As the largest municipal biosolids composting operation in New England, the Hawk Ridge Compost Facility’s main purpose is the beneficial reuse of the solids produced in treating wastewater.Operated by Casella Organics, the site in Unity serves more than 30 treatment plants in Maine and surrounding states, turning biosolids into Class A compost. “Many of our customers have been with us since we opened in 1990,” says Jen McDonnell, director of sales and marketing. “Many large wastewater treatment plants around the area are anchor customers for us.”As the first private company certified under the Biosolids Management Program through the National Biosolids
