Peachtree Corners Water Hardness & Quality Report (2026)

Peachtree Corners receives its drinking water from the Gwinnett County Department of Water Resources (DWR), which serves Gwinnett County and surrounding areas in metro Atlanta, including the city of Peachtree Corners. The primary source is Lake Lanier, a major reservoir impounded on the Chattahoochee River, supplemented by direct intakes from the Chattahoochee River itself. Water is treated at the T. Jackson King III Water Production Plant (formerly known as the Shoal Creek plant) and other facilities operated by Gwinnett DWR, which processes surface water through coagulation, sedimentation, filtration, and disinfection to meet EPA standards.

The supply lies within the Upper Chattahoochee River Basin watershed, draining the southern Appalachian Piedmont region. No major aquifers are involved, as this is exclusively surface water. The local geology features ancient metamorphic rocks — gneiss, schist, and amphibolite — from Precambrian-Paleozoic formations of the Dahlonega Gold Belt and Atlanta Ridge, which weather slowly and contribute modest levels of calcium and magnesium through surface runoff and soil weathering. This Piedmont geology imparts a moderately mineralised character to the water, distinguishing it from softer Appalachian headwater streams or harder coastal plain groundwaters.

At slightly hard to moderately hard levels, the water may leave minor scale deposits on fixtures and appliances — dishwashers, washing machines, and water heaters — over time, potentially reducing efficiency and requiring occasional descaling. Soap lathering can be slightly reduced, leading to higher detergent use. Maintenance tips include regular cleaning of aerators and showerheads with vinegar. A water softener is optional for slightly hard water but recommended for households sensitive to moderate hardness effects. Gwinnett County's 2024 Consumer Confidence Report confirms compliance with EPA standards for all regulated contaminants, including lead and copper; treatment involves chlorination for disinfection, which can impart a mild taste reducible by carbon filters.