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    • Drinking Water Maximum Contaminant Levels (MCLs)

    Metadata Updated: February 10, 2026

    National Primary Drinking Water Regulations (NPDWRs or primary standards) are legally enforceable standards that apply to public water systems. Primary standards protect public health by limiting the levels of contaminants in drinking water.

    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/catalog/search/resource/details.page?uuid=%7B801C993D-B195-4B7A-97B6-17B299ED1E95%7D
    https://edg.epa.gov/metadata/rest/document?id=%7B801C993D-B195-4B7A-97B6-17B299ED1E95%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 {801C993D-B195-4B7A-97B6-17B299ED1E95}
    Data First Published 2014-01-01
    Data Last Modified 2009-05-01
    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 760902dc-7a20-447a-834a-4a2d01ef40c5
    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/catalog/search/resource/details.page?uuid=%7B801C993D-B195-4B7A-97B6-17B299ED1E95%7D, https://edg.epa.gov/metadata/rest/document?id=%7B801C993D-B195-4B7A-97B6-17B299ED1E95%7D
    Source Datajson Identifier True
    Source Hash 4c920e89683b6f68053dbc6eb9cb8b7648ff8ec125c7a7508f63f11beae72801
    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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