Guidance Manual for Conducting Sanitary Surveys of Public Water Systems: Surface Water and Ground Water Under the Direct Influence (GWUDI)

This manual provides guidance on how to conduct a sanitary survey of surface water and ground water under the direct influence (GWUDI) of surface water drinking water systems. A comprehensive sanitary survey is an important element in helping water systems protect public health. This manual is intended to help sate agencies improve their sanitary survey programs where needed and to help ensure consistancy in how surveys are conducted and documented across state sanitary survey programs.