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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

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  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 368 236

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

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

    C 372 245

Repositories

Showing 10 of 699 repositories
  • 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 40 Updated Oct 15, 2026
  • Lepak_Hg_Models Public

    NLA sediment Hg analysis for Lepak et al.

    USEPA/Lepak_Hg_Models's past year of commit activity
    R 1 MIT 0 0 0 Updated Oct 15, 2026
  • OzoneWatch Public
    USEPA/OzoneWatch's past year of commit activity
    R 1 2 0 0 Updated Oct 15, 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.

    R 76 CC0-1.0 29 151 (5 issues need help) 6 Updated Oct 15, 2026
  • airnow10 Public

    Core ddev container fro airnow in drupal 10

    USEPA/airnow10's past year of commit activity
    Shell 0 0 0 1 Updated Oct 15, 2026
  • 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 24 CC0-1.0 10 19 0 Updated Oct 15, 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 Oct 15, 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 15, 2026
  • govchat Public Forked from Patrick-Davis-MSFT/chatbot-ui

    Customized GenAI chatbot interface for EPA employees

    USEPA/govchat's past year of commit activity
    TypeScript 6 MIT 9,617 0 0 Updated Oct 15, 2026
  • ccte-api-exposure Public

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

    USEPA/ccte-api-exposure's past year of commit activity
    Java 1 MIT 1 5 (1 issue needs help) 1 Updated Oct 15, 2026