TREPA was founded with the immediate objectives of protecting the Tusket River and surrounding areas from environmental damage due to pollution, maintaining a constant vigil for future environmental hazards and working closely with other environmental groups and government agencies to improve legislation so as to better protect the environment. 
 
Its longer term objective are to respond to all environmental concerns having an impact on the Tri-county area, to educate the public to be environmentally conscious, and to expand membership and public support within the community.