Germantown Water Hardness & Quality Report (2026)

Germantown, Pennsylvania, in Philadelphia County — a Philadelphia County neighborhood adjacent to Cheltenham and Chestnut Hill in northwest Philadelphia — receives its water from the Philadelphia Water Department, drawing from the Schuylkill River and Delaware River through the southeast Pennsylvania distribution.

The moderately hard 89.5 mg/L hardness and TDS of 137.6 mg/L reflect the Philadelphia County supply's moderate Piedmont character — the Precambrian Wissahickon Formation provides insoluble metamorphic dilution, while the Cambrian Cockeysville Marble contributes calcareous mineral content from its marble and calcareous gneiss in the Pennsylvania Piedmont (compare Cheltenham PA: 86/131 in Montgomery County comparable; Chestnut Hill PA: 91/143 in Philadelphia County comparable; Germantown consistent moderate from the same Philadelphia County Schuylkill River Precambrian supply). The Schuylkill watershed — Precambrian Wissahickon Formation (insoluble — primary dilutant), Cambrian Cockeysville Marble (calcareous — primary hardness contributor), and Quaternary Schuylkill alluvium (slightly calcareous — minor TDS).

At 89.5 mg/L with TDS 138, Germantown's water is moderately hard — mild scale buildup. Semi-annual descaling is appropriate. The PFAS level of 4.4 ppt is moderate — a certified drinking water filter provides added protection. Review the Philadelphia Water Department's annual water quality report.