Blue-Green Algae

The Wisconsin Department of Health Services states that there are many types of algae present in all bodies of water within Wisconsin. Algae makes up an important part of any aquatic ecosystem. However, blue-green algae is not a true algae, and is known to produce toxins that can be harmful to human and animal health.
 

Health Risks from Blue-Green Algae

Inhaling, swallowing, or coming into contact with toxins produced by blue-green algae can cause humans and animals to become sick.

Symptoms may include:

• Respiratory symptoms, such as coughing, congestion, sore throat, and/or difficulty breathing
• Eye irritation
• Itchy skin
• Hives
• More serious symptoms may include vomiting, diarrhea, and severe abdominal pain
   

If you think you have blue-green algae related illnesses, contact your doctor and report the incident to the Wisconsin Harmful Algal Blooms Program at 608-266-1120. You can also fill out the Harmful Algae Bloom (HAB) Illness or Sighting Survey.

If you think that the body of water you are on has an algae bloom:

• Do not boat, swim, or ski through algal scum or blooms

• Do not fish where algal scum is present

• Shower off with soap and water after swimming in lakes, rivers, and ponds

• Do not let your dog drink water where an algae bloom is present

• Rinse your dog off with clean water after swimming
   

Algal blooms have diverse appearances. Many form a thick layer of scum that may look like paint or pea soup. Algal blooms can be a variety of colors, including blue, green, brown, white, or even dark red. They may also be accompanied by foul odor and stained or cloudy water.
 

More Resources on Algae:

• Photos of algal blooms
• Blue-Green Algae: Understanding Blue-Green Algae
• Health Concerns Related to Harmful Algal Blooms
• Staying Safe and Healthy in Wisconsin's Lakes: What You Need to Know about Blue-Green Algae
  • Cómo mantenerse seguro y saludable en los lagos de Wisconsin Lo que necesita saber sobre las algas verdeazuladas