Pine Bluff Water Hardness & Quality Report (2026)

Pine Bluff, Arkansas, the Jefferson County seat in southeast Arkansas on the Arkansas River — the 'Natural State's River City,' a historic Arkansas River port city and regional commercial hub, home of the University of Arkansas at Pine Bluff (UAPB), the Pine Bluff Convention Center, and a city known for its rich African-American cultural heritage (a significant Reconstruction-era community, home of the Delta blues tradition in south Arkansas) — draws its municipal water supply from the Arkansas River via the City of Pine Bluff Water and Sewer Department. Water hardness in Pine Bluff measures 123.5 mg/L — classified as moderately hard.

Pine Bluff's moderate hardness reflects the Arkansas River's calcareous Plains–Coastal Plain watershed characteristics. The Arkansas River at Pine Bluff carries drainage from: the Oklahoma and Kansas calcareous Cretaceous–Tertiary plains (upstream Arkansas River drainage — calcareous watershed from the Great Plains to central Arkansas); the Ouachita Mountains siliciclastic terrain (moderately calcareous sandstone and shale), and the Gulf Coastal Plain calcareous sediments of the lower Arkansas River Valley. The City of Pine Bluff applies effective water treatment to the Arkansas River supply, producing the moderate 123.5 mg/L at Pine Bluff household taps.

At 123.5 mg/L, Pine Bluff residents encounter moderate scale accumulation. Faucet aerators and showerheads develop deposits after several months — monthly cleaning with citric acid solution is practical maintenance. City of Pine Bluff Water and Sewer Department consistently delivers water meeting all Arkansas DEQ and EPA Safe Drinking Water Act requirements.