The city’s drinking water advisory due to cyanotoxin contamination was lifted after four days
The city of Salem, Ore., lifted a drinking water advisory following two consecutive test results that showed toxin levels had returned to below the health advisory. The drinking water advisory was due to the detection of two chemicals—cylindrospermopsin and microcystin—detected in the city’s water distribution system and believed to be sourced from algae blooms in the Detroit Lake that flowed downstream.
While the city received preliminary data detecting the toxins on Friday, May 25, they did not issue a do not drink advisory for vulnerable parties until May 29, according to the The Statesman Journal. Now, as the water remains below advisory levels, the city continues to monitor a new algae bloom that has erupted in the Detroit Reservoir in the Tumble Creek area east of Mongold.
The drinking water advisory affected approximately 185,000 people who’s municipal water is sourced from the North Santiam River. Microcystin was found as high as 48.21 ppb, above the 4 ppb health advisory, and cylindrospermopsin was found as high as 1.9 ppb, a level nontoxic to adults. No illnesses have been reported yet and the city continues to monitor developing algae blooms.