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    • Contaminant Candidate List 1

    Metadata Updated: February 10, 2026

    CCL 1 is a list of contaminants that are currently not subject to any proposed or promulgated national primary drinking water regulations, that are known or anticipated to occur in public water systems, and which may require regulation under the Safe Drinking Water Act (SDWA). The list includes, among others, pesticides, disinfection byproducts, chemicals used in commerce, waterborne pathogens, pharmaceuticals, and biological toxins. The Agency considered the best available data and information on health effects and occurrence to evaluate thousands of unregulated contaminants.

    Access & Use Information

    Public: This dataset is intended for public access and use. License: See this page for license information.

    Downloads & Resources

    No file downloads have been provided. The publisher may provide downloads in the future or they may be available from their other links.

    References

    https://edg.epa.gov/metadata/rest/document?id=%7BC74548B9-0661-4B3D-8980-BF0E9C72C81F%7D
    https://edg.epa.gov/metadata/catalog/search/resource/details.page?uuid=%7BC74548B9-0661-4B3D-8980-BF0E9C72C81F%7D

    Dates

    Metadata Created Date January 30, 2026
    Metadata Updated Date February 10, 2026
    Data Update Frequency irregular

    Metadata Source

    Harvested from EPA Non Geo Repository

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date January 30, 2026
    Metadata Updated Date February 10, 2026
    Publisher U.S. EPA Office of Water (OW) - Office of Ground Water and Drinking Water (OGWDW)
    Maintainer
    Identifier {C74548B9-0661-4B3D-8980-BF0E9C72C81F}
    Data First Published 2014-01-01
    Data Last Modified 1998-03-02
    Public Access Level public
    Data Update Frequency irregular
    Bureau Code 020:00
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Metadata Catalog ID https://edg.epa.gov/data/nongeo_data.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Harvest Object Id 9c694bf4-d04e-4772-8757-17205d0d5772
    Harvest Source Id 9c1c2b5b-7925-4ca2-a663-ca2131653db1
    Harvest Source Title EPA Non Geo Repository
    License https://edg.epa.gov/EPA_Data_License.html
    Old Spatial -180.0,18.0,-66.0,72.0
    Program Code 020:072
    Related Documents https://edg.epa.gov/metadata/rest/document?id=%7BC74548B9-0661-4B3D-8980-BF0E9C72C81F%7D, https://edg.epa.gov/metadata/catalog/search/resource/details.page?uuid=%7BC74548B9-0661-4B3D-8980-BF0E9C72C81F%7D
    Source Datajson Identifier True
    Source Hash bd56ac57936fc64057d2c866b65a8019cb5bfd4a133a8e77a5da259479a3ec6d
    Source Schema Version 1.1
    Spatial {"type": "Polygon", "coordinates": -180.0, 18.0, -180.0, 72.0, -66.0, 72.0, -66.0, 18.0, -180.0, 18.0}

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