Maplewood Water Hardness & Quality Report (2026)

Maplewood, Minnesota, lacks a single municipal water utility and relies on multiple providers serving its 26,000 residents in Ramsey County. The primary supplier is St. Paul Regional Water Services (SPRWS), delivering treated Mississippi River water via the Robert Street Treatment Plant and other facilities to most households. Bordering utilities including Washington County Water Conservancy District and the Northeast Metro Water Alliance supplement supply, while a minority of residents use private wells drawing from local aquifers. Treatment at SPRWS involves coagulation, sedimentation, filtration, chloramination, and fluoridation at plants including Cretin and University.

The water originates in the Mississippi River watershed, flowing through the Twin Cities metro area. Underlying geology features Cambrian and Ordovician sandstones and limestones of the Jordan and Prairie du Chien aquifers, with the river cutting through Paleozoic bedrock exposures. Mount Simon Sandstone and Driftless Area carbonate outcrops enrich the chemistry with bicarbonates. Glacial deposits from the Wisconsinan glaciation overlay these formations, creating unconfined aquifers. This limestone and dolomite-rich terrain imparts a hard character through mineral leaching, while river dilution moderates extreme mineralization.

At moderately hard levels, users notice scale buildup in dishwashers, water heaters, and coffee makers, with spotty glassware and reduced soap efficiency in laundry. Faucet aerators and showerheads may clog over time. Regular vinegar descaling and annual appliance flushes help; a water softener is often recommended, especially for households on well water or high-use homes. SPRWS reports typical pH around 7.5–8.5 with full lead and copper rule compliance under EPA limits; no recent PFAS exceedances noted in available analyses. Private wells require individual testing for nitrates and bacteria.