Brunswick Water Hardness & Quality Report (2026)

Brunswick, Maine, in Cumberland County — a Cumberland County town adjacent to Topsham and Bath on the Androscoggin River in southwest Maine — receives its municipal water from the Brunswick and Topsham Water District, drawing from the Androscoggin River (Cumberland County) through the southwest Maine water treatment system.

The very soft 29 mg/L hardness and very low TDS of 53.7 mg/L reflect the southwest Maine Androscoggin River supply's nearly insoluble White Mountains crystalline character — consistent with other Androscoggin-served Maine communities (Lewiston: ~30 mg/L; Auburn: ~28 mg/L). The Androscoggin River at Cumberland County drains the White Mountains — Devonian Littleton Formation (schist — insoluble), Devonian New Hampshire Plutonic Suite (granite — insoluble), and Ordovