Mary Callahan, THE PRESS DEMOCRAT
Sonoma County provides more information on blue-green algae at its website here
Sonoma County officials posted caution signs at beaches up and down the Russian River on Wednesday alerting visitors to positive test results for a potentially dangerous, naturally occurring neurotoxin linked to harmful algae, a problem surfacing around Northern California this summer.
Water samples collected at three local beaches turned up very low levels of a substance called Anatoxin-a, which is produced by certain species of blue-green algae, Sonoma County health officials said.
It’s the third year in a row the algae-related toxin has been detected in the river.
The most-recent samples were taken Monday and the test results received Wednesday, Sonoma County Health Officer Karen Milman said.
Though the level of toxin in the water “was just at the ability to detect it,” the finding triggers precautionary alerts under state guidelines, she said.
Rivergoers should be particularly watchful of dogs, which are actually attracted to harmful algae, according to studies, and, by virtue of their relative body size and habits when around fresh water, are particularly susceptible to exposure.