The 160-acre Hanahan Water Treatment Plant site is located adjacent to the Goose Creek Reservoir. The reservoir was created in 1902 to provide a source of water for the City of Charleston. Today, the reservoir serves as a back-up water source and is home to a multitude of wildlife species.

The Hanahan Plant site is home to four breeding pairs of osprey. Charleston Water System built three platform nests for the ospreys to prevent them from building nests on adjacent power poles.

More than 1,000 alligators are estimated to live in the reservoir. Occasionally, alligators find their way onto the plant grounds, and Charleston Water System contacts the Department of Natural Resources to relocate them to less inhabited areas.

Charleston Water System has cooperated with the SC Department of Natural Resources to install several Wood Duck nesting boxes along the banks of the reservoir, and each year, DNR personnel conduct nest surveys.

The reservoir and surrounding lands provide a habitat for many other species, including the red fox, deer, bobcat, Great Blue Heron, common gallinule, rails, sandpipers, coots, and egrets.
 

Egrets are a common site around the Hanahan Water Treatment Plant, which is located on the banks of the Goose Creek Reservoir, which once served as Charleston Water System's primary source of water.