The Rhode Island Department of Health (RIDOH) and the Rhode Island Department of Environmental Management (DEM) have advised the public to avoid contact with Flat River Reservoir, also known as Johnson’s Pond in Coventry, after confirming a cyanobacteria bloom. Cyanobacteria, or blue-green algae, can naturally occur in water bodies but may form harmful algae blooms (HABs) under certain conditions.
According to RIDOH and DEM, activities such as swimming, fishing, boating, and kayaking at Johnson’s Pond are considered high risk due to potential health hazards. The agencies warn that HABs can produce toxins dangerous to both humans and animals.
The advisory urges caution throughout all areas of Johnson’s Pond because HABs can shift locations within ponds and lakes. Residents are advised not to drink untreated water or consume fish from affected waters. Pet owners should ensure their pets do not swim in or drink from the pond.
Contact with water containing toxin-producing cyanobacteria may cause skin, nose, eye, and throat irritation. Ingesting contaminated water could result in stomachache, diarrhea, vomiting, and nausea. Less common symptoms include dizziness, headache, fever, liver damage, and nervous system issues. Young children and pets face higher risks since they are more likely to ingest water during recreational activities. Those experiencing symptoms after exposure should consult a healthcare provider.
RIDOH and DEM provided recommendations for those who come into contact with a cyanobacteria bloom: “Rinse your skin with clean water right away. Shower and wash your clothes when you get home. If your pet was exposed, wash it with clean water immediately and don’t let it lick algae from its fur. Call a vet if your pet shows signs of illness like tiredness, no eating, vomiting, diarrhea or other symptoms within a day. If you feel sick after contact, call a healthcare provider.”
Water affected by cyanobacteria blooms may appear bright to dark green with thick floating algae resembling green paint or pea soup. People are urged to keep themselves and their pets away from such waters.
Suspected cyanobacteria blooms can be reported to DEM’s Office of Water Resources by calling 401-222-4700 (Press 6) or emailing DEM.OWRCyano@dem.ri.gov with photographs if possible. More information on current advisories is available on the Freshwater Cyanobacteria Tracker Dashboard at www.dem.ri.gov/bluegreen.
