A judge dismissed a Riverhead lawsuit that sought to block Southampton from building a new sewage treatment plant key to revitalizing Riverside, an economically distressed hamlet that borders downtown Riverhead.

The ruling removes a potential impediment to Southampton Town's plan to revitalize the hamlet with new commercial and residential development. The town board approved the Riverside Sewer District in 2024 , enabling homes and businesses to connect to a future $44.6 million wastewater treatment plant. Southampton officials said the plan calls for 1,085 new units of housing and roughly 400,000 square feet of new commercial development.

Suffolk State Supreme Court Justice Paul M. Hensley dismissed the lawsuit Tuesday with a three-page decision, capping more than a year of litigatio

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