Hillcrest Water Hardness & Quality Report (2026)

Hillcrest, District of Columbia, in Washington DC — a historic DC neighborhood adjacent to Congress Heights and Anacostia on the east side of the Anacostia River — receives its water from DC Water, drawing from the Potomac River through the Washington DC distribution.

The moderately hard 94 mg/L hardness and TDS of 180.1 mg/L reflect the DC supply's moderate Potomac River character at the southeast DC distribution zone — the Cambrian Tomstown Formation contributes calcareous mineral content from the Shenandoah Valley limestone corridor, while the Precambrian Blue Ridge Basement provides insoluble dilution; DC Water distributes consistent Potomac supply throughout all DC neighborhoods, with minor variation by distribution zone (compare Congress Heights DC: 92/176 in District of Columbia comparable; Anacostia DC: 96/184 in District of Columbia comparable; Hillcrest consistent moderate from the same District of Columbia Potomac River Cambrian calcareous supply). The Potomac River at DC — Cambrian Tomstown Formation (calcareous — primary hardness contributor), Precambrian Blue Ridge Basement (insoluble — primary dilutant), and Quaternary Potomac River alluvium (calcareous — TDS contributor).

At 94 mg/L with TDS 180, Hillcrest's water is moderately hard — mild scale buildup. Semi-annual descaling is appropriate. The PFAS level of 5.8 ppt warrants a certified drinking water filter. Review DC Water's annual water quality report.