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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 369 236

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

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

    C 372 246

Repositories

Showing 10 of 698 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
    3 CC0-1.0 2 0 0 Updated Oct 18, 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 41 Updated Oct 18, 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 18, 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 76 CC0-1.0 29 151 (5 issues need help) 6 Updated Oct 18, 2026
  • spmodel Public

    spmodel: Spatial Statistical Modeling and Prediction in R

    USEPA/spmodel's past year of commit activity
    R 27 GPL-3.0 5 0 0 Updated Oct 17, 2026
  • spsurvey Public

    spsurvey: Spatial Sampling Design and Analysis in R

    USEPA/spsurvey's past year of commit activity
    R 22 GPL-3.0 9 0 0 Updated Oct 17, 2026
  • SSN2 Public

    SSN2: Spatial Modeling on Stream Networks in R

    USEPA/SSN2's past year of commit activity
    R 26 GPL-3.0 8 0 0 Updated Oct 16, 2026
  • CGEM Public
    USEPA/CGEM's past year of commit activity
    Fortran 2 MIT 2 4 0 Updated Oct 16, 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 Oct 16, 2026
  • IntraCMS Public

    US EPA Intranet CMS

    USEPA/IntraCMS's past year of commit activity
    CSS 8 MIT 3 0 1 Updated Oct 16, 2026