The Association to Preserve Cape Cod (APCC) tests Jenkins Pond every two weeks for cyanobacteria, which are microscopic bacteria that live in water. A large growth of these bacteria results in algal blooms that can pollute the water and may even be toxic to animals and people. The most recent test (July 13) was collected off a Sandpointe Shores beach and was at a level called  "Potential for Concern". 

APCC describes "Potential for Concern" as follows: At the time and place of sampling, results indicate either moderate risk for potential exposure to cyanobacterial toxins approaching but below state standards, or a likelihood for increasing cyanobacteria risk over the next days to weeks. While these conditions may pose low health risks to most adults, risks are higher for children, or pets. Children and pets are more likely to be exposed to toxins if contaminated water or scum are incidentally ingested. Children may inadvertently consume cyanobacterial cells while swimming or when they interact with scum in the sand on the shore. Pet exposure can result from directly drinking pond water, grooming after swimming, or eating scum on the shore. Due to lower body masses, children and pets are more susceptible to cyanobacterial risks than adults.

Note that Jenkins Pond is large enough that a positive test for cyanobacteria in one place does not mean that there is a problem everywhere on the lake - and a negative test doesn't mean that the whole lake is problem free. While we will do our best to promptly share results via signs, Facebook posts and emails, we encourage all PBIA members to learn how to detect cyanobacteria so you can avoid it. You can learn more at 

https://www.falmouthma.gov/1179/Cyanobacteria-in-Freshwater-Ponds

and at

https://apcc.org/our-work/science/community-science/cyanobacteria/