The relationship between health attribution belief systems and compliance in an ecological treatment regimen was examined in 40 patients with environmental illness. Internal and chance scales on the Health Attribution Test (HAT) were found to be related to reported level of compliance for each subject. Data were subjected to Chi square analysis with highly significant results obtained. Ecology patients appear to take responsibility for their own health and treatment and, although they feel themselves to be victims of fate, they comply with treatment on a high level.