Officials at Rock Creek Regional Park are urging visitors to avoid Lake Needwood after a toxic substance was found in the water.
That substance, microcystin, was produced from blue-green algae that was detected in lake water.
Maryland follows the World Health Organization's 10 parts-per-billion threshold for safe algae levels in recreational water sources. Anything above that is deemed hazardous, and the public must be warned to avoid the waters. Lake Needwood exceeded that threshold, therefore warning signs have been placed throughout the park.
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