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Protecting Great Hill Pond for future generations

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Cyanobacteria Bloom: Great Hill Pond has an active cyanobacteria bloom, verified by Chatham Health District. See the notice for current guidance and the full timeline.

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Public safety notice: cyanobacteria bloom

Active bloom, verified by Chatham Health District

Great Hill Pond has an active cyanobacteria bloom, verified by Chatham Health District. Chatham has posted warning signs at several public access points advising against contact with dense surface accumulations or water that appears green.

Avoid any water that looks solid green or blue-green, and avoid contact with any mats, films, or scums along the shoreline.

For the full timeline of reports, test results, and Chatham's visits, see the Treatment Log on the Projects page.

Read the full cyanobacteria bloom log →

About Us

Portland's Hidden Gem

Friends of Great Hill Pond is a volunteer-run 501(c)(3) nonprofit organization dedicated to preserving and improving the health and recreational value of Great Hill Pond in Portland, Connecticut. Our community depends on this cherished natural resource for swimming, fishing, kayaking, and gathering.

Through community fundraising, conservation efforts, and environmental monitoring, we work to ensure Great Hill Pond remains vibrant and accessible for residents and visitors for generations to come.

Hydrilla Watch: This highly invasive aquatic weed is spreading in Connecticut waterways and is not yet in Great Hill Pond. Early detection is critical — know what to look for and report any sightings immediately.

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Current Projects What we're working on Donate Support the pond Financial Details Transparency & accountability Report Hydrilla Know the signs. Report sightings.

Support Great Hill Pond

Friends of Great Hill Pond is a registered 501(c)(3) nonprofit organization run entirely by volunteers in and around the Great Hill Pond community.

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