Five beaches in King County have high levels of bacteria, according to the local health department. One has toxic algae.

A number of Minnesota cities have reported blue-green algae blooms this summer, causing the temporary closing of some beaches ...

Several popular swimming areas in Putnam County have been temporarily shut down due to harmful algae blooms and elevated ...

Several popular swimming areas in Putnam County have been temporarily shut down due to harmful algae blooms and elevated ...

Officials have closed off swimming at beaches in at least six states due to high bacteria levels. Here's where those closures ...

A team of researchers is tapping into the ocean’s vast body of free-floating environmental DNA to catch blooms before they ...

People are being warned about the presence of blue-green algae in the water on the Norfolk Broads at South Walsham.

A new study led by Harvard biologists describes how some sea slugs consume algae and incorporate their photosynthetic ...

The blooms have become an annual problem in the Great Lakes. DNA studies show what’s growing there and why it’s dangerous.

Winnipesaukee saw record cyanobacteria blooms, amid warmer temperatures and an increase in nutrients that feed the bacteria.

At last check, the Massachusetts Department of Public Health reported 18 beach closures due to excessive bacteria.