The Tisbury, Massachusetts, board of health set new denitrification rules for the Lake Tashmoo and Lagoon Pond watersheds. The area covers much of the town on the north side of Martha’s Vineyard.
Rules require onsite technology that meets a nitrogen groundwater discharge standard of no more than 13 mg/L from septage or removes 75% of septic nitrogen waste, reported The Martha’s Vineyard Times.The regulation applies to new construction, an onsite system replacement, a change in property use that would increase nitrogen discharge beyond the board-approved system capacity, and if there is a determination by the board that a new system is
