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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 414 221

  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 349 225

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

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

    C 320 213

Repositories

Showing 10 of 673 repositories
  • TADAShiny Public

    TADAShiny is a R Shiny application (link to web version below) built on top of the TADA R Package (https://github.com/USEPA/TADA). It provides a user friendly, web accessible interface.

    USEPA/TADAShiny’s past year of commit activity
    R 20 CC0-1.0 8 25 1 Updated Mar 1, 2026
  • USEPA/TADAShinyAnalyze’s past year of commit activity
    R 0 CC0-1.0 0 6 1 Updated Mar 1, 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 Mar 1, 2026
  • TADACommunityHub Public

    A collaborative hub where TADA users share and maintain information for custom workflows (e.g., state, tribal, territory, EPA, or other entities). For example, it includes user-contributed criteria and methodologies templates to support reproducible and efficient analyses.

    USEPA/TADACommunityHub’s past year of commit activity
    R 1 CC0-1.0 0 2 3 Updated Feb 28, 2026
  • 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 69 CC0-1.0 26 121 (7 issues need help) 4 Updated Feb 28, 2026
  • webcms Public

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

    USEPA/webcms’s past year of commit activity
    JavaScript 13 8 0 37 Updated Feb 28, 2026
  • NEP-Water-Quality Public Forked from amandovi/NEP-OA-WQ

    Code used for filtering, QAing, and visualizing monitoring data from NEP sites for ocean acidification and water quality analysis

    USEPA/NEP-Water-Quality’s past year of commit activity
    R 2 3 0 0 Updated Feb 28, 2026
  • pf_python_modelbuilding Public

    Python based code to create qsar models for WebTEST2.0 platform

    USEPA/pf_python_modelbuilding’s past year of commit activity
    Python 2 2 0 0 Updated Feb 28, 2026
  • Water_Treatment_Models Public

    Predicting water treatment unit operation effectiveness

    USEPA/Water_Treatment_Models’s past year of commit activity
    Python 38 MIT 33 1 0 Updated Feb 27, 2026
  • USEPA/ccte-container-scan’s past year of commit activity
    0 0 0 0 Updated Feb 27, 2026