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Algae information

This information is provided by the Environmental Toxicology Program within the Department of Public Health.
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Guidelines

Guidelines for Cyanobacteria at Recreational Freshwater Locations 
Guidance for Local Health on Responding to CyanoHABs (English, PDF 1.43 MB)
Guidance for Local Health on Responding to CyanoHABs (English, DOCX 4.99 MB)

Fact Sheets

Harmful algae blooms in freshwater bodies 

This fact sheet is also available to download in these languages: Spanish, Portuguese, Simplified/Traditional Chinese, Haitian Creole, Khmer, Russian and Vietnamese.

Microcystis and Anabaena fact sheet 
Red tide fact sheet 

Find out information about red tide. The printer-friendly and Spanish versions of this fact sheet can also be downloaded.

Educational materials

Identifying cyanobacterial blooms and scums (photographs of blooms and scums) 
Animal Safety Alert Fact Sheet 

Presentations

Recreational Risk Management of Surface Waterbodies: Cyanobacteria Surveillance in Massachusetts (English, PPTX 1.04 MB)
Recreational Risk Management of Surface Waterbodies: Cyanobacteria Surveillance in Massachusetts (English, DOCX 80.35 KB)

Related links

CDC's Harmful Algal Bloom (HAB) information 

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