The tools of our trade are environmental site and indoor air quality assessments, risk characterizations, remediation technologies, emergency response services, occupational health and safety services, loss control surveys, risk management consulting, safety services, and litigation/expert witness support. Founded in 1986, HETI is a full-service, nationwide environmental services company specializing in environmental and indoor air quality site assessment, site remediation, risk characterization, occupational health and safety services, and litigation/expert witness support.