| 3DFEMWATER/ 3DLEWASTE - Three-Dimensional Finite Element Model of Water Flow/ Three-Dimensional Lagrangian-Eulerian Finite Element Model of Waste Transport | USEPA |
| Acts/ Risk - Analytical Contaminant Transport Analysis System/ Health Risk Analysis Software | M. M. Aral et al., Georgia Institute of Technology, GA |
| AERMOD - AMS/EPA Regulatory Model | USEPA |
| AGDISP - AGricultural DISPersal | USDA Forest Service |
| AgDRIFT | USEPA, USDA Forest Service and Spray Drift Task Force |
| AGWA - Automated Geospatial Watershed Assessment | USEPA, USDA and University of Arizona |
| ALOHA - Areal Locations of Hazardous Atmospheres | NOAA |
| ALOHA (Areal Locations of Hazardous Atmospheres) ArcMap Import Tools | US NOAA Office of Response and Restoration |
| AQTESOLV - AQuifer TEst SOLVer | HydroSOLVE, Inc. |
| AQUATOX ("simulation model for aquatic systems") | USEPA and R. Park, Ecomodeling |
| AquiferWin32 | ESI Ltd. |
| ASPEN - Assessment System for Population Exposure Nationwide | USEPA |
| BASINS - Better Assessment Science Integrating point & Non-point Sources | USEPA |
| CALPro (CALPUFF, CALMET) | Atmospheric Studies Group at TRC |
| CalTOX | California DTSC |
| CAMx - Comprehensive Air Quality Model with Extensions | Environ |
| CE-QUAL-W2 | U.S. Army Corps of Engineers and Portland State University |
| ChemStat ("statistical analysis of ground water monitoring data at RCRA facilities") | Starpoint Software Inc. |
| CMAQ - Community Multi-scale Air Quality modeling system | CMAS Center, UNC-Chapel Hill |
| COMMUTER | USEPA |
| DFLOW | USEPA |
| DMR Pollutant Loading Tool - Discharge Monitoring Report Pollutant Loading Tool | USEPA |
| EFDC - Environmental Fluid Dynamics Code | Virginia Institute of Marine Science, The College of William and Mary (J. M. Hamrick) and USEPA |
| EMSOFT - Exposure Model for Soil-Organic Fate and Transport | RTP |
| EnvStats - Package for Environmental Statistics, including US EPA Guidance | S.P. Millard |
| EPANET ("Models the Hydraulic and Water Quality Behavior of Water Distribution Piping Systems") | USEPA |
| EPI - Estimation Program Interface Suite - suite of physical/chemical property and environmental fate estimation programs | USEPA |
| EQuIS ("Environmental data management") | EarthSoft Inc. |
| EXAMS - Exposure Analysis Modeling System | USEPA |
| FACT - Flow And Contaminant Transport | Savannah River Technology Center and US DOE |
| FIRST - FQPA Index Reservoir Screening Tool | USEPA |
| FOCUS - FOrum for Co-ordination of pesticide fate models and their USe | FOCUS team, EU Commission |
| FRAMES-3MRA - Multimedia, Multi-pathway, Multi-receptor Exposure and Risk Assessment | USEPA |
| GARR - Gross Alpha Radium Regulation | USEPA |
| GasSim ("simulates the fate of landfill gas arising from managed or unmanaged landfill sites") | Golder Associates and Environment Agency of England and Wales |
| GBPCALC - Gross Beta Photon Calculator | USEPA |
| GENEEC2 - Generic Estimated Environmental Concentration | USEPA |
| GMS - Groundwater Modeling System | Aquaveo |
| Groundwater Vistas ("3D groundwater flow and contaminant transport modeling, calibration and optimization using the MODFLOW suite of codes") | Groundwater Vistas development team |
| HPAC - Hazard Prediction and Assessment Capability | DTRA - Defense Threat Reduction Agency |
| HSPF - Hydrological Simulation Program - FORTRAN | USEPA |
| HYPACT - Hybrid Particle And Concentration Transport Model | ATMET |
| HYSPLIT - Hybrid Single Particle Lagrangian Integrated Trajectory Model | NOAA Air Resources Laboratory |
| IAQX - Simulation Tool Kit for Indoor Air Quality and Inhalation Exposure | USEPA |
| IGSM - Integrated Global System Model | MIT Joint Program on the Science and Policy of Global Change and USEPA |
