EPA Designated Sole Source Aquifers (Feature Service)

The Sole Source Aquifer datalayer was compiled by the Department of Environmental Protection (DEP) Division of Water Supply (DWS). Seven Sole Source Aquifers have been designated by the US Environmental Protection Agency (EPA) for Massachusetts. A Sole Source Aquifer (SSA) is an aquifer designated by US EPA as the 'sole or principal source' of drinking water for a given aquifer service area; that is, an aquifer which is needed to supply 50% or more of the drinking water for that area and for which there are no reasonably available alternative sources should that aquifer become contaminated. More details... Map service also available.唯一水源含水层（Sole Source Aquifer）数据图层由环境保护署（Department of Environmental Protection，DEP）供水司（Division of Water Supply，DWS）编制。美国环境保护署（US Environmental Protection Agency，EPA）已为马萨诸塞州划定7处唯一水源含水层。唯一水源含水层（Sole Source Aquifer，SSA）是指由美国环境保护署划定的、为指定含水层服务区域提供唯一或主要饮用水水源的含水层；具体而言，该含水层需为对应区域供应50%及以上的饮用水量，且若该含水层遭受污染时无合理可用的替代水源。更多详情……亦可获取地图服务。