The Rhode Island Department of Health (RIDOH) and the Rhode Island Department of Environmental Management (DEM) advise people to avoid contact with Polo Lake and the Japanese Gardens in Roger Williams Park in Providence because of potential risks from blue-green algae. Georgiaville Pond in Smithfield and Carbuncle Pond in Coventry are currently being investigated for potential blue-green algae blooms The ponds are not under advisories at this time, but the public is asked to avoid any waters that are cloudy and green, or that have surface scum.
The advisories that RIDOH and DEM have issued for several other bodies of water in Rhode Island is still in place. These bodies of water are:
• Almy Pond in Newport • Sisson Pond in Portsmouth • JL Curran Reservoir in Cranston • Mashapaug Pond in Providence • Melville Ponds in Portsmouth • Pleasure Lake in Roger Williams Park in Providence • Roosevelt Lake in Roger Williams Park in Providence • Elm Lake in Roger Williams Park in Providence
With the exception of Deep Spring Lake, the ponds in Roger Williams Park are all interconnected. Any area of the park's waters could develop a bloom, and visitors should avoid any areas that are green and discolored.
Blue-green algae can produce toxins, including microcystins, that can harm humans and animals. All recreation, including swimming, fishing, boating, and kayaking, should be avoided. People should not ingest water or eat fish from these waters. Pets can also be affected by exposure to the algal toxins and thus owners should not allow pets to drink or swim in the water. The advisory will remain in effect until further notice.
Contact with water containing blue-green algae commonly causes irritation of the skin, nose, eyes, and/or throat. Common health effects associated with ingesting water containing algal toxins include stomach ache, diarrhea, vomiting, and nausea. Rarer health effects include dizziness, headache, fever, liver damage, and nervous system damage. Young children and pets are at a particular risk for health effects associated with algal toxins. People who have had contact with these ponds and experience those symptoms should contact their healthcare provider.
If you come into contact with the water, rinse your skin with clean water as soon as possible and, when you get home, take a shower and wash your clothes. Similarly, if your pet comes into contact with the water, immediately wash your pet with clean water. Do not let the animal lick algae off its fur. Call a veterinarian if your animal shows any symptoms of blue-green algae poisoning, including loss of energy, loss of appetite, vomiting, diarrhea, or any unexplained sickness that occurs within a day or so after being in contact with water. People are cautioned that toxins may persist in the water after the blue-green algae bloom is no longer visible.
Sisson Pond is a drinking water source maintained by Newport Water. Newport Water's primary goal is to provide safe drinking water for all of its customers. As the main drinking water supplier for the residents of Newport, Middletown, and Portsmouth, Newport Water serves nearly 70,000 people. Even when a cyanobacteria bloom is present in a pond, the treated water that Newport Water distributes to homes is safe. Treatment removes harmful bacteria, including cyanobacteria, before the water is delivered to customers. Newport Water follows all state and federal drinking water testing and monitoring requirements to assure that treatment processes are working correctly and the treated water is safe to drink. Drinking untreated water from any pond at any time is not recommended. Newport Water may deliver treated drinking water from nine potential surface reservoirs or pond sources including: St. Mary's Pond, Sisson Pond, Lawton Valley Reservoir, South and North Easton Ponds, Gardiner Pond, and Paradise Pond located on Aquidneck Island, Nonquit Pond in Tiverton, and Watson Reservoir in Little Compton. While RIDOH and RIDEM are now issuing a public health advisory for Sisson Pond, Newport Water's other water supply ponds also routinely experience blue-green algae (cyanobacteria) blooms.
State law prohibits both people and animals from swimming and bathing in ponds that are drinking water sources. In addition, Newport Water prohibits fishing, swimming, and boating in these reservoirs, as posted. It is possible that blue-green algae blooms may be affecting other waterbodies in Rhode Island. People are advised to avoid contact with waterbodies that exhibit bright green coloration in the water or at the water surface and/or dense floating algal mats that form on the water's surface. The water may look like green paint, thick pea soup, or green cottage cheese. Most algae blooms occur in the summer and fall, but they can occur at any time of year.
To report suspected blue-green algae blooms, contact DEM's Office of Water Resources at 222-4700 or DEM.OWRCyano@dem.ri.gov If possible, send a photograph to accompany the reported condition.