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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 461 239

  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 363 233

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

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

    C 357 235

Repositories

Showing 10 of 695 repositories
  • EPA-Metadata-Editor-Pro Public

    EME for ArcGIS Pro assists GIS professionals in creating, editing, and validating metadata that complies with EPA’s Metadata Technical Specification.

    USEPA/EPA-Metadata-Editor-Pro's past year of commit activity
    XSLT 12 MIT 2 22 0 Updated Sep 10, 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 28 152 (5 issues need help) 9 Updated Sep 10, 2026
  • CRACMM Public

    The Community Regional Atmospheric Chemistry Multiphase Mechanism (CRACMM) is a description of atmospheric NOx-VOC-ozone-aerosol chemistry and associated metadata.

    USEPA/CRACMM's past year of commit activity
    MATLAB 9 11 1 0 Updated Sep 10, 2026
  • BMDS-UI Public

    U.S. EPA Benchmark Dose Modeling Software User Interface (BMDS Desktop and BMDS Online)

    USEPA/BMDS-UI's past year of commit activity
    CSS 5 MIT 5 0 0 Updated Sep 10, 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 10, 2026
  • EnviroAtlas_DB Public

    Repo for storing Enviroatlas DB

    USEPA/EnviroAtlas_DB's past year of commit activity
    JavaScript 1 0 0 1 Updated Sep 10, 2026
  • spmodel Public

    spmodel: Spatial Statistical Modeling and Prediction in R

    R 26 GPL-3.0 5 0 0 Updated Sep 10, 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) 1 Updated Sep 10, 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 10, 2026
  • basin-bmp-scenario-sim Public

    Probabilistic simulation of basin-scale best management / conservation practice implementation scenarios depicting aggregate costs and impacts on basin-outlet pollutant loads

    USEPA/basin-bmp-scenario-sim's past year of commit activity
    Python 2 MIT 2 2 1 Updated Sep 10, 2026