Sanford Water Hardness & Quality Report (2026)

Sanford, Maine, in York County — the second-largest city in York County in southwestern Maine, the former textile mill city on the Mousam River with a historic manufacturing heritage, now a diversified service and residential community — receives its municipal water from Sanford Water, which draws from Mousam Lake and the Mousam River reservoir system in the southern Maine upland watershed of the York County interior.

The very soft 35.5 mg/L hardness and low TDS of 69.5 mg/L reflect the Mousam River watershed's southern Maine metamorphic geological character. The Mousam River watershed in York County drains the Southern Maine Upland — underlain by the Silurian-Devonian metasedimentary sequence of southern Maine, including the Kittery Formation (phyllite and metasiltstone), Berwick Formation (quartzofeldspathic schist), and the Cape Neddick Metanorthosite and associated Harpswell Metamorphic Complex. These Silurian-Devonian metamorphic rocks have essentially no carbonate content, producing characteristically very soft, low-mineral southern Maine reservoir water. Sanford's 35.5 mg/L hardness is consistent with the York County metamorphic watershed supply zone.

At 35.5 mg/L, Sanford's water is very soft — excellent for household use. Scale essentially never forms under normal conditions, soap lathers abundantly, and appliances maintain excellent efficiency. Annual descaling is more than sufficient. The PFAS level of 3.2 ppt is very good for southern Maine — Sanford's limited direct military and heavy industrial PFAS sources and the Mousam Lake watershed's rural-suburban character produce a modest PFAS background, though the greater York County corridor's industrial textile history contributes to the mild background reading.