Manassas Water Hardness & Quality Report (2026)

The City of Manassas utility serves approximately 41,757 residents in Manassas, Virginia, within Manassas independent city and adjacent Prince William County areas including Greater Manassas. Water sources include surface water from the Potomac River, treated at Fairfax Water's James J. Corbalis, Jr. Water Treatment Plant, and Lake Manassas, processed at the City of Manassas water treatment plant. The supply is classified as mixed surface water, employing conventional filtration, chloramines, and hypochlorite disinfection to meet state and federal drinking water standards.

The Potomac River watershed, encompassing Lake Manassas, drains a Piedmont region underlain by ancient metamorphic rocks including gneiss and schist of Precambrian to Paleozoic age. These geological formations limit ion exchange, yielding minimally mineralised water low in dissolved solids from bedrock weathering. The absence of significant limestone or dolomite layers results in a naturally soft supply, with surface runoff from forested and urban landscapes further preserving this soft character without significant hardness contributions.

Soft water produces negligible scale buildup, benefiting appliances like water heaters, dishwashers, and washing machines with reduced maintenance needs. Plumbing experiences minimal limescale, extending pipe life, and soap lathers efficiently without excess use. No water softener is recommended, as the soft supply avoids common hard water issues like spotting on glassware or dry skin. Water quality scores 80/100 with minor concerns, including 14 contaminants above health guidelines such as total trihalomethanes (TTHMs) and bromodichloromethane from disinfection byproducts, though no EPA violations are noted; consult the utility's Consumer Confidence Report for full compliance details.