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@USEPA

U.S. Environmental Protection Agency

Protecting Human Health and the Environment

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The US Environmental Protection Agency's mission is to protect human health and the environment. We develop models, tool, data sets, libraries, and applications to help serve our mission.

As part of the government's open source initiative, we publish software here and are open to recieving contributions depending on the project. Please see each repository's CONTRIBUTING.md file for how you can help.

Check out EPA's public open job postings usajobs.gov.

Here are some interesting topics to explore:

  • ord -- EPA's office of research and development develops models and tools to study environmental issues
  • ow -- EPA's office of water studies and regulates the US's waterways
  • oar -- EPA's Office of Air and Radiation studies and regulates air pollution and emissions

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  1. WNTR WNTR Public

    An EPANET compatible python package to simulate and analyze water distribution networks under disaster scenarios.

    Python 378 208

  2. CMAQ CMAQ Public

    Code for U.S. EPA’s Community Multiscale Air Quality Model (CMAQ) for estimating ozone, particulates, toxices, and deposition of acids and nutrients at neighborhood to global scales.

    Fortran 324 221

  3. Stormwater-Management-Model Stormwater-Management-Model Public

    Dynamic hydrology-hydraulic water quality simulation model for stormwater, wastewater, and combined sewer collection systems

    C 295 199

Repositories

Showing 10 of 635 repositories
  • provisional_habs Public

    Repository holding data from Harmful Algal Bloom (HAB) monitoring conducted by United States Environmental Protection Agency, Office of Research and Development, Center for Environmental Measurement and Modelling, Atlantic Coastal Environmental Sciences Division researchers

    USEPA/provisional_habs’s past year of commit activity
    2 CC0-1.0 2 0 0 Updated Sep 1, 2025
  • code-json-generator Public Forked from emartinez-usgs/code-json-generator

    Automation that scrapes USEPA github and provides that metadata for code.gov

    USEPA/code-json-generator’s past year of commit activity
    JavaScript 0 MIT 10 0 0 Updated Sep 1, 2025
  • gflow1 Public
    USEPA/gflow1’s past year of commit activity
    Fortran 3 MIT 5 5 2 Updated Sep 1, 2025
  • webcms Public

    Content management system for EPA's flagship website, www.epa.gov

    USEPA/webcms’s past year of commit activity
    JavaScript 11 9 0 28 Updated Sep 1, 2025
  • USEPA/campdRShinyDataSource’s past year of commit activity
    R 3 MIT 2 0 0 Updated Aug 30, 2025
  • CompTox-ExpoCast-httk Public

    The R package "httk" provides free, open-source data and models for toxicokinetics. The models are designed to use chemical-specific in vitro (animal free) measurements. The predictions can be used for traditional dosimetry as well as in vivo-in vitro extrapolation (IVIVE). This repository is for reporting bugs and contributing enhancements.

    USEPA/CompTox-ExpoCast-httk’s past year of commit activity
    R 30 18 5 0 Updated Aug 29, 2025
  • WNTR Public

    An EPANET compatible python package to simulate and analyze water distribution networks under disaster scenarios.

    USEPA/WNTR’s past year of commit activity
    Python 378 208 36 1 Updated Aug 29, 2025
  • USEPA/power-sector-dev-portal’s past year of commit activity
    JavaScript 1 MIT 1 1 0 Updated Aug 29, 2025
  • EPATADA Public

    This R package can be used to compile and evaluate Water Quality Portal (WQP) data for samples collected from surface water monitoring sites on streams and lakes. It can be used to create applications that support water quality programs and help states, tribes, and other stakeholders efficiently analyze the data.

    USEPA/EPATADA’s past year of commit activity
    R 55 CC0-1.0 23 79 (7 issues need help) 3 Updated Aug 29, 2025
  • IntraCMS Public

    US EPA Intranet CMS

    USEPA/IntraCMS’s past year of commit activity
    CSS 6 MIT 3 0 0 Updated Aug 29, 2025

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