Use the radio buttons to select a toxin or to filter by date range and site type.
|Range of Toxin Concentrations|
|detect - 0.29||detect - 0.19||detect - 0.69||detect - 19.99|
|0.3 - 1.59||0.2 - 0.79||0.7 - 2.99||20 - 79.99|
|1.6 - 19.99||0.8 - 2.99||3.0 - 19.99||80 - 299.99|
|>= 20.0||>= 3.0||>= 20.0||>= 300|
|Concentration Units µg/l - micrograms per liter|
|Site Type by Shape|
|Public Water System Finished Water||Lakes & Reservoirs|
|Markers on the map show sites sampled for the selected cyanotoxin during the selected time period. Marker color indicates that one or more results for that time period were within the range indicated by the marker color. Marker shape indicates the type of sampling site.|
Public Drinking Water thresholds for microcystin and cylindrospermopsin are based on a 10-day exposure.
|All threshold values are reported in µg/L.|
|Type of Advisory||MYC *||ANA||CYL||SAX*|
|Recreational Public Health Advisory||6||80||5||0.8|
|Elevated Recreational Public Health Advisory**||20||300||20||3|
|Drinking Water: Do Not Drink Advisory
(for bottle-fed infants and children younger than school age)
|Drinking Water: Do Not Drink Advisory (for all)||1.6||20||3||1.6|
|Drinking Water: Do Not Use Advisory||20||300||20||3|
MYC - Microcystins; ANA - Anatoxin-a; CYL - Cylindrospermopsin; SAX - Saxitoxin*Microcystin and Saxitoxin thresholds are intended to be applied to total concentrations of all reported cogeners of those toxins.
|**An Elevated Public Health Advisory will be issued at a public state park beach or boat ramp when cyanotoxin levels are equal to or exceed the Elevated Recreational Public Health Advisory thresholds.|
About the data: Public Water Systems monitor for cyanotoxins as required per the HAB Rules (finalized June 1, 2016) and the 2015 Harmful Algal Bloom Strategy. Ohio EPA also monitors inland lakes for cyanotoxins in watersheds being assessed for their Total Maximum Daily Load (TMDL). Ohio EPA-collected samples are analyzed at Ohio EPA's Division of Environmental Services (DES). Data sampled by Public Water Systems are analyzed at either their own lab or a commercial lab.
About the map: The map contains symbols of varying shapes and colors to indicate the site type (i.e., public water system finished water, lake and reservoir) and the concentration range for each toxin. The map is defaulted to show all microcystin results for the past 30 days. This can be changed or refined by choosing a different date range, sampling site type, or toxin. The colors of the symbols relate to the concentration of each toxin for the date range and sampling site type selected.
Drinking Water Do Not Drinkadvisory threshold.
Recreational Public Healthadvisory threshold.
Recreational No Contactand the
Drinking Water Do Not Useadvisory thresholds.
* Map also includes Ohio River water quality data collected by ORSANCO.