Water Quality - Chapter 93 Existing Use Lakes

This GIS lake layer (which is not part of the official version of Pennsylvania’s Water Quality Standards) is offered to provide a spatial representation of the Aquatic Life Use Tiers contained in the 25 PA Code Chapter 93 for existing uses of surface waters. “Existing uses” are those uses actually attained in the waterbody on or after November 28, 1975, whether or not the uses are specified in 25 Pa. Code Chapter 93. The Department maintains a publicly available list of surface waters that have undergone recent existing use evaluations at its website.