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Plymouth secured a no-cost pilot of an Aqua-Aerobics tertiary treatment system to test removal of phosphorus, nitrate, and total suspended solids before treated wastewater is discharged to groundwater. The Town has approval to begin tertiary treatment by December 2026, but removal results and full-scale costs are not yet available.
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The pilot system is being tested at the wastewater treatment plant and could provide additional treatment before discharge to the infiltration beds. Officials are analyzing phosphorus, nitrate, and suspended solids; PFAS testing was not planned at this stage. The committee also reviewed concerns about groundwater impacts, monitoring coverage, the environmental report, and possible effects on nearby wells and waterways.
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