College Park Water Hardness & Quality Report (2026)

The City of College Park, Georgia, gets its drinking water from two main sources: the City of East Point Water System, which supplies 83% of the water, and the Clayton County Water Authority, providing the remaining 15%. Both utilities draw from the Chattahoochee River, with water undergoing treatment at facilities like the Hemphill Water Treatment Plant, operated by Atlanta and its partners. College Park is part of the greater Atlanta metro area, and its local Water and Sewer Division manages the distribution to residents. The water's journey begins in the Upper Chattahoochee River watershed, a region characterized by ancient metamorphic rocks such as gneiss, schist, and granite, dating back to Precambrian times. These formations are partly covered by Tertiary sediments, and the water supply also incorporates groundwater from the surficial and Upper Floridan aquifers, which contain Oligocene-Miocene limestone.

The underlying geology of the Piedmont region significantly influences the water's character. Here, ancient metamorphic rocks like gneiss and schist, along with some granite, are prevalent. While the Upper Floridan aquifer does include limestone layers, the overall mineral content picked up from these formations is relatively low compared to areas dominated by coastal limestone. This geological makeup contributes to the water's characteristically soft nature. Watersheds like the Chattahoochee River basin upstream also play a role in diluting mineral concentrations before the water reaches the treatment plants, further ensuring a soft water profile for the Atlanta metro area.

Because College Park's water is soft, homeowners will notice minimal scale buildup in appliances like water heaters, kettles, and dishwashers, which can extend their lifespan. You'll also find that soap lathers easily, and spotting on glassware after washing is rare. A water softener isn't necessary for this supply. Instead, homeowners might occasionally use vinegar to clear any minor deposits and should focus on regular filter changes to maintain appliance efficiency. According to the 2024 Consumer Confidence Report, the water meets all EPA standards for safety, including pH, lead, and copper, with no violations reported. Treatment processes include coagulation, sedimentation, filtration, and disinfection with chlorine, addressing potential contaminants like disinfection byproducts and traces of trans-1,2-Dichloroethylene.