This extended abstract describes a research project to identify, list, and characterize chemical occurrence databases and datasets that can be used by states and utilities to perform source water assessments. This project included a review of available, relevant source water datasets (e.g., surface water and groundwater) that document chemical occurrence in an effort to develop a comprehensive data inventory to serve as a central resource when performing source water assessment programs (SWAPs). Data sources queried to accomplish this task included national databases and datasets available through regional and state agencies, water utilities and volunteer groups. The majority of databases and datasets included in this research project were identified as a result of the participation and cooperation of local and state agencies. The Project Team also identified national datasets and some state and volunteer groups' datasets through online research. The data collected through the state surveys and the online research were stored in a Microsoft database (2000 SQL Server(TM)) and posted in the project website. Through this site, each state participant had the opportunity to test the provided information and evaluate its content and functionality. Includes extended abstract only.