Brightwood Water Hardness & Quality Report (2026)

Brightwood, Washington, DC, in District of Columbia — a DC neighborhood adjacent to Petworth and Manor Park in upper northwest Washington — receives its municipal water from DC Water, drawing from the Potomac River at the Washington Aqueduct and distributed via the Dalecarlia and McMillan reservoir system.

The moderately hard 130 mg/L hardness and TDS of 328.5 mg/L are consistent with other northwest DC neighborhood readings (Shaw: 132 mg/L, TDS 338) — all receiving the same DC Water Potomac River supply through the Washington Aqueduct system. The slight hardness variation across DC neighborhoods reflects distribution zone effects and seasonal Potomac variability rather than source differences. The underlying supply geology — Potomac River Appalachian carbonate drainage — is shared by all DC Water customers.

At 130 mg/L, Brightwood's water is moderately hard — scale builds in kettles and appliances over months, dishwashers benefit from rinse aid, and faucet aerators need periodic cleaning. Quarterly descaling is appropriate. The PFAS level of 9.0 ppt warrants a certified reverse osmosis drinking water filter — Bolling Air Force Base (DC — AFFF), Andrews AFB (AFFF in the Potomac watershed), and the Washington DC PFAS complex contribute to Brightwood's very elevated readings.