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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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Lake Whatcom Water Quality Issues - The lack of oxygen is caused by algae growth which is fed by large quantities of phosphorous. The phosphorous comes from the soils and hillsides, but also comes from fertilizers and animal waste. In the summer of 2009 the city of Bellingham had to restrict water use because there was so much algae in the lake which was clogging the filters on the city water pipe and making it hard for water to get through.


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