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Toxic Algae in Lake Needwood
Lake Needwood is a 75 acre reservoir located in Derwood, Maryland. The lake was created to provide flood control to Rock Creek and to protect the creeks water quality by acting as a retention basin to trap sediment from stormwater runoff.

This past fall Lake Needwood posted warning signs to “Avoid contact with Lake Water” after testing positive for toxic algae. Harmful algal blooms are often triggered by excessive levels of nutrients such as nitrogen and phosphorus. The excess nutrients come from many sources such as aquatic plants and fertilizers and stimulate the growth of algae.

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Legislative Support to Combat Aquatic Invasive Species in Minnesota - The Minnesota Department of Natural Resources has produced findings on the condition of our lakes and rivers that can’t be ignored. The DNR has identified bodies of water that are infested with a number of invasive aquatic plants, including nearly 300 lakes with infestations of Eurasian water milfoil. Nearly 200 lakes and rivers are infested with zebra mussels.


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