware the parasite may be present.

What residents should know:

For Lake Lawrence, the county advises: do not swim, water ski, or allow pets near areas with visible algae. Do not drink lake water. Use only catch-and-release fishing and do not eat fish caught during the bloom. The advisory remains in effect until two consecutive weekly samples come back below 8.0 µg/L.

Even if the lake appears visually clear, toxins may still be present, according to PHSS.

Ward Lake's advisory has no set end date. The 66.8-acre lake, popular for trout and kokanee fishing, remains open but swimmers should towel off immediately after exiting the water.

Offutt Lake, tested the same day as Lake Lawrence, showed microcystin at just 0.45 µg/L and has no advisory in effect.

Residents can sign up for lake advisory email alerts through the county website or report algae blooms by calling 360-867-2626 or emailing [email protected].