What are the health concerns associated with cyanobacteria?

A confirmation of cyanobacteria bloom does not necessarily indicate it is toxic. Cyanobacteria may give off microcystin toxins. However, all cyanobacteria blooms are treated as potentially toxic to ensure public health.

  • Advisories are not lifted until the water has been consistently clear for two weeks.
  • Animals, birds, and fish can also be affected by high levels of toxin-producing cyanobacteria.
    • If your animal goes into the water, be sure to rinse them off thoroughly.
    • If your animal ingests water and shows signs of illness, contact your veterinarian.
  • Skin irritation, stomach cramps, vomiting, nausea, diarrhea, fever, sore throat, headache, muscle and joint pain, blisters of the mouth, and liver damage.
  • Swimmers in water containing cyanobacterial toxins may suffer allergic reactions, such as asthma, eye irritation, rashes, and blisters around the mouth and nose.

Show All Answers

1. How do I know if a pond has been identified as having an active cyanobacteria bloom?
2. How do I report a cyanobacteria bloom?
3. What steps does the Town take when a resident reports a bloom?
4. What water bodies are tested in Plymouth?
5. What are the health concerns associated with cyanobacteria?
6. What does cyanobacteria look like?
7. What are the causes of cyanobacteria?
8. Where can I learn more about Cyanobacteria?