As of Friday, May 22, 2026, the following water quality updates have been issued:
- A Pet Advisory is issued for Hamblin Pond, Marstons Mills, due to increased levels of cyanobacteria in water quality samples.
- A Pet Advisory is issued for Mystic Lake, Marstons Mills, due to increased levels of cyanobacteria in water quality samples.
Current postings as of Friday, May 22, 2026:
Current Pet Advisories:
Hamblin Pond, Marstons Mills
Mystic Lake, Marstons Mills
If you are interested in receiving more information about Cyanobacteria and locations monitored across Cape Cod, please view the Association to Preserve Cape Cod (APCC) 2025 Cyanobacteria Monitoring Map at https://apcc.org/our-work/science/community-science/cyanobacteria/
Thomas A. McKean, RS, CHO
Director of Public Health
TOWN OF BARNSTABLE