Arsenic, a known human carcinogen, occurs naturally in groundwater in New Jersey and many other states and countries. A number of municipalities in the Piedmont, Highlands, and Valley and Ridge Physiographic Provinces of New Jersey have a high proportion of wells that exceed the New Jersey maximum contaminant level (MCL) of 5 µg/L. Hopewell Township, located in Mercer County and the Piedmont Province, has a progressive local ordinance which requires the installation of dual-tank, point-of-entry treatment systems on affected wells. This provided a unique study opportunity. Of the 55 homes with dual-tank POE treatment systems recruited into this study, 51 homes (93%) had arsenic levels under the MCL at the kitchen sink, regardless of years in service and/or maintenance schedule adherence. Based on the study participants’ water consumption and arsenic concentrations, we estimate that Hopewell's arsenic water treatment ordinance, requiring POE dual-tank arsenic treatment, reduced the incidence of excess lifetime (70-year) bladder and lung cancers from 121 (1.7 cancer cases/year) to 16 (0.2 cancer cases/year) preventing 105 lifetime cancer cases (1.5 cases/year). Because the high risk of cancer from arsenic can be mitigated with effective arsenic water treatment systems, this ordinance should be considered a model for other municipalities.

砷是一种已知的人类致癌物，天然存在于新泽西州和许多其他州和国家的地下水中。新泽西州的皮埃蒙特，高地，山谷和里奇自然地理省的许多城市的水井比例超过了新泽西州的最大污染物水平（MCL）5 µg / L。位于Mercer县和皮埃蒙特省的Hopewell镇有一项渐进的地方法规，该法规要求在受影响的井上安装双罐进入点处理系统。这提供了独特的学习机会。在这项研究中招募的55个采用双罐POE处理系统的房屋中，有51个房屋（93％）在厨房水槽的MCL下具有砷含量，而与服役和/或维护计划的遵守时间无关。根据研究参与者的耗水量和砷浓度，我们估计合和的要求进行POE双罐砷处理的砷水处理条例减少了121例（1.7例癌症）的过度寿命（70年）膀胱癌和肺癌的发生率/年）至16（每年0.2例癌症）预防105例终生癌症（每年1.5例）。由于可以通过有效的砷水处理系统减轻砷引起癌症的高风险，因此该条例应视为其他市政当局的典范。2个癌症病例/年）可预防105例终生癌症病例（1.5例/年）。由于可以通过有效的砷水处理系统减轻砷引起癌症的高风险，因此该条例应视为其他市政当局的典范。2个癌症病例/年）可预防105例终生癌症病例（1.5例/年）。由于可以通过有效的砷水处理系统减轻砷引起癌症的高风险，因此该条例应视为其他市政当局的典范。