Springton Lake (also known as Geist Reservoir) is a reservoir in Delaware County in the U.S. state of Pennsylvania. Created in 1931 when Crum Creek was dammed near Pennsylvania Route 252, it is an approximately 391-acre (1.58 km2) drinking-water reservoir maintained by Aqua America. The reservoir is within Newtown Township, Marple Township, and Upper Providence Township.
Until the last two decades, the reservoir was open to fishing via an entrance on Gradyville Road in Newtown Township. There is still a wide array of aquatic life in the reservoir, which includes largemouth and smallmouth bass, crappie, various pan fish, muskie, trout, and catfish. There is also a bald eagle which has a nest on the Upper Providence side of the reservoir. The reservoir is patrolled by Aqua America security during day hours.