© Oregon State University
A report concludes that blooms of toxic cyanobacteria, or blue-green algae, are a poorly monitored and underappreciated risk to recreational and drinking water quality in the United States, and may increasingly pose a global health threat.
Several factors are contributing to the concern. Temperatures and carbon dioxide levels have risen, many rivers have been dammed worldwide, and wastewater nutrients or agricultural fertilizers in various situations can cause problems in rivers, lakes and reservoirs.
No testing for cyanobacteria is mandated by state or federal drinking water regulators, according to scientists from Oregon State University, nor is reporting required of disease outbreaks associated with algal blooms. But changes in climate and land use, and even increasing toxicity of the bacteria themselves, may force greater attention to this issue in the future, the researchers said.
An analysis outlining the broad scope of the problem has been published in Current Environmental Health Reports, by scientists from OSU and the University of North Carolina. The work was supported by the U.S. Geological Survey and the National Science Foundation.
The researchers also noted that problems with these toxins reach their peak during the heat of summer — as they are doing right now.
In 2015, drought and low snow pack throughout the West has led to large and toxic algal blooms earlier than in previous years. Toxic blooms have occurred for the second consecutive year in the Willamette River near Portland, Ore., and Upper Klamath Lake and most of the Klamath River have health…