About a year ago the Iowa Policy Project released a report on cyanobacteria in drinking water supplies and recreational waters. A new report from the Environmental Working Group shows things have not gotten better.
Microcystin and other cyanotoxins are still not regulated by the U.S. Safe Drinking Water Act. Thus, few drinking water systems test for them. These very dangerous natural chemicals are still on EPA’s candidate list for regulated contaminants but they have made it no further.
When it comes to beach monitoring for the same substances, Iowa still does not use the EPA’s recommended action level and prefers to use on more than twice as high, making any notice to beachgoers of the presence of microcystin less likely.
In high amounts cyanotoxins can make you sick and cause serious long term damage to human health. There are many reports of dogs dying after playing in ponds and licking their fur after.
The EWG report also found further evidence of what we reported last year in our report.
“The late summer months are usually the peak of the algae bloom season, though recent outbreaks are starting earlier and lasting longer. Increased rainfall and rising temperatures caused by the climate crisis are exacerbating the issue.”
Later peaks in blooms and toxins means that the beach monitoring system will not see them since it ends in Iowa on Labor Day. True fewer people will be at beaches, but water supplies are vulnerable later into the year and no one is looking for microcystin in October.
Three weeks after IPP released its report in June 2018, the city of Greenfield, Iowa, closed its drinking water system for about a week because microsystin got in finished water. One wonders if in another three weeks after Thursday’s release we might see another town in the same predicament.
 Environmental Working Group, Aug. 8, 2019: “Report: Toxins From Algae Outbreaks Plague Hundreds of Lakes in 48 States,” https://www.ewg.org/release/report-toxins-algae-outbreaks-plague-hundreds-lakes-48-states