Cyanobacteria Alert – August 20 2026

“When in Doubt, Please Stay Out.” A potentially toxic cyanobacteria bloom has been detected in: • Hamblin Pond, Barnstable The town has been notified of the findings. If you have any questions, contact the local health department. You can view the most recent sampling date and results on our interactive map. Avoid contact, particularly incidental […]
Cyanobacteria Alert – August 19 2026

Above: Stillwater Pond, Chatham, on August 18, 2026 “When in Doubt, Please Stay Out.” A potentially toxic cyanobacteria bloom has been detected in: • Stillwater Pond, Chatham The town has been notified of the findings. If you have any questions, contact the local health department. You can view the most recent sampling date and results […]
Cyanobacteria Alert – August 18 2026

Above: Fawcetts Pond, Barnstable, on August 17, 2026 “When in Doubt, Please Stay Out.” A potentially toxic cyanobacteria bloom has been detected in: • Fawcetts Pond, Barnstable The town has been notified of the findings. If you have any questions, contact the local health department. You can view the most recent sampling date and results […]
APCC Cyanobacteria Info Series #4

Cyanobacteria Series – #4 Testing for Cyanotoxins In our last installment of this cyanobacteria info series, we looked at why cyanotoxins can be present even when there is no obvious surface scum. This time, we want to take a closer look at cyanotoxin detection, and why understanding toxin presence involves more than a single test […]
Cyanobacteria Alert – August 13 2026

Above: Lower Shawme Lake, Sandwich on August 12, 2026 “When in Doubt, Please Stay Out.” A potentially toxic cyanobacteria bloom has been detected in: • Lower Shawme Lake, Sandwich The town has been notified of the findings. If you have any questions, contact the local health department. You can view the most recent sampling date […]
Cyanobacteria Alert – August 11 2026

Above: Long Pond Marstons Mills, Barnstable on August 10, 2026 “When in Doubt, Please Stay Out.” A potentially toxic cyanobacteria bloom has been detected in: • Long Pond Marstons Mills, Barnstable The town has been notified of the findings. If you have any questions, contact the local health department. You can view the most recent […]
APCC Cyanobacteria Info Series #3

Cyanobacteria Series – #3 Presence of Cyanotoxins In our last installment of APCC’s cyanobacteria info series, we explained that blooms don’t always appear as clear, visual green surface scums. Cyanobacteria can also be present as tiny particles or larger clumps suspended throughout the water, and a pond’s appearance can change throughout the day as sunlight, […]
Cyanobacteria Alert – August 6 2026

“When in Doubt, Please Stay Out.” A potentially toxic cyanobacteria bloom has been detected in: • Hamblin Pond, Barnstable • Sheep Pond, Brewster The town has been notified of the findings. If you have any questions, contact the local health department. You can view the most recent sampling date and results on our interactive map. […]
Cyanobacteria Alert – August 5 2026

Above: Wing Pond, Falmouth on August 4, 2026 “When in Doubt, Please Stay Out.” A potentially toxic cyanobacteria bloom has been detected in: Wing Pond, Falmouth The town has been notified of the findings. If you have any questions, contact the local health department. You can view the most recent sampling date and results on […]
APCC Cyanobacteria Info Series #2

Cyanobacteria Series – #2 What to look for and how to protect yourself and your pets from possible exposure. Cyanobacteria blooms can look like green paint, pea soup, floating or submerged mats, small particles in the water, or a scum line on the shore. Cyanobacteria blooms are often blue or green, or sometimes brown, red, […]


