Over 30 years ago water planners combined their knowledge of groundwater with policy mechanisms to protect Cape Cod drinking water. Adoption of Wellhead Protection Areas was a major strategy to protect the land area that receives precipitation to recharge the pumping wells. Today, each town has zoning and Board of Health bylaws to protect their wellhead protection areas, which are collectively shown. In addition, the public embraced acquisition of land for protection for wellhead areas through local, regional and state actions like the Cape Cod Land Bank. The Wellhead Protection Areas are also referred to as DEP Zone IIs where state regulations (310 CMR 22) and Cape Cod Commission RPP minimum performance standards prohibit or limit land uses that are potentially detrimental to water quality. DEP regulations do not specifically prohibit large publicly owned wastewater treatment works in Zone 11’s, but the RPP limits their use in Zone IIs for the restoration of water quality.