An analysis of all valid single family house sales over a four-year period before the March, 1979, TMI accident and over the 9 months following the accident, and within a 25-mile radius of the plant and in two control areas, disclosed no evidence that the accident had measurable lasting effects on residential property values. Shortly following the accident there was a sharp decline in the volume of residential sales within 10 miles of the plant, but the real estate market returned to normal within a month, considering the financial market conditions at that time.