Toxin Monitoring (Lake Erie)
How to Read the Data
Field monitoring for HABs occurs on a weekly basis in Lake Erie during HAB season (July – October). The Date Stamp indicates the most recent monitoring date. 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 HAB toxin microcystin was detected, but below health advisory levels for drinking 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.
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