The Ridge Club is a twenty-four home community and golf club on Cape Cod. Because Cape Cod has a fragile sole source aquifer that is sensitive to nitrogen loading, the state required that half of the homes be placed on denitrifying
treatment systems. The developer chose to install a shared system for all of the homes because the initial capital cost, and costs for installation and operation & maintenance (O&M), were significantly lower for the entire cluster system than they were for twelve smaller individual systems.
The treatment plant is owned by the 24 home owners and funds for O&M and replacement costs are accrued under a community trust agreement. O&M costs for the shared system are approximately 10% of what the costs would have
been had half of the homes installed an individual system.