Health officials warn Portage residents after toxin detected in Austin Lake

A water sample from Austin Lake in Portage tested positive for a harmful toxin, prompting the Kalamazoo County Health and Community Services Department to issue a public health advisory Wednesday.

The sample, collected on May 27, came back positive for microcystin, a type of cyanobacteria commonly known as blue-green algae. The bacteria can produce toxins that pose health risks to people and animals.

"People and pets should avoid swallowing lake water and direct contact with any water that appears blue-green," the health department said in its advisory.

Officials say recreational activities on the lake can continue with caution. But water sports that create spray, such as jet skiing or tubing, can worsen exposure by causing additional irritation to the skin, eyes, nose, and throat.

What to look for in the water

Residents should avoid contact with water that looks blue-green, has a green sheen, or resembles spilled paint on the surface, according to the health department.

Exposure to microcystin can cause a range of symptoms in humans, including:

  • Skin irritation
  • Gastrointestinal issues
  • Respiratory symptoms
  • In severe cases, neurological symptoms or organ damage

If you believe you have been exposed and are experiencing symptoms, the health department recommends contacting your doctor or calling Poison Control at 800-222-1222.

Pets at higher risk

Officials are especially urging pet owners to keep animals away from the water. Symptoms of cyanotoxin illness often appear faster in animals than in people, sometimes within minutes to a few hours.

Warning signs in pets include:

  • Vomiting
  • Diarrhea
  • Fatigue
  • Staggered walking
  • Excessive drooling
  • Convulsions

Deaths have been reported in animals exposed to harmful algal blooms, according to the health department. If your pet comes into contact with the water, officials say to rinse them off with fresh water immediately and contact a veterinarian.

Testing continues

The State of Michigan Bureau of Laboratories will test the samples for confirmation and to determine microcystin levels, according to WXYZ 13. Further water testing is underway.

Harmful algal blooms most commonly occur in summer and fall and can last anywhere from a few days to several months, officials said.

For more information, residents can visit michigan.gov/habs or contact the Kalamazoo County Health and Community Services Environmental Health Division at 269-373-5210.