TN&A offers complete services for human health and ecological risk assessment. Current clients include the USEPA National Center for Environmental Assessment (NCEA), USEPA Regional Offices, USACE, US Army Center for Health Promotion and Preventive Medicine (CHPPM), Air Force Center for Environmental Excellence, and USDA Forest Service. The high level of scientific support we offer clients is evidenced by the following successfully completed or ongoing projects.

TN&A currently provides ecological risk assessment technical support to the USEPA-NCEA. TN&A develops ecological risk assessment methods, prepares guidance documents, performs stressor identification for streams and terrestrial sites, conducts climate change assessments, organizes scientific conferences, develops interactive databases, and develops Internet sites. TN&A provided support to the NCEA Superfund Technical Support Center by preparing quantitative human health toxicological evaluations of many chemicals of importance at environmental sites. TN&A has also prepared wildlife toxicity reference values for many chemicals for the US Army CHPPM.