2018 Cyanobacteria Bloom Maps

Toxic Blooms 

Cyanobacteria blooms on Seneca Lake in September of 2018 produced a toxin called microcystin.  Exposure to microcystin can negatively affect your health or the health of your pet.

  • If your skin comes into contact with microcystin, you may develop a rash, hives, or skin blisters.
  • Swallowing water containing microcystin may cause gastrointestinal symptoms such as stomach pain, nausea, vomiting, diarrhea, severe headaches, and fever.
  • Inhaling water droplets containing microcystin can cause runny eyes and nose, cough, and sore throat, chest pain, asthma-like symptoms, or allergic reactions.
  • Exposure to large amount of microcystin can cause liver damage.

Microcystin levels measured in micrograms per liter.