The EPA's Environmental Monitoring Methods Index (EMMI) software assists users in comparing and evaluating analytical methods applicable to environmental pollutants of interest. EMMI combines rapid search capabilities with a user-friendly interface. EMMI allows the user access to an extensive list of analytes and analytical methods. It provides CAS numbers, regulatory lists, and regulatory limits. The database also contains method abstracts that include sample collection, storage, preservation, preparation, extraction, and analysis information. EMMI also contains information on contact points within offices and organizations responsible for publishing the analytical methods or regulatory information contained in EMMI. EMMI Version 2.0 has more than tripled its size from Version 1.0. It currently contains information on more than 3,400 abstracts of analytical methods to include all EPA, NIOSH, and DOE methods and many from state government and universities. This update will also include the SW-846 Proposed Update III. The database contains more than 4,000 substances from 47 regulatory and non- regulatory lists. This includes substances from SARA, CERCLA, SDWA, CAA, and CWA, as well as substances from other agency lists. Comprehensive cross-reference databases are provided for more than 18,500 substances.One new feature provides method-matrix grouping to enable users to quickly find methods according to type of matrix, e.g. air, water, etc. Users can search for information in any one of the following categories: chemical names, trade names, or synonyms; CAS registry number; apparatus; analytical method number; regulatory origin; custodial organization; short or full title of the method; and matrix.EMMI is currently used throughout all levels of EPA and has a growing user community in the private sector, including laboratory managers and staff, environmental professionals, and legal counsels.