MassDEP Approved Zone I (Feature Service)

As stated in 310 CMR 22.02, Zone I means the protective radius required around a public water supply well or wellfield. For public water system wells with approved yields of 100,000 gpd or greater, the protective radius is 400 feet. Tubular wellfields require a 250-foot protective radius. Protective radii for all other public water system wells are determined by the following equation: Zone I radius in feet = (150 x log of pumping rate in gpd) - 350. This equation is equivalent to the chart in the Guidelines and Policies for Public Water Systems. A default Zone I radius or a Zone I radius otherwise computed and determined by the Department shall be applied to transient non-community (TNC) and non-transient non-community (NTNC) wells when there is no metered rate of withdrawal or no approved pumping rate. In no case shall the Zone I radius be less than 100 feet. See full metadata. A map service is also available.根据310 CMR 22.02的规定，I区（Zone I）指公共供水井或供水井场周边所需的防护半径。对于获批产水量为100,000加仑/天（gallons per day，gpd）及以上的公共供水系统水井，其防护半径为400英尺；管式供水井场的防护半径为250英尺。其余所有公共供水系统水井的防护半径均通过以下公式计算：I区防护半径（英尺）= 150 × 以gpd为单位的抽水量的对数 - 350。该公式与《公共供水系统指南与政策》中的图表等效。当未计量取水量或未获批抽水量时，需采用默认I区防护半径，或由主管部门另行计算确定的I区防护半径，应用于临时非社区（transient non-community，TNC）及非临时非社区（non-transient non-community，NTNC）水井。无论何种情形，I区防护半径均不得低于100英尺。详见完整元数据。此外还提供地图服务。