Why do lakes turn green in late summer?

Green Algae Most species are microscopic and live in lakes, ponds, and streams. Large quantities of such algae may color an entire lake and appear like green paint. Green algae blooms are often found during early to mid-summer months.



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Algae are everywhere, in oceans, in freshwater lakes and riv- ers, on land, and even in the air we breathe. Sometimes called pond scum or seaweed, they are a natural part of any aquatic environment.

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If you see a bloom, stay out of the water and keep your pets and livestock out of the water. You cannot tell if a bloom is harmful by looking at it, so it is best to use caution and stay away. Do not fish, swim, boat, or play water sports in areas where there are harmful algae or cyanobacteria.

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Minerals are a common cause of changing water color, but lakes can also be affected by soil runoff, sediment, algae, and sometimes just our eyes. Over time, water can cause rocks to weather, breaking apart and dissolving the minerals released from the stones' surface.

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How to Reduce Lake Muck and Algae
  1. Step 1: Increase Aeration. The most effective way to reduce algae, muck and other problems in a lake or farm pond is to increase aeration. ...
  2. Step 2: Add Regular Treatments of Bacteria & Sludge Remover. Water treatments for lake sludge and algae come in two forms: proactive and reactive.


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Green Lake toxic algae Swim only where a lifeguard is present. Do not swim in other areas. Keep pets out of the lake. Do not drink lake water.

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