Cobbs Creek Water Hardness & Quality Report (2026)

Cobbs Creek, Philadelphia, Pennsylvania — a major west Philadelphia neighborhood (Cobbs Creek is a significant west Philadelphia neighborhood along the Cobbs Creek boundary between Philadelphia and Delaware County — one of the densely populated west Philadelphia residential neighborhoods, historically a working-class and middle-class neighborhood), adjacent to Cobbs Creek Park (one of the major Fairmount Park system parks in west Philadelphia — the Cobbs Creek Parkway and creek valley form a significant natural greenway in the otherwise dense west Philadelphia urban fabric), a diverse Philadelphia County community with a significant African-American and West Indian-American population, and one of the communities most affected by the transformation of west Philadelphia — draws its municipal water supply from the Schuylkill and Delaware Rivers via the Philadelphia Water Department. Water hardness in Cobbs Creek measures 141.5 mg/L — classified as moderately hard.

Cobbs Creek's moderate hardness reflects the Philadelphia Water Department's supply blend and the west Philadelphia distribution zone. The PWD Schuylkill and Delaware River supply blends calcareous-moderate supply (treated for coagulation and softening) and distributes to the Cobbs Creek west zone via predominantly early 20th century residential development mains, producing the moderate 141.5 mg/L.

At 141.5 mg/L, Cobbs Creek residents encounter moderate scale accumulation. Monthly cleaning with citric acid solution is recommended. Philadelphia Water Department consistently delivers water meeting all Pennsylvania DEP and EPA Safe Drinking Water Act requirements.