The Instructor's Manual and Student's Text 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 seminars conducted through the use of 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. Personnel attending training where these manual are used by an instructor should have a basic knowledge of water supply systems and some limited on-the-job experience of sanitary surveys conducted by experienced agency personnel. It must be stressed that these manuals provide only 'need-to-know' information; that is, only the basic questions, and their rationale and importance that an inspector needs to know to adequately evaluate a water system. These manual 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.