Another severe algal bloom will hit western Lake Erie later this summer, according to environmental scientists from the University of Michigan and the National Oceanic and Atmospheric Administration.
Last August, high levels of cyanobacteria shut down Toledo's drinking water supply.
Heavy rains in June have set up conditions for another severe bloom, ranking between an 8.1 and 9.5 on a 10-point scale. Any bloom greater than a 5.0 is of concern. Scientists say they can't predict whether there will be another "Toledo event," as that depends on how the bloom develops.