Shaw Water Hardness & Quality Report (2026)

Shaw, Washington, DC, in District of Columbia — a historic DC neighborhood adjacent to Howard University and U Street Corridor in northwest Washington, a historic center of African American culture and civil rights history — receives its municipal water from DC Water, drawing from the Potomac River at the Washington Aqueduct and distributed through the DC Water distribution system.

The moderately hard 132 mg/L hardness and TDS of 338 mg/L are slightly harder than other DC neighborhood readings (Golden Triangle: 113 mg/L, TDS 253), reflecting normal variation across DC Water's distribution system — possibly seasonal Potomac variation (late summer low-flow periods produce harder water from the Shenandoah tributary input) or distribution zone differences. All DC Water neighborhoods share the same Potomac River Appalachian carbonate supply and the Washington Aqueduct treatment system.

At 132 mg/L, Shaw's water is moderately hard — scale builds in kettles and appliances over months, dishwashers benefit from rinse aid, and bathroom fixtures develop calcium deposits. Quarterly descaling is appropriate. The PFAS level of 9.2 ppt warrants a certified reverse osmosis drinking water filter — Bolling Air Force Base (DC — AFFF), Andrews AFB (AFFF), and the Washington DC industrial-military PFAS complex produce Shaw's very elevated readings.