Objective To understand the sanitary quality of ground water in countryside of Tongzhou District, Beijing, and to provide basic data for water improvment in countryside in future.

• 目的了解北京市通州区农村地下水水质卫生状况,为今后农村改水提供基础资料。方法采用分层抽样方法监测北京市通州区各乡自备井水源水。