In the Person-Environment (P-E) Congruence model, psychological well-being is proposed to be a function of the degree of fit between the perceived environment and the important needs of the individual; and, that in more restricted environments, the relationship is stronger. The present study examined, cross-sectionally and longitudinally, the Congruence levels and well-being of elderly veterans (N = 165) in four microenvironments within a single instutition. Congruence was assessed using the multidimensional Environmental Perception, Preference and Importance Scale (EPPIS). Well-being was measured using the PGC Moral Scale, the Life Satisfaction Index A and a semantic differential self-concept scale. There were significant microenvironment differences on three of the 15 EPPIS dimensions; the P-E Congruence scores were predictive of well-being; and, the specific dimensions predictive of well-being varied across microenvironments, criterion of well-being and time. The data reinforces the notion that treatment programs must be individualized and that the P-E model, operationalized in the EPPIS, may serve as a viable clinical tool.