Several factors are contributing to the concern; wastewater nutrients or agricultural fertilizers in various situations can cause problems in rivers, lakes and reservoirs.
“The biggest health concern with cyanobacteria in sources of drinking water is that there’s very little regulatory oversight, and it remains unclear what level of monitoring is being voluntarily conducted by drinking water utilities,”
People should also develop an awareness of what cyanobacteria look like, in a natural setting appearing as green, paint-like surface scums. They should avoid water recreation on a lake or river that has these characteristics, researchers said.
Cyanobacterial toxins are not destroyed by boiling.