This paper develops estimates of environmental improvement in the Puget Sound region of Washington State. The analysis involves four steps: (i) ten hedonic price functions are estimated year-by-year (ii) a computation of the marginal implicit price of distance from air release, superfund, and toxic release sites; (iii) a series of implicit demand functions describing the relationship between the price of distance and the quantity consumed; and (iv) an evaluation of the potential scale of benefits associated with some basic environmental improvement scenarios. The analysis provides additional evidence for developing a structural model of implicit demand within a single housing market and suggests that the benefits of environmental improvement are substantial.