Sanitary Survey Due Dates

All public drinking water systems in Alaska must undergo a sanitary survey every 3 or 5 years, depending on their system classification. The described GIS feature layer provides two key pieces of information for each system statewide: The date of the most recent sanitary survey, and The due date for the next required survey. This tool is designed to help state-certified Sanitary Surveyors identify regions where multiple surveys may be needed at the same time, supporting better planning and reduced statewide travel costs. The data is sourced directly from the Safe Drinking Water Information System (SDWIS) and is updated daily, ensuring surveyors have current information.阿拉斯加州所有公共饮用水系统需根据其系统类别，每3年或5年开展一次卫生调查（sanitary survey）。本数据集所述的地理信息系统（Geographic Information System, GIS）要素图层，可为全州范围内的每个公共饮用水系统提供两项核心信息：最近一次卫生调查的完成日期，以及下一次强制卫生调查的截止日期。本工具旨在帮助经州政府认证的卫生调查员（Sanitary Surveyors）识别需同时开展多项卫生调查的区域，助力优化规划工作并降低全州范围内的差旅成本。该数据集直接源自安全饮用水信息系统（Safe Drinking Water Information System, SDWIS），每日更新以确保调查员可获取最新信息。