23 June 2021
The State Water Resources Control Board (State Water Board) and Sonoma County Department of Environmental Health Services advise caution for anyone who boats, fishes or swims after harmful algal blooms (HABs) were discovered in multiple Sonoma County rivers. Because children and dogs are most susceptible to serious health impacts, it is recommended that they avoid touching any suspicious-looking algal material found in the water or along river banks.
State Water Board and Sonoma County staff responded to recent sightings of suspected HABs in the Russian River, Salmon Creek and Gualala River. Lab results confirmed that potentially toxic algal mats are growing on the bottom of rivers and may detach and become stranded on banks.
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