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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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Algae Scrubber to Help Baltimore's Harbor - In an attempt to cure Baltimore’s ailing harbor, advocates and authorities have tried many gadgets such as a floating wetlands, a solar-powered aerator, and even a trash wheel. This year an algal turf scrubber will be used to tackle the algae problem.

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