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    • Data Repository for StreamCatNNI and LakeCatNNI: Watershed and Local Catchment Nitrogen and Phosphorus Budgets for U.S. Streams and Lakes

    Metadata Updated: April 4, 2026

    Spatially explicit nutrient budgets are critical for managing nutrients and improving water quality. Yet, these budgets are resource-intensive to develop at the scales and extents needed for achieving management goals. In this paper we introduce StreamCatNNI and LakeCatNNI, an integration of the United States Environmental Protection Agency's (USEPA) Next Generation National Nutrient Inventory (NNI) with the StreamCat database. The NNI provides 30-year annual time-series (1987-2017) of nitrogen (N) and phosphorus (P) budgets for US counties. The NNI¿s integration with StreamCat yields watershed and local catchment N and P budgets for ~2.64 million stream segments and 378,088 lakes. These budgets contain major anthropogenic and natural inputs, outputs, agricultural surplus, and legacy agricultural surplus for N and P. StreamCatNNI and LakeCatNNI data were calculated using 1) a tabular dasymetric apportionment process to downscale NNI nutrient data to local drainages, then 2) the StreamCat accumulation framework to derive watershed nutrient budgets. StreamCatNNI and LakeCatNNI data underwent a variety of spatial quality assurance evaluations, and workflow components are publicly available for replication.

    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 April 4, 2026
    Metadata Updated Date April 4, 2026

    Metadata Source

    Harvested from EPA ScienceHub

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date April 4, 2026
    Metadata Updated Date April 4, 2026
    Publisher U.S. Environmental Protection Agency
    Maintainer
    Identifier https://doi.org/10.23719/d-pmvp
    Data Last Modified 2026-02-06
    Public Access Level public
    Bureau Code 020:00
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Data Dictionary https://pasteur.epa.gov/uploads/10.23719/d-pmvp/documents/StreamCat_LakeCat_Nutrient_Inventory_Data_Dictionary.xlsx
    Data Dictionary Type application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
    Harvest Object Id 391a303b-0fd3-4d8e-a5ff-43c9fadedde3
    Harvest Source Id 04b59eaf-ae53-4066-93db-80f2ed0df446
    Harvest Source Title EPA ScienceHub
    License https://pasteur.epa.gov/license/sciencehub-license.html
    Old Spatial -126.0834,24.6243,-65.1573,49.6737
    Program Code 020:000
    Publisher Hierarchy U.S. Government > U.S. Environmental Protection Agency
    Source Datajson Identifier True
    Source Hash 7b5431a698202586aec6c6be96c77136041708087ac790d4b2e460aac5fefb25
    Source Schema Version 1.1
    Spatial {"type": "Polygon", "coordinates": -126.0834, 24.6243, -126.0834, 49.6737, -65.1573, 49.6737, -65.1573, 24.6243, -126.0834, 24.6243}

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