Falmouth advisory panel outlines watershed permit plans to cut nitrogen; sewer outfall and denitrification options detailed

Steven Rafferty, chair of the Town of Falmouth’s Water Quality Management Committee, told the Zoning Board of Appeals that the committee’s preliminary watershed plans target reductions in nitrogen loading across the town’s estuaries under recently promulgated Massachusetts DEP watershed permit regulations and Title 5 revisions.

“We filed a notice of intents, one for each of the 14 estuaries,” Rafferty said, explaining the committee chose a staggered approach so municipalities do not have all monitoring and plan‑preparation obligations at once. He described the regulatory backdrop, including total maximum daily limit (TMDL) sentinel targets: “For example, in Great Pond, the nitrogen concentration should not be above 0.4. It’s currently in the 0.8 range,” Rafferty said.

Rafferty explained the tradeoffs local leaders face in achieving reductions. The state’s planning arithmetic uses a 35 mg/L baseline for sewage nitrogen; advanced on‑site treatment systems are…