View the State of Ohio

Harmful Algal Bloom Response Strategy

Algal blooms have become more noticeable in Ohio’s lakes, streams and rivers during the last few years. Although most blooms are green algae and not harmful, there are some that are actually a type of cyanobacteria and have the ability to produce toxins – called Harmful Algal Blooms (HABs). 

HABs are also a new and evolving science. Because not everything is known about when toxins are produced and released, we have created a new tiered advisory system for Ohio’s beaches. 

The new advisory has three levels:

  • Algal Bloom Advisory
  • Public Health Advisory
  • No Contact Advisory

Be alert for local beach advisories and changing water conditions. Here are a few common sense things you can do to keep your family and pets safe this summer while enjoying Ohio’s waterways:

  • Before you go to a beach, check the state’s website www.ohioalgaeinfo.com to see if there is an algal bloom advisory.
  • If you’re at a beach and you see surface scum or something that looks like blue-green algae, report it to Ohio EPA by completing the HAB report form and emailing it to HABmailbox@epa.ohio.gov.
  • Be alert and avoid unusual water conditions, especially areas where there is floating scum or the water is generally discolored. Use common sense – When in doubt, stay out!
  • Immediately rinse family members, pets and yourself after swimming in natural waters. HABs cannot always be seen, smelled or tasted.
  • Ingesting any source of untreated water is unsafe, so never allow your family members or pets to drink lake or river water.

Remember, you can still boat, fish and recreate in Ohio’s lakes, streams and rivers. Just be aware that HABs exist. We hope this website will give you a better idea of what HABs can look like and provide you with the information you need to safely enjoy the waterways of Ohio.


What should I know now?


E. Coli Beach Sampling Results from the Ohio Department of Health

During the summer months, the Ohio Department of Health (ODH) samples selected public beaches along Lake Erie for E. coli bacteria. The presence of this bacteria in beach water is a good indicator of pollution that could be potentially harmful to swimmers.

When the amount of bacteria in the water exceeds state standards, beaches are posted with signs that advise against swimming. ODH's site will allow you to view current sample results to determine the risks for swimming.

Ohio EPA logo

Contact the Division of Surface Water
Mailing Address: P.O. Box 1049, Columbus, OH 43216-1049
Street Address: 50 West Town Street, Suite 700 Columbus, OH 43215
Phone: (614) 644-2001 ~ Fax: 644-2745 ~ E-mail
Emergency Response Hotline (800) 282-9378