In a pivotal meeting on June 12, 2025, the Nantucket Board of Health voted unanimously to implement a 90-day moratorium on variance applications for new construction that propose using innovative alternative (IA) septic systems to accommodate more bedrooms than allowed without a variance. This decision aims to allow the board to gather essential data and expert insights to make informed decisions regarding the island's long-term health and environmental sustainability.

Board members expressed concerns about the adequacy of current information, emphasizing the need for a comprehensive understanding of the implications of new construction on Nantucket's drinking water supply and septic systems. "We don't know what we don't know," one member stated, highlighting the urgency of the moratorium to collect evidence-based information.

The moratorium will not affect applications to replace or upgrade failed systems, provided there is no increase in flow, ensuring that necessary repairs can continue without delay. The board discussed the timeline for the moratorium, ultimately agreeing to set a specific expiration date of September 18, 2025, rather than a fixed number of days, to align with their regular meeting schedule.

This decision reflects a commitment to balancing development with environmental stewardship, as board members acknowledged the need for clearer guidelines based on comprehensive data. The board aims to establish a more informed framework for future construction projects, ensuring that Nantucket's unique ecosystem is preserved for generations to come.