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In addition to the education and outreach materials available on this site (see the Integrated Environmental Modeling, Model Evaluation, Regional Webinars and Workshops, and Related Links pages), many other sites contain important modeling guidance and tools. A set of links is provided below to encourage education and communication within the modeling community regarding scientific defensibility in modeling, best modeling practices, integrated environmental modeling, and other topics. As with its collection of guidance and other documents, the CREM continually works with partners within and outside the Agency to assess education and outreach needs and to update this list of websites.

Environmental Modeling Related Inventories and Clearinghouses
Other Links:

Environmental Modeling Related Inventories and Clearinghouses

CREM: EPA's Council for Regulatory Environmental Modeling (CREM) was established in 2000 to promote consistency and consensus among environmental model developers and users. The Models Knowledge Base is home to 147 models that are used, supported, or funded by the EPA.

CEAM: The EPA Center for Exposure Assessment Modeling (CEAM) was established in 1987 to meet the scientific and technical exposure assessment needs of the United States Environmental Protection Agency (U.S. EPA) as well as state environmental and resource management agencies. CEAM provides proven predictive exposure assessment techniques for aquatic, terrestrial, and multimedia pathways for organic chemicals and metals. CEAM's models are categorized into: Groundwater Models; Surface Water Models; Food Chain Models; and Multimedia Models.

CSMoS: The Center for Subsurface Modeling Support (CSMoS) provides public domain ground-water and vadose zone modeling software and services to public agencies and private companies throughout the nation. The primary aims of CSMoS are to provide direct technical support to EPA and State decision makers in subsurface model applications; and manage and support the ground-water models and databases resulting from the research at NRMRL

EMCH: The Emissions Model Clearinghouse (EMCH) is designed to support and promote emission modeling activities both internal and external to EPA. The EPA intends to distribute emissions model input formatted inventories based on the latest versions of its National Emission Inventory databases. In addition to the emissions data, this site will be used to document and distribute the Agency's latest versions of the ancillary files used to support the temporal, spatial, speciation, and projection of these emissions.

MCHISRS: The Model Clearinghouse Information Storage and Retrieval System (MCHISRS) is an electronic data base system designed to help the Model Clearinghouse manage information about referrals from the EPA Regional Offices involving the interpretation of modeling guidance for specific regulatory applications. The Model Clearinghouse resides in AQMG, and is the single EPA focal point for reviewing the use of modeling techniques for specific regulatory applications. The Clearinghouse also serves to compile and report Agency decisions concerning deviations from the requirements of the Guideline on Air Quality Models.

SCRAM: The Support Center for Regulatory Atmospheric Modeling (SCRAM) is maintained by EPA's Air Quality Modeling Group (AQMG). The AQMG conducts modeling analyses to support policy and regulatory decisions in the Office of Air and Radiation (OAR) and provides leadership and direction on the full range of air quality models and other mathematical simulation techniques used in assessing control strategies and source impacts. Documentation and guidance for these air quality models can be found on this website, including downloadable computer code, input data, and model processors.

WWQTSC: The mission of the Watershed and Water Quality Modeling Technical Support Center is to provide assistance to EPA Regions, State and Local Governments, and their contractors in the implementation of the Clean Water Act. The Center which is part of EPA's Office of Research and Development (ORD) is committed to providing access to technically defensible tools and approaches that can be used in the development of Total Maximum Daily Loads (TMDL), waste load allocations, and watershed protection plans.

SuperMUSE: Ecosystems Research Division's Supercomputer for Model Uncertainty and Sensitivity Evaluation (SuperMUSE) is a key to enhancing quality assurance in environmental models and applications.

Model Evaluation: Modeling frameworks are important software tools that can be leveraged to conduct integrated environmental modeling, as in support of multimedia ecological exposure research. For such research to be relevant to policy, rigorous and quantitative model evaluation is necessary. This page provides links to non-EPA web sites that provide additional information about models.

