Harmful Algal Blooms

Algae are naturally-occurring microscopic organisms that are found in fresh and salt waters of Virginia and around the world.  They produce oxygen and food for animals. Most do not harm people, wildlife, or the environment. When many algal cells multiply in the water, it is called an ALGAE BLOOM.

Blooms can change the water to appear green, red or brown. Most blooms are not harmful but some may affect fish and humans, as well as other animals like birds and marine mammals. These are called Harmful Algal Blooms (HABs).

Stay safe when recreating in natural waters by:

• Keeping children and pets out water that appears to have a film on the surface
• Avoiding water that is discolored, murky, or has an odor
• Reporting fish or deceased animals in the water to the Virginia Emergency Operations Center (VEOC) 1-800-468-8892
• Please submit your observations of algae using our HAB online report form

Consult with a care provider if you believe you are experiencing health effects from exposure to a HAB waterbody. You may also report these effects to the VDH HAB Hotline at 1-888-238-6154.