Pictured are some homes in the Harmon's Landing area on the east side of Grand Lake. Some homeowners claim their property values have dropped due to the blue-green algae problem in the lake. Recent indicators say home values are on the rise, but officials admit more data is needed to make an accurate assumption.

The economic impact of Grand Lake's blue-green algae crisis is about as murky as its water. Sales tax revenues in Mercer County rose 2 percent this summer over the same time period last year and recent lake-area home sales show . . .