An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Environmental Modeling Community of Practice

Food Chain Models to Assess Exposures

The EPA Center for Exposure Assessment Modeling (CEAM) distributes simulation models and database software designed to determine exposure levels and effects of environmental contaminants on organisms which make up the food chain.

Available Products

The following food chain models were developed by the U.S. Environmental Protection Agency in conjunction with other government, academic, and commercial institutions. To find out more about a particular model, click on a hyper-linked model name in the table below. The models listed are available for download and are subject to the CEAM distribution and support policy.

Product Name Operating System Key Words Maintained By
ACE Win 9x, NT, 2000, XP acute, chronic, toxicity, concentration, exposure EPA Center for Public Health and Environmental Assessment (CPHEA)
AQUATOX Win XP, Vista, 7 aquatox, simulation model, fate prediction, aquatic systems, effect on ecosystem, ecological risk assessments, aquatic ecosystem CEAM
BASS Win 98, NT, 2000, XP BASS, fish, bioaccumulation, population dynamics, biomass dynamics, rivers, lakes, reservoirs, assessment, fishery, management, regulatory CEAM
FGETS Win 9x, NT aquatic biology, assessment, chemistry, environmental effects, metals, monitoring, NPS related, point source(s), test/analysis, toxicity CEAM
SERAFM MS-Excel 2003 serafm, exposure, assessment, mercury, hg, surface water, pond, stream, river CEAM
Web-ICE Javascript enabled browser toxicity, acute, aquatic, terrestrial, species, exposure EPA Center for Public Health and Environmental Assessment (CPHEA)
WHATIF Win XP(SP2) watershed, health, fish, habitat, macro-invertebrate, biodiversity, BASS, biomass, biota, aquatic ecosystem, MAHA, CVI, hydraulic, bankfull, flow, restoration, food web, mercury, PCB, dioxin CEAM