North Falmouth septic help: two harbor nitrogen limits and no sewer in sight

The moraine, Megansett and the Buzzards Bay shore

North Falmouth runs along the Buzzards Bay side of town from the Bourne line south toward West Falmouth, with Old Silver Beach, Megansett and Wild Harbor on the water and the Buzzards Bay moraine behind. The census place counted 3,084 people in 2010, a summer heavy village of year round houses and seasonal cottages. There is no public sewer here. Each lot has its own system, many built when a cesspool was normal, and the ground ranges from stony moraine that can slow a perc test to sandier pockets near the shore. When a Title 5 inspection turns up a cesspool or effluent at the surface, the fix is a septic replacement on the same lot.

Megansett Harbor and its June 2020 limit

Most of North Falmouth drains to the Megansett Squeteague Harbor system, which it shares with Cataumet and Pocasset in Bourne. MassDEP finalised a nitrogen limit for the system in June 2020, after Megansett Harbor was listed as impaired for nitrogen. The Cape Cod Commission’s subembayment table assigns about 61% of the controllable load to Falmouth and 39% to Bourne, and septic systems are the largest piece of it. A MassDEP table of watershed permit filings, dated August 2025, lists Megansett Harbor with a notice of intent, the step that lets a town take a watershed permit instead of a house by house nitrogen rule.

West Falmouth Harbor and the 30 system project

The south end of the village slopes to West Falmouth Harbor, where every home along the shore uses septic or a cesspool. When the state set the harbor’s nitrogen limit in 2008, the Buzzards Bay Coalition reported it was taking in about four times that amount, partly from the old discharge of the town wastewater plant and partly from septic. A Coalition demonstration begun in 2016 put 30 nitrogen reducing systems on properties around the harbor, and early results on the first 20 showed nitrogen cut by at least 78%. Nearby, the Coalition appealed a town wastewater permit to protect Herring Brook, which reaches the bay at Old Silver Beach.

The town BANRT rule, permits and money

Falmouth’s FHR 15.15, posted in November 2025, requires Best Available Nitrogen Reducing Technology for new construction and for added design flow in the town’s nitrogen regulated areas; check with the Health Division whether your lot is inside one before designing an I/A system. Every repair needs a Disposal Works Construction Permit from Town Hall. As a Barnstable County village, North Falmouth can use the Cape Cod AquiFund loan and the state septic tax credit. The Falmouth page has town fees, Bourne shares Megansett to the north, and the service areas page lists every town and village.

Sources: 2010 census count via Wikipedia (North Falmouth CDP; a 2020 CDP figure was not found); Megansett Squeteague Harbor final nitrogen TMDL (MassDEP, June 2020) and EPA approval; town split via the Cape Cod Commission 208 subembayment table for Falmouth; watershed permit filing via the MassDEP watershed permit application table (20 Aug 2025); West Falmouth Harbor 2008 limit, demonstration project and Herring Brook appeal via Buzzards Bay Coalition news items; FHR 15.15 via the town Septic Systems page (November 2025 notice); all read 11 Nov 2026. Gap: falmouthma.gov did not load; rule text and nitrogen area maps not read, ask the Health Division.