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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:

  • research -- EPA 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

Pinned Loading

  1. WNTR WNTR Public

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

    Python 469 240

  2. CMAQ CMAQ Public

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

    Fortran 370 236

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

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

    C 374 247

Repositories

Showing 10 of 698 repositories
  • 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 76 CC0-1.0 29 152 (5 issues need help) 5 Updated Oct 21, 2026
  • webcms Public

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

    USEPA/webcms's past year of commit activity
    JavaScript 13 MIT 8 0 39 Updated Oct 21, 2026
  • 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
    3 CC0-1.0 2 0 0 Updated Oct 21, 2026
  • StreamCatTools Public

    R package to work with the StreamCat API within R and access the full suite of StreamCat catchment and watershed scale metrics for all NHDPlusV2 stream reaches and catchments.

    USEPA/StreamCatTools's past year of commit activity
    HTML 41 15 12 0 Updated Oct 21, 2026
  • IntraCMS Public

    US EPA Intranet CMS

    USEPA/IntraCMS's past year of commit activity
    CSS 8 MIT 3 0 1 Updated Oct 21, 2026
  • fallsLakeCH4 Public
    USEPA/fallsLakeCH4's past year of commit activity
    R 0 2 1 0 Updated Oct 21, 2026
  • 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 2 MIT 10 0 0 Updated Oct 21, 2026
  • USEPA/Water-Infrastructure-and-Capacity-Assessment-Tool's past year of commit activity
    R 1 MIT 0 0 0 Updated Oct 20, 2026
  • EnviroAtlas_DB Public

    Repo for storing Enviroatlas DB

    USEPA/EnviroAtlas_DB's past year of commit activity
    JavaScript 1 0 0 1 Updated Oct 20, 2026
  • ccte-api-chemical Public

    US EPA's CTX Chemical API, available at: https://comptox.epa.gov/ctx-api/docs/chemical.html

    USEPA/ccte-api-chemical's past year of commit activity
    Java 7 MIT 3 27 (1 issue needs help) 2 Updated Oct 20, 2026