Georgetown Water Hardness & Quality Report (2026)

DC Water supplies drinking water to over 700,000 residents in Washington D.C., including the historic Georgetown neighborhood. The primary source is the Potomac River, with water drawn from the Washington Aqueduct's intake at Great Falls, Maryland. Treatment occurs at the Washington Aqueduct facilities, specifically the Dalecarlia and Fort Reno plants, before DC Water distributes it. No local reservoirs or groundwater aquifers supplement this main supply. The vast Potomac River watershed stretches across four states and the District, encompassing key sub-basins like the Upper Potomac and Occoquan.

The water's journey begins with diverse geology. Upstream, the Appalachian Piedmont and Blue Ridge provinces feature resistant crystalline bedrock. Further along, the Valley and Ridge province contains fractured carbonate rocks, primarily Cambrian and Ordovician carbonates like the Boonford Group and Conococheague Formation. These limestone and dolomite formations dissolve, naturally adding calcium and magnesium ions. Downstream, the Coastal Plain contributes unconsolidated sediments. This lithological mix results in a moderately mineralized supply.

Homeowners in Georgetown may notice moderate scale buildup in appliances such as dishwashers, washing machines, and water heaters. Spotting on glassware and filmy residues on fixtures are also common, particularly during warmer months. Kettles and coffee makers might require more frequent descaling. While laundry detergents perform best with additives, regular vinegar or citric acid cleaning can help maintain appliance efficiency. Installing a water softener is an optional but recommended step for those concerned about hard water, as it can extend appliance life and improve how soaps lather. DC Water adheres to Safe Drinking Water Act standards, employing corrosion control for lead and copper, and advanced filtration for organics.