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Advisory committee reviews plan to expand Harriman wastewater plant from 6M to 9M gallons

Orange County Sewer District No. 1 Advisory Committee · February 18, 2026
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Summary

Chairman Peter Tuohy told the advisory committee the Harriman Wastewater Treatment Plant expansion will move the facility from 6 million to 9 million gallons using a modular Sequential Batching approach; SEQRA and the Final EIS are complete and the county is the lead agency.

Chairman Peter Tuohy summarized the committee’s history and the rationale for the Harriman Wastewater Treatment Plant expansion, saying the advisory committee was formed in March 2019 after a 2016–17 study identified needs at the plant. He noted the county completed a Draft and Final Environmental Impact Statement and that SEQRA review is finished with the county as lead agency.

Tuohy described the chosen treatment approach as "Sequential Batching," a modular plan to increase capacity while working within the site footprint. He explained the plant has three 2-million-gallon trains (6 million total) and said the plan is to convert a 2-million-gallon train into a 7-million configuration to reach 9 million gallons, with the option to repeat the conversion for other trains when additional capacity is needed. Tuohy also said the committee is pursuing various grants to support the project.