| IsoConc | USEPA |
| IsoSource | USEPA |
| i-SVOC ("application for dynamic modeling of the emissions, transport, sorption, and distribution of semi-volatile organic compounds (SVOCs) in the indoor environment") | USEPA |
| KABAM - Kow (based) Aquatic BioAccumulation Model | USEPA |
| LSPC - Loading Simulation Program in C++ | USEPA |
| MAGICC/SCENGEN - Model for the Assessment of Greenhouse Gas Induced Climate Change/Scenario Generator | National Center for Atmospheric Research |
| MEASURE - Mobile Emissions Assessment System for Urban and Regional Evaluation | Georgia Institute of Technology and USEPA |
| MENTOR-1A - Modeling ENvironment for TOtal Risk studies in a One Atmosphere setting | Computational Chemodynamics Laboratory |
| MENTOR-4M - Modeling ENvironment for TOtal Risk studies for Multiple co-occurring contaminants and Multimedia, Multipathway, Multiroute exposures | Computational Chemodynamics Laboratory |
| MEPAS - Multimedia Environmental Pollutant Assessment System | Pacific Northwest National Laboratory |
| MESOPUFF - Mesoscale Puff Model | USEPA |
| MINTEQA2 | USEPA and Jerry Allison, Computer Sciences Corp. |
| MM5 or PSU/NCAR mesoscale model | Pennsylvania State University National Center for Atmospheric Research |
| Models-3 Technical Support Forum | CMAS Center |
| Modflow | US Geological Survey |
| MT3DMS - Modular 3-D Multi-Species Transport model (previously MT3D) | S.S. Papadopulos & Associates, Inc. and USEPA |
| NWPCAM - Nation Water Pollution Control Assessment Model | USEPA |
| P2P - Pollution Prevention Progress (see TRACI) | USEPA |
| PCRAMMET | USEPA |
| PEARL - Pesticide Emission Assessment at Regional and Local scales, GeoPEARL | Alterra, PBL and RIVM |
| PFAM - Pesticides in Flooded Application Model | USEPA |
| PRZM - Pesticide Root Zone Model | USEPA |
| PRZM/EXAMS Shell | USEPA |
| PRZM-GW | USEPA |
| QUAL2E (Enhanced Stream Water Quality model) | Tufts University and USEPA |
| QUAL2K - River and Stream Water Quality Model | USEPA |
| QUIC - Quick Urban & Industrial Complex | Los Alamos National Laboratory |
| RAMS - Regional Atmospheric Modeling System | ATMET, LLC |
| REMSAD - Regional Modeling System for Aerosols and Deposition | ICF Consulting |
| RESRAD - RESidual RADioactive | Argonne National Laboratory |
| RPM-AERO (Modelling platform for studying photochemical gaseous and aerosol phase processes) | Computational Chemodynamics Laboratory |
| R-UNSAT | USGS |
| SCIPUFF - Second-order Closure Integrated PUFF Model | Titan Products |
| SIP - Screening Imbibition Program ("model to estimate chemical exposure from drinking water alone in birds and mammals") | USEPA |
| SMS - Surface Water Modeling System | Coastal and Hydraulics Laboratory |
| SWCC - Surface Water Concentration Calculator | USEPA |
| TerrPLANT | USEPA |
| Tier 1 Rice Model ("estimate surface water exposure from the use of pesticides in rice paddies") | USEPA |
| TOXSWA - TOXic substances in Surface WAters | TOXSWA team |
| TRACI - Tool for the Reduction and Assessment of Chemical and other Environmental Impacts (previously, P2P) | USEPA |
| UAM-V - Urban Airshed Model-V | ICF International and USEPA |
| Unmix | USEPA |
| USEtox - UNEP-SETAC (Life Cycle Initiative) Tox | USEtox development team |
| VLEACH | Dynamac Corporation and USEPA |
| WASP - Water Quality Analysis Simulation Program | USEPA |
| WATERSHEDSS - WATER, Soil, and Hydro- Environmental Decision Support System | North Carolina State University and USEPA |
| WhAEM2000 | USEPA |
| WMS - Watershed Modeling System | Aquaveo |
| WRF - The Weather Research & Forecasting Model | WRF Consortium |
| WRF User's Forum | WRF User's Forum Team |
| WRF-Chem - WRF weather prediction coupled with chemistry | WRF-Chem development team |
