Take a photo, document the location, and email the Plymouth Public Health or email the Plymouth Marine and Environmental Department.
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Once a body of water is identified, the Marine and Environmental Department will place signs at the public entrance(s) to alert the public. The State Department of Public Health maintains an active list of confirmed cyanobacteria blooms on its website.
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Cyanobacteria Bloom Response Procedures (PDF)
A confirmation of cyanobacteria bloom does not necessarily indicate it is toxic. Cyanobacteria may give off microcystin toxins. However, all cyanobacteria blooms are treated as potentially toxic to ensure public health.
A bright green film that looks like "paint" in the water. May contain small white specs in the water column. Looks like an oil slick, green specks, pea green layer on the surface. View images (PDF) or visit Identifying cyanobacterial blooms and scums for more examples.