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Mystic River Watershed

Environmental Challenges for the Mystic River Watershed


Bacterial Challenges

Reducing high levels of bacteria in the Mystic River has been a top priority for The Mystic River Watershed Initiative.

Elevated bacteria levels are primarily caused by the following sources:

  • Illicit sewage discharges to storm drain systems
  • Combined Sewer Overflows (CSO)
  • Uncontrolled urban stormwater runoff that contains pet and animal waste

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Nutrient Challenges

Nutrients, primarily phosphorus, are a chief culprit for dramatic algae blooms that plague the River with blue-green algae during the summer months.

These "blue green" algae blooms, are a form of bacteria known as Cyanobacteria, whose cells may release a toxin when they die. Exposure to the toxin can cause skin rashes and irritate the nose, eyes or throat, and if ingested can lead to serious liver and nervous system damage. Other harmful effects of the algae include reduced water clarity, nuisance scum, and reduced oxygen in the water which is necessary for a healthy fish habitat.

For more information on Nutrient Challenges.

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