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County Zip Code City
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Type of Advisory
Recreational Public Health
Recreational No Contact
Drinking Water: Do Not Drink
(Bottle-fed infants and children younger than school age)
Drinking Water: Do Not Drink (for all)
Drinking Water: Do Not Use
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About This Map
Harmful Algal Bloom Advisories are issued at Ohio State Park Beaches or at Public Water Systems where Harmful Algal Blooms have been identified. This map is updated Monday through Friday and displays only active advisories. read more...
Imagery
No active advisories for harmful algal blooms at state park beaches or public water systems at this time.


Harmful Algal Bloom Advisory Levels


Recreational Public Health Advisory - a Recreational Public Health Advisory sign will be posted at beaches when toxin levels exceed the recommended threshold, warning individuals who are elderly or very young and people with compromised immune systems that swimming or wading is not recommended.
Recreational No Contact Advisory - a No Contact Advisory sign will be posted when toxin levels exceed the recommended threshold and there are one or more probable cases of human illness or pet deaths attributable to HABs. This sign will warn people that unsafe toxins are present in the water and to avoid any contact.
Drinking Water Advisory - Do Not Drink (bottle-fed infants and children younger than school age) - a Do Not Drink Advisory will be issued for bottle-fed infants and children younger than school age when the toxin levels exceed the recommended thresholds. Alternative water should be used for drinking, making infant formula, making ice, brushing teeth, and preparing food. Healthy school age children and adults may use the water. Do not boil the water.
Drinking Water Advisory - Do Not Drink (for all) - a Do Not Drink Advisory will be issued when the toxin levels exceed the recommended thresholds. Alternative water should be used for drinking, making infant formula, making ice, brushing teeth, and preparing food. Healthy adults may use the water for bathing, washing hands, washing dishes and doing laundry. Do not boil the water.
Drinking Water Advisory - Do Not Use - a Do Not Use Advisory will be issued when the toxin levels exceed the recommended thresholds. Alternative water should be used for all purposes. Do not boil the water.



Numeric Cyanotoxin Thresholds
All threshold values are reported in ug/L
Type of AdvisoryMicrocystin *Anatoxin-aCylindrospermopsinSaxitoxin*
Recreational Public Health Advisory68050.8
Recreational No Contact Advisory**20300203
Drinking Water: Do Not Drink Advisory
(for bottle-fed infants and children younger than school age)
0.3200.70.2
Drinking Water: Do Not Drink Advisory (for All)1.62030.2
Drinking Water: Do Not Use Advisory20300203
*Microcystin and Saxitoxin thresholds are intended to be applied to total concentrations of all reported cogeners of those toxins.
**A No Contact Advisory is issued when toxin levels exceed the recommended threshold and there are one or more probable cases of human illness or pet deaths attributable to HABs.


Notes: ppb - parts per billion; ug/L - micrograms per liter; Microcystin, Anatoxin-a, Cylindrospermopsin and Saxitoxin are the Cyanotoxins tested for at Ohio state park beaches and at public water systems.