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    • Office of Water Linked Data

    Metadata Updated: February 10, 2026

    The Office of Water Linked Data (OWLD) dataset stores EPA Water program information indexed to several National Hydrography Dataset frameworks. Indexing may be accomplished by catchment, reach or hydrologic unit referencing and includes a curated set of relevant program data attributes. OWLD is closely related to the NHD Event Data model with extensions added to cover catchment-based indexing.

    Access & Use Information

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

    Downloads & Resources

    Dates

    Metadata Created Date February 10, 2026
    Metadata Updated Date February 10, 2026

    Metadata Source

    Harvested from EPA Non Geo Repository

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date February 10, 2026
    Metadata Updated Date February 10, 2026
    Publisher U.S. EPA Office of Water (OW)
    Maintainer
    Identifier d4ae8812-b921-40ee-96b5-ba9829b96568
    Data Last Modified 2024-05-14
    Public Access Level public
    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
    Data Quality True
    Harvest Object Id 719205bd-c2aa-40ba-84e2-ae9ca0c0a9ba
    Harvest Source Id 9c1c2b5b-7925-4ca2-a663-ca2131653db1
    Harvest Source Title EPA Non Geo Repository
    Homepage URL https://www.epa.gov/waterdata/waters-watershed-assessment-tracking-environmental-results-system/
    License https://edg.epa.gov/EPA_Data_License.html
    Primary IT Investment UII 020-000000087
    Program Code 020:112
    Source Datajson Identifier True
    Source Hash 048bf2fd93a24c6274b6704d50d7eac65a8ecee6fe7be273e4f9f3ee05cfe562
    Source Schema Version 1.1
    Temporal 2000-01-01/2024-05-14

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