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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 421 224

  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 351 226

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

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

    C 324 219

Repositories

Showing 10 of 677 repositories
  • ExpertQueryTMDLDashboard Public

    The ExpertQueryTMDLDashboard is an R Shiny application designed to summarize and count TMDLS based on user inputs to filters on various fields including state, region, pollutant, year, and addressed parameter. TMDL data from ATTAINS are downloaded via Expert Query web services and are refreshed weekly.

    USEPA/ExpertQueryTMDLDashboard’s past year of commit activity
    HTML 0 CC0-1.0 0 0 0 Updated Mar 29, 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 Mar 29, 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 69 CC0-1.0 26 129 (7 issues need help) 4 Updated Mar 29, 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 Mar 27, 2026
  • webcms Public

    Content management system for EPA's flagship website, www.epa.gov

    USEPA/webcms’s past year of commit activity
    JavaScript 13 8 0 42 Updated Mar 27, 2026
  • ORD_SAB_Model Public

    Repository for the ORD developed model for water system service area boundaries.

    USEPA/ORD_SAB_Model’s past year of commit activity
    HTML 26 MIT 7 0 0 Updated Mar 27, 2026
  • TEVA-SPOT-GUI Public archive

    DEPRECATED - This is a repository for the distribution of the TEVA-SPOT-GUI software

    USEPA/TEVA-SPOT-GUI’s past year of commit activity
    R 6 6 0 0 Updated Mar 27, 2026
  • CANARY Public archive

    DEPRECATED - Tool for finding events in water quality metrics

    USEPA/CANARY’s past year of commit activity
    Java 8 LGPL-2.1 5 0 0 Updated Mar 27, 2026
  • TEVA-SPOT-Toolkit Public archive

    DEPRECATED - Drinking water distribution modeling tool to simulate contamination incidents and optimize the placement of water quality sensors.

    USEPA/TEVA-SPOT-Toolkit’s past year of commit activity
    Mathematical Programming System 4 7 0 0 Updated Mar 27, 2026
  • Water-Security-Toolkit Public archive

    DEPRECATED - Support the design of contamination warning systems and response action plans

    USEPA/Water-Security-Toolkit’s past year of commit activity
    C++ 6 5 0 0 Updated Mar 27, 2026