What is a blue-green algae bloom?
Blue-green algae are bacteria that have qualities like algae and other plants. These bacteria are cyanobacteria - cyan means "blue green" - and are commonly found on land and in lakes, rivers, ponds, or other bodies of contained water.
Warm temperatures, sunlight and slow-moving or stagnant waters with lots of nutrients can accelerate the growth or “bloom” of blue-green algae. Within days, a clear body of water can be covered with it. Although these algae can be annoying and impact water quality, it’s often non-toxic. However, some can produce toxins that can cause illness in humans, pets and other animals. In some cases, toxic blooms can kill livestock and pets that drink the water.
A blue-green algae bloom:
- Often looks like green paint floating on the water, but can look bluish, brownish, or reddish green.
- Can be several inches thick around the shoreline.
- Is hard to pick up or hold because of how small the individual “blooms” are.
- Is most common in the summer and fall but can occur anytime.
Signs of a toxic bloom may include:
- Dead fish, waterfowl, or other animals.
- Sudden, unexplained sickness or death of a cat or dog, especially if it has algae on its mouth, legs, or feet.
- Skin rashes on humans after being in the water.
Eventually the toxins break down in the water and are destroyed naturally.
What if I see a bloom?
If you see a bloom, you, your family and your pets should avoid contact with the water and call the Chelan-Douglas Health District’s Environmental Health Office at (509) 886-6400. If you see a bloom, or suspected bloom at a Chelan County PUD managed shoreline please contact us at (509) 663-8121.