Casella Waste Systems is permanently closing its Hawk Ridge Compost Facility in Unity, Maine, after state regulators found dangerously high levels of toxic PFAS chemicals. The site, Maine’s largest composting facility, processed out-of-state sewage sludge for decades. Testing revealed PFAS levels far above safety limits, raising concerns about groundwater contamination. Casella plans to complete cleanup by June 2026. The closure underscores growing efforts to regulate PFAS pollution in compost and biosolids nationwide.

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