When a good bloom goes bad Algal blooms are natural events—and most are harmless, even beautiful. But problems arise when the wrong species bloom in the wrong numbers.

Washoe Lake is under a harmful algal bloom watch advisory, according to the Nevada Department of Conservation and Natural Resources.

Blue-green algae, formally known as cyanobacteria, take their colloquial name from the plant-coloured pigments produced during photosynthesis—and their blooms are nothing new to Alberta lakes.

The threat of “harmful algal blooms,” which can jeopardize drinking water supplies and the public’s health, is spreading across the state.

Health officials in Massachusetts are spreading the word about harmful blooms of cyanobacteria in the state.

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The city of Martinez has issued a public advisory due to a possible harmful algal bloom at the Martinez Marina, warning visitors to avoid contact with the water and to take necessary precautions.

A lake-wide harmful algal bloom has overrun Utah Lake, and the Department of Environmental Quality is warning swimmers and others to stay out of the water.

Utah Lake and Jordan River face harmful algal blooms, prompting advisories for visitors. State officials advise against swimming, drinking, or allowing pets near affected waters.

Health officials are warning residents to avoid the water of Brookline Reservoir and Crystal Lake in Newton because of algae blooms. Both bodies of water have blooms of a blue-green algae known as ...

Under such conditions, some algal blooms, including those containing cyanobacteria, dinoflagellates and diatoms, can produce toxins that cause illness when ingested.

The town is warning both people and their pets to stay out of six ponds due to cyanobacteria blooms, also known as blue-green algae, in the water.