Biostatistics
Ecological Risk Assessment
Environmental Audits
Epidemiology
Exposure Assessment
Health Risk Assessment
Reproductive & Endocrine Health
REACH
Toxicology

President's Message

 Sciences International, Inc. (SII), a part of the Tetra Tech Corporation, is a consulting company based in the Washington, DC metropolitan area. Sciences International provides consulting services on scientific and technical issues relating to the impact of chemicals, pharmaceuticals, biologics, and physical agents on human health and the environment.

 Scientists in the company are specialists in epidemiology, statistics, medicine, toxicology, reproductive and endocrine health, and exposure assessment. The scientists’ skills in these broad practice areas are used to study and evaluate a variety of diverse exposures, including industrial chemicals, pesticides, consumer products, fibers, biological agents, and pharmaceuticals.

 The company is proud that its scientists are respected leaders in their specialties and have served clients from both the government and private sectors, including federal and state agencies, private companies, trade associations, and law firms.