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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 463 239

  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 366 233

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

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

    C 365 240

Repositories

Showing 10 of 697 repositories
  • IntraCMS Public

    US EPA Intranet CMS

    USEPA/IntraCMS's past year of commit activity
    CSS 8 MIT 3 0 1 Updated Sep 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 MIT 8 0 34 Updated Sep 28, 2026
  • RAQSAPI Public

    A R extension to retrieve EPA Air Quality System Data via the AQS Data Mart API

    USEPA/RAQSAPI's past year of commit activity
    R 26 9 2 0 Updated Sep 28, 2026
  • EnviroAtlas_v4 Public

    EnviroAtlas migration to JS4. Easy to use, interactive mapping application to access maps showing environmental data

    USEPA/EnviroAtlas_v4's past year of commit activity
    Svelte 6 MIT 1 0 0 Updated Sep 28, 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 MIT 15 12 0 Updated Sep 28, 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 Sep 28, 2026
  • EnviroAtlas_DB Public

    Repo for storing Enviroatlas DB

    USEPA/EnviroAtlas_DB's past year of commit activity
    JavaScript 1 0 0 0 Updated Sep 28, 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 Sep 28, 2026
  • pyTRIM_EPA Public
    USEPA/pyTRIM_EPA's past year of commit activity
    Python 2 0 0 0 Updated Sep 28, 2026
  • pyaqsapi Public

    A python 3 package to retrieve ambient air monitoring data from the United States Environmental Protection Agency’s (US EPA) Air Quality System (AQS) Data Mart API v2 interface

    Python 29 MIT 10 3 1 Updated Sep 28, 2026