The Illinois Environmental Protection Agency is warning against coming in contact with water populated by algal blooms.
Their strong color can make the water pea-green, blue-green or reddish-brown. Foam or scum often forms on the surface near the bloom.
Bonnett warns against swimming, boating or other water activities that include coming in contact with or swallowing water that has algal blooms.
Testing showed the most common algal toxin to be below harmful levels until last year’s drought. The toxin can cause rashes, asthma-like symptoms, abdominal pain or liver damage.