Type Database Webpage Listings Database Webpage Listings Webpage Listings Webpage Listings Database Tool Catalogue
ContentsA Models Tools

Models Tools


Models Information --- Tools
User SupportB No Yes Yes No No Yes --- --- No
Scope Models developed, used or supported by EPA Exposure Assessment Ground Water

Vadose Zone
Emissions Air Quality Watershed

Water Quality
Air Quality Uncertainty Analysis

Sensitivity Analysis
Uncertainty Analysis

Sensitivity Analysis
Number of Listings 147 Models 24 Models

3 Tools
22 Models 7 Models

1 tool
39 Models

1 Tool
11 Models --- --- 64
Searchable Yes No Yes No No No Yes --- No
Input (Driving) Data Available No Yes No Yes Yes No No No No

A There is some inconsistency about the use of the term ‘model’ by other entities. We have distinguished between 'Tool' and 'Model' only when the clearinghouse or inventory has used the distinction.

B User support is defined here as technical support for users and their application of specific models that is directly available from the individual clearinghouses or inventories.

Air and Climate

Air Quality Modeling contains links to air quality modeling groups and support centers.

Atmospheric Modeling Group develops models that simulate the transport and fate of pollutants in the atmosphere.

Climate Change Waste Tools contains tools used by EPA to determine the greenhouse impact of various purchasing, manufacturing, and waste management actions.

Climate Economic Models lists models used by the Climate Change Division to assess the economic impacts of climate change.

Emissions Modeling Clearinghouse is a list of models that assess the pollutant emissions of point and non-point sources.

Indoor Air Quality Modeling has created two models that assess the impact of sources, sinks, ventilation, and air cleaners on indoor air quality.

Integrated Planning Model evaluates the economic and environmental impacts of environmental programs on the electric power sector.

Landfill Gas Emissions Model (LandGEM) estimates emission rates for total landfill gas, methane, carbon dioxide, nonmethane organic compounds, and individual air pollutants from municipal solid waste landfills.

Livestock Assessment Model characterizes trends in the populations of cattle and buffalo, and the methane that they emit.

Mid-Atlantic Air Quality Modeling uses models to predict the implications of State Implementation Plans (SIP)’s of government policies.

Mobile Source Ozone Precursor Emissions Characterization and Modeling  uses several models to characterize vehicle emissions.

ORD Natural Risk Management Economics and Performance (Models on left bar)  maintains and develops economic performance models that estimate the costs of air pollution prevention and control.

ORD Natural Risk Management Indoor Environment (Models on left bar) researches models and other methods of measuring indoor air quality trends.

PART5 Model estimates particulate air emissions from highway vehicles.

Radiation Risk Assessment Model Software is a list of models used by the Radiation Protection Program.

Support Center for Regulatory Atmospheric Modeling (SCRAM) supports the EPA Air Quality Modeling Group, which conducts modeling analyses to support policy and regulatory decisions in the Office of Air and Radiation.

TANKS Emissions Estimation Software estimates volatile organic compound (VOC) and hazardous air pollutant (HAP) emissions from fixed- and floating-roof storage tanks.

Technology Transfer Network FERA (Fate, Exposure, and Risk Analysis) includes information on tools used to evaluate the health risks and environmental effects associated with exposure to "criteria" (six common air pollutants including ozone and particles) and toxic air pollutants.

Transportation Models lists models and databases used by EPA Office of Transportation and Air Quality to estimate emissions from on-road vehicles, non-road sources, and fuels.

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Drinking Water, Surface Water and Ground Water

Casual Analysis, Diagnostic Decision Information System (CADDIS) looks for and evaluates causes of biological effects observed in aquatic systems such as streams, lakes and estuaries.

Center for Subsurface Modeling Support (CSMoS) provides users with models used to assess ground-water patterns.

EPANET Drinking Water Model models the hydraulics and water quality of water distribution piping systems.

Great Lakes Modeling provides a group of interwoven models that address facets of the Lake Michigan aquatic ecosystem.

Ground Water Compendium contains fact sheets about models that can be used to analyze ground water quality and quantity.

Office of Water Models lists models, databases, and other resources developed at the EPA Office of Water.

OW Water Quality Models contains several models that assess different aspects of water quality.

Storm Water Management Model simulates rainfall runoff in urban areas for single events or long-term data.

Watershed and Water Quality Modeling Technical Support Center provides access to models and tools that can be used in the development of Total Maximum Daily Loads (TMDL), waste load allocations, and watershed protection plans.

