Parkville Water Hardness & Quality Report (2026)

Baltimore City Department of Public Works (DPW) supplies municipal water to Parkville in Baltimore County, Maryland, providing service to over 1.8 million people across Baltimore City and surrounding counties. Primary sources are surface water from Liberty Reservoir, Prettyboy Reservoir, and Loch Raven Reservoir on the Gunpowder Falls watershed, supplemented by the Patapsco River. Treatment occurs at the Montebello Water Filtration Plant and Ashburton Water Filtration Plant, using coagulation, sedimentation, filtration, and chloramination before distribution.

The watershed encompasses the Liberty, Prettyboy, and Loch Raven reservoirs within the Patapsco River and Gunpowder River basins. Underlying geology features Coastal Plain sediments with carbonate rock formations from marine deposits, including shell-based materials of calcite, aragonite, and magnesium calcite. As water percolates through these formations, calcium and magnesium ions dissolve into the supply, imparting a hard character typical of Maryland's eastern regions with sedimentary bedrock and marine-origin sediments.

Hard water in Parkville leads to scale buildup on fixtures, reduced soap lathering, and spots on dishes and glassware. Most affected appliances include water heaters, dishwashers, washing machines, and coffee makers, where mineral deposits reduce efficiency and lifespan. Regular vinegar descaling, installing scale inhibitors, or using a water softener is recommended to mitigate these effects and protect plumbing. Baltimore DPW's Consumer Confidence Reports confirm EPA compliance with pH 7.0–8.5, lead and copper below action levels, no notable PFAS exceedances, and disinfection byproducts including TTHMs and haloacetic acids staying below MCLs.