ABSTRACT:ABSTRACT: The National Water Data Exchange (NAWDEX) was implemented in January 1976 as an interagency program managed and coordinated by the U.S. Geological Survey. The program is directed at improving access to existing water and water‐related data. Almost 150 organizations from the Federal, state‐governmental, local‐governmental, interstate, academic, private, and foreign sectors currently participate in the program. This article describes the NAWDEX program and contains descriptions of the types of data and services available from organizations participating in NAWDEX. A point of contact for obtaining data and services is provided for each organiz