Toxin Monitoring (Saginaw Bay)
How to Read the Data
Field monitoring for HABs occurs bi-weekly in Saginaw Bay during the HAB season (July – October). The Date Stamp indicates when the most recent monitoring data was collected. Year:Month:Day
Different shapes at monitoring sites indicate at which water depth the sample was taken. Squares are scum samples taken from the very top of the water column only when scum is visibly present. Circles are surface samples taken at approximately 0.75 m below the water surface. Triangles are bottom samples taken 1 m above the lake bottom.
The color scale on this map follows public health advisory levels used by the Ohio Environmental Protection Agency. Green indicates that the toxin, microcystin, was detected in the water. Yellow indicates that a drinking water advisory is in effect for sensitive populations, because microcystin levels were measured greater than 0.3 ug/L. Orange indicates a drinking water advisory is in effect for everyone, because microcystin levels were greater than 1.6 ug/L . Red indicates that the public should avoid all body contact with the water, because microcystin levels greater than 20 ug/L were detected.
Visit This Page Often?
Visit NOAA GLERL’s website for a deeper look into our research on harmful algal blooms. CIGLR supports the mission and goals of the NOAA Great Lakes Environmental Research Lab, and collaborates with them to develop these next-generation NOAA forecasts. Read the disclaimer.
Explore other resources on Great Lakes harmful algal blooms.
Learn more about past and upcoming stakeholder events associated with this project.
Take our user survey to help us improve our website and forecast products.