Prevention & Control
How to Reduce Exposures and Prevent Illness
It is not possible to know if an algal bloom is harmful just by looking at it. Additionally, toxins can be present even when an algal bloom is not visible.
Protect yourself and your pets from harmful algal blooms (HABs):
- Avoid entering or playing in bodies of water that:
- smell bad
- look discolored
- have foam, scum, or algal mats on the surface
- contain or are near dead fish or other dead animals (for example, do not enter a body of water if dead fish have washed up on its shore or beach)
- Follow local or state guidance if you are notified that your tap water contains algal toxins. Boiling water does not remove algal toxins and can increase the amount of toxin in the water. Be aware of advisories and health risks related to consuming contaminated fish and shellfish. For more information, see the Environmental Protection Agency's (EPA) Choose Fish and Shellfish Wisely web pages.