Tuesday August 17, 2021 4:40 p.m.

Today’s Update:

Kalmus Beach is closed (Ocean Side Only) to swimming due to high levels of Enterococci bacteria.  Both the single count and the geometric mean were exceeded.
This beach does not meet the Massachusetts Bathing Beach Regulations, 105 CMR 445.000; therefore it must be closed.  

Additional water samples were taken today and will be taken again tomorrow.  It may be several days before this beach can be re-opened again. 

Other Information/- Cyanobacteria Postings: 


  • Muddy/Crocker Pond, Marstons Mills
  • Long Pond, Marstons Mills

To protect yourself and pets:

  • Do not drink pond water.
  • Do not swim.
  • Keep pets and livestock away.
  • Avoid areas with scum while boating and do not eat fish.

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Call your doctor or veterinarian if you or your animals have a sudden or unexplained sickness or signs of poisoning.

 Warning Level 

Lovell’s Pond, Marstons Mills

 Pet Advisory Level

Shubael’s Pond, Marstons Mills

If you are interested in receiving more information about Cyanobacteria and locations monitored, you may view the CyanoMAP at https://apcc.org/our-work/science/community-science/cyanobacteria/ to see recent cyanobacteria monitoring results from APCC.  If you are interested in receiving email notifications when there is a potential toxic bloom identified by APCC, you may opt-in to the APCC toxic alerts.  In order to receive email notification for toxic alerts, click this link: https://apcc.org/our-work/science/community-science/cyanobacteria/cyanobacteria-alert/    This link will bring you to a webpage where you will be asked to enter your email address in order to receive toxic alerts. 

Thomas A. McKean, RS, CHO
Director of Public Health