The Instructor's Guide and Reference Manual are intended for use in conducting technical assistance seminars for state and local agency personnel responsible for state public water supply programs under the Federal Safe Drinking Water Act. The overall objective of training conducted using these materials is to provide the minimum training that, when complemented by on-the-job training, will enable personnel to perform effective evaluations of small public water supply systems for potential health and safety violations. Personnel attending training where these manuals are used by an instructor should have a basic knowledge of water supply systems and some limited on-the-job experience of conducting a sanitary survey under the immediate direct supervision of an experienced agency inspector. These manuals do not provide technical detail on every facet of a water system, nor are they intended to provide an inspector with the ability to provide technical assistance.