What a possible bloom can look like
Algae are a normal part of aquatic ecosystems. A harmful algal bloom, or HAB, occurs when an algal growth creates harmful toxins, low oxygen, or other environmental and health impacts.
Possible warning signs include surface scum, foam, mats, unusual streaks, paint-like color, or an unpleasant odor. Color alone cannot confirm whether a bloom is toxic.
When in doubt, stay out. Do not drink, swim, fish, or let pets enter water that may contain a harmful bloom. Avoid touching the water and follow local advisories.
If a person or pet may have been exposed
- Leave the water immediately.
- Rinse exposed skin or fur with clean fresh water.
- Do not let a pet lick contaminated fur.
- Contact a medical professional, veterinarian, poison-control resource, or public-health authority if symptoms occur or exposure was significant.
Reduce the conditions that feed blooms
Use fertilizer carefully, maintain septic systems, control soil erosion, pick up pet waste, and keep organic debris and nutrient-rich runoff out of storm drains and waterways.