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U.S. Environmental Protection Agency

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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. An EPANET compatible python package to simulate and analyze water distribution networks under disaster scenarios.

    Python 426 225

  2. 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 353 226

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

    C 330 224

Repositories

Showing 10 of 680 repositories

  • USEPA/code-json-generator’s past year of commit activity

    JavaScript

    2

    MIT

    10 0 0

    Updated Apr 17, 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

  • USEPA/ccte-api-hazard’s past year of commit activity

    Java

    1

    MIT

    1 2 1

    Updated Apr 16, 2026

  • USEPA/pf_python_modelbuilding’s past year of commit activity

    Python

    2 2 0 0

    Updated Apr 16, 2026

  • rExpertQuery Public

    An R package designed for retrieving ATTAINS data efficiently via Expert Query web services.

    USEPA/rExpertQuery’s past year of commit activity

    HTML

    8

    CC0-1.0

    5 5 1

    Updated Apr 16, 2026

  • USEPA/webcms’s past year of commit activity

    JavaScript

    13 8 0 42

    Updated Apr 16, 2026

  • emf Public

    Emissions Modeling Framework (EMF)

    USEPA/emf’s past year of commit activity

    Java

    7

    MIT

    5 58 0

    Updated Apr 16, 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

    4

    MIT

    4 0 0

    Updated Apr 16, 2026

  • surge_morpho Public

    Repository for working with lake morphometry and bathy datasets

    USEPA/surge_morpho’s past year of commit activity

    Rich Text Format 0 0

    0 0

    Updated Apr 16, 2026

  • USEPA/ccte-api-exposure’s past year of commit activity