BOSTON ~ Boston residents are being warned of a potential health hazard in the Hyde Park/Readville neighborhood. The Boston Public Health Commission (BPHC) has issued an advisory regarding a cyanobacteria algae bloom in Sprague Pond, located in the area. The Neponset River Watershed Association first alerted BPHC of the presence of this blue-green algae after observing a fish kill and green murky water in the pond.

Upon receiving this information, BPHC took immediate action by temporarily closing Sprague Pond to the public. The decision was made after a member of Boston's Department of Parks and Recreation reported the concerning conditions at the pond. The Neponset River Watershed Association then conducted a sampling and test, which confirmed the presence of cyanobacteria.

Residents are being advised to avoid any contact with the water, keep their pets away from it, and refrain from fishing or participating in any activities near or in the pond. A map with the precise location of Sprague Pond has been provided for reference. In case of accidental contact with the water, it is recommended to rinse off immediately.

Cyanobacteria algae blooms can be harmful as they produce toxins that can make people and pets sick. These blooms can make water appear murky and sometimes even resemble pea soup or paint. The primary concern for humans is ingestion while swimming, but direct skin contact and inhalation can also cause irritation and exacerbate pre-existing respiratory conditions. For dogs, ingestion is also a concern as they may consume scum that has washed ashore or gotten onto their skin or fur.

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Symptoms such as vomiting, staggering, drooling, or convulsions should not be ignored if observed in dogs that have been around an algae bloom. In Massachusetts and other states, canine deaths have been documented due to ingestion of harmful algae.

The duration of this advisory is uncertain as algae blooms can last for weeks during summertime but may dissipate quickly. The Massachusetts Department of Public Health (DPH) will continue to monitor the cyanobacteria algae levels in the area and conduct sampling for laboratory analysis once the bloom has disappeared. DPH requires two rounds of samples collected a week apart that are below the threshold of 70,000 cells/milliliter of water to determine if the advisory can be lifted.

Residents with any questions, concerns, or in need of more information can contact the Mayor's Health Line at 617-534-5050.

The BPHC, which is the oldest health department in the country, is working towards a healthy and thriving Boston for all residents. In partnership with communities, BPHC aims to protect and promote the health and well-being of all Boston residents, especially those impacted by racism and systemic inequities. More information about their work can be found on boston.gov/bphc.

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