Watershed Management Tools contains several models that assess different aspects of water quality on a watershed scale.

Watershed Mapping Tools lists two models that map and simulate watershed development over time.

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Ecosystems and Landscape Ecology

Ecosystems Research Models lists models that can be used for ecosystems research.

Ecosystems Research Tools provides a list of tools that can be used to assess potential policy implications on ecosystems.

Landscape Ecology Assessment Tools contains links to several tools that can be used to analyze landscape changes.

Mid-Continent Ecology Division Databases and Software lists models that have been developed by the Mid-Continent Ecology Division.

Mid-Continent Ecology Division Models and Methods lists descriptions of models that apply to Mid-Continent Ecology Division research areas.

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Pesticides and Toxic Substances

OPP Models (and Databases) contains aquatic, terrestrial, atmospheric, and health systems models that are used to support pesticide policy.

OPP Water Models contains water models that are used by the Office of Pesticide Prevention.

OPPT Exposure Assessment Models contains models developed by OPPT that look at what happens to chemicals when they are released into the environment.

OPPT Databases and Software lists databases and modeling software used by the Office of Pollution Prevention and Toxics.

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Pollution Prevention

ORD Industrial Pollution Prevention Modeling is a research program in models that allow communities to assess their pollution prevention options.

Pollution Prevention Tools contains tools used to assess pollution prevention techniques and policy.

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Waste Management and Emergency Response

Brownfields Site Assessment and Cleanup Tools contains several tool and other resources that are meant to aid in decision-making for hazardous waste sites.

Emergency Management Tools lists databases and tools used for EPA’s Emergency Management Program.

Modeling Subsurface Petroleum Hydrocarbon Transport contains tools that assess the impacts of groundwater contaminants.

RBCA Fate and Transport Models (PDF) (104 pp, 1 MB, About PDF) lists and describes the models used by OSWER to assess fate and transport factors in their Risk-Based Corrective Action program.

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Pollutant Fate and Transport, Human Exposure, Toxicology and Risk Assessment

An Overview of Exposure Assessment Models Used by the US Environmental Protection Agency. 2010. (70 pp, 745 KB, About PDF) Pamela R.D. Williams, Bryan J. Hubbell, Eric Weber, Cathy Fehrenbacher, David Hrdy and Valerie Zartarian In: Modelling of Pollutants in Complex Environmental Systems, Volume II, Chapter 3. Edited by Grady Hanrahan. Pages 61-131. Published by ILM Publications, a trading division of International Labmate Limited. This chapter is a US Government work and is in the public domain in the United States of America.

Center for Exposure Assessment and Modeling (CEAM) provides models that assess air and water pathways for the spread of organic metals and pollutants.

Ecosystem Research Division creates models that simulate the fate and transport of nutrients, sediments, and pollutants within watershed areas.

Multimedia Integrated Modeling System (MIMS) addresses and simulates a variety of air, water, and soil changes.

NCEA Risk Tools- Human Health lists tools used by the National Center for Exposure Assessment to analyze human health damages from toxin exposure.

NCEA Risk Tools- Ecological lists tools used by the National Center for Exposure Assessment to analyze ecosystem damages from toxin exposure.

ORD Exposure Research Models contains models created by NERL that address chemical exposure to humans and ecosystems.

ORD National Center for Computational Toxicology (NCCT) lists models developed and used by NCCT.

ORD National Exposure Assessment Laboratory (NERL) contains databases and software developed at NERL that examine ecological and human responses to environmental stressors.

Physiologically-based Pharmacokinetic (PBPK) Models develops models that examine how a toxin enters the body, the path a toxin takes as it moves through the body, how it is broken down, and how it exits.

Risk Assessment Tools lists EPA tools and models used for risk assessment.

Risk Management Research Models lists numerous models and databases used by the Risk Management Research Division.

Tool for the Reduction and Assessment of Chemical and Other Environmental Impacts (TRACI) is used to assess the impacts of environmental problems on human health.

Western Ecology Division Models contains models and other tools used for research in the Western Ecology Division.

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Economic Enforcement Models contains five models that are used to analyze the economic aspects of policy decisions and enforcement.

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