Harmful Algal Blooms

Information for Public Water Systems

harmful algal bloom on a lakeCyanobacteria (also known as blue-green algae) are microscopic organisms found naturally in surface water that can sometimes multiply to form harmful algal blooms (HABs).  HABs can potentially produce toxins capable of causing illness or irritation -- sometimes even death -- in pets, livestock, and humans.  In addition to producing toxins, cyanobacteria can pose other treatment challenges for public water systems including taste and odor and shortened filter run times. The information below is provided to assist public water system operators with preventing, identifying and responding to HABs.


Funding Opportunities for Cyanotoxin Testing Equipment and Infrastructure Improvements

Guidance for Conducting ELISA Testing for Microcystin

Ohio EPA Director Craig W. Butler recently visited three Ohio drinking water plants to award grants to purchase equipment, supplies and training for analysis of toxins associated with harmful algal blooms (HABs) and discuss how the state and communities are cooperating to protect local water supplies.

Prevention and Treatment

Learn more about types of treatment to address HABs: