Why are some lakes turning brown and green?

Lake color depends in part on what's in the water, but factors such as water depth and surrounding land use also matter. Compared with blue lakes, green or brown lakes have more algae, sediment and organic matter, says Xiao Yang, a hydrologist at Southern Methodist University in Dallas.



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Lakes turn brown due to an increase in dissolved organic matter. DOM is transported from the watershed and soil into lakes. As the land recovers from acidification, more organic material is released in the soil and flows into lakes.

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The green color of many lakes comes from high concentrations of chlorophyll containing algae. Green lakes can support a large number of fish and other organisms, but also may produce harmful algal blooms. Image credit: UCLA Institute of the Environment and Sustainability.

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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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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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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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Brown algae (Various genera) are free-floating in the water column and make the water appear brown or stained. They can be confused with other pond problems such as turbidity and tannin staining.

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Spending time in natural bodies of water—like oceans, lakes, and rivers—is a great way to enjoy the outdoors with family and friends. While this can help you stay active, it is important to know that the water we swim, play, wade, and relax in can also spread germs and make you, and those you care about, sick.

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Know before you go Before you head out, check online to find out if the swim area is currently monitored, is under advisory, or has been closed for health or safety reasons. This is especially important after a heavy rain.

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