Damascus Water Hardness & Quality Report (2026)

Damascus, Maryland's water originates from WSSC Water, a utility serving Montgomery County and Prince George's County. The primary source is the Potomac River, supplemented by groundwater wells. Water undergoes treatment at facilities like the Washington Aqueduct and WSSC's own plants before reaching residents. This mixed supply, drawing from both surface water and local aquifers, ensures a consistent flow to over 1.8 million customers. The Potomac River watershed itself traverses diverse geological areas, contributing to the water's characteristics as it moves through the Appalachian region towards the Coastal Plain.

Geologically, the water's journey involves interacting with formations rich in calcium and magnesium. In the Damascus area, Coastal Plain aquifers, remnants of marine environments, contain weathered shell materials like calcite and aragonite. These carbonate-rich rocks readily dissolve, imparting hardness to the groundwater. Further influencing the water chemistry are underlying limestone and sedimentary rock formations common in Montgomery County. As water percolates through these layers, it picks up additional mineral content, contributing to the naturally high mineral content that defines the local supply.

Homeowners in Damascus may notice the effects of this mineral-rich water. White scale often forms on faucets, inside water heaters, and within appliances such as dishwashers and washing machines, which can reduce their efficiency and shorten their lifespan. You'll likely see limescale buildup in kettles and a film of soap scum in sinks and showers. Over time, these deposits can even restrict flow in plumbing. To combat this, regular descaling with vinegar or installing a water softener are practical solutions recommended by WSSC Water to mitigate potential damage and improve appliance performance.