East Riverdale Water Hardness & Quality Report (2026)

Washington Suburban Sanitary Commission (WSSC Water) supplies East Riverdale, Maryland, drawing its water primarily from the Potomac River and Patuxent River. Groundwater from wells in Montgomery and Prince George's Counties also contributes to the supply. Key treatment facilities like the Potomac Water Filtration Plant in Bethesda and the Patuxent Water Filtration Plant in Laurel process this raw water before it reaches the more than 1.8 million residents served across a vast 1,300-square-mile area. This extensive system ensures a reliable flow of treated water to urban neighborhoods and beyond.

The water's journey begins in the Potomac River Basin, traversing the Appalachian Piedmont and Atlantic Coastal Plain. Upstream, the water interacts with schists, gneisses, and quartzites found in the Blue Ridge and Piedmont regions, dissolving minerals from these ancient crystalline rocks. As it flows downstream, Coastal Plain sediments, including the Patapsco and Patuxent Formations, contribute further through river infiltration and aquifer recharge. The Magothy Aquifer, a significant sandy unit, also plays a role, providing groundwater influenced by the surrounding geology. This blend of surface and groundwater, influenced by diverse rock types, results in a moderately mineralized water character.

At its current hardness levels, you'll likely notice scale deposits forming on faucets, showerheads, and inside appliances like dishwashers, washing machines, and water heaters. This buildup can reduce appliance efficiency by as much as 20-30% over time and lead to noticeable clogging of faucet aerators and showerheads within a couple of years. You might also find that soap doesn't lather as easily, requiring more detergent for everyday cleaning tasks. To manage this, monthly descaling with vinegar can help appliances, and you might consider installing a whole-house water softener to significantly extend the lifespan of your fixtures and reduce soap consumption. WSSC Water does maintain a pH between 7.2-8.0 to help control corrosion.