Warner's Pond Recreational Use Advisory
A public health advisory has been issued for Warner's Pond due to the presence of a bloom of cyanobacteria (blue-green algae) on the Gerow Park side of the pond. These blooms may produce toxins that can make pets and people sick.
In accordance with the Massachusetts Department of Public Health recreational guidelines, the Concord Board of Health strongly advises:
- Avoid skin contact with the water.
- Do not allow your pet to swim in or drink the water.
- Avoid contact with areas of algae concentration- even on shore.
- Do not let pets play in the water where a visible shoreline algae bloom or scum is seen.
- Rinse pets off immediately if they come into contact with an algae bloom.
- Do not swallow water and be sure to rinse off after contact.
Blue-green algae can form harmful blooms in lakes, ponds, and rivers that make the water murky, and can sometimes make the water look like pea soup or paint. The current bloom in Warner's Pond as of July 28 (pictured here) appears as a mixed green/blue floating scum along some areas of the pond edge. In other areas there is a visible blueish color in the water.
Blue-green algae blooms can produce toxins that can make pets and people sick.
Toxins may be present within the algae cells or in the water.
For humans, the primary concern is ingestion of water containing blue-green algae while swimming. Of secondary concern is direct skin contact with the blue-green algae and inhalation of water droplets containing blue-green algae or toxins. Boaters are advised to avoid skin contact with algae to reduce the risk of contact dermatitis (rashes)
For pets, the primary concern is the ingestion of water containing blue-green algae or scum that has washed ashore or gotten onto their skin or fur.
PETS--Call your veterinarian immediately if your pet has been around an algae bloom and shows symptoms such as vomiting, staggering, drooling, or convulsions. These symptoms present themselves fairly quickly after exposure. Animals of most concern are dogs. They have been known to eat the scum that washes ashore and/or lick scum out of their fur. In Massachusetts and in many other states, canine fatalities have been documented due to the ingestion of harmful algae.
When will this advisory be lifted?
Algae blooms may last for weeks in the summer, or may disappear quite quickly. Town staff will regularly observe Warner's Pond for the presence of a visible algae bloom over the coming days. The recreational water use advisory will remain in effect at least until the visible bloom and shoreline scum subsides.
For more information:
Understanding Cyanobacteria | Concord, MA
Cyanobacterial Harmful Algal Blooms (CyanoHABs) & Water | Mass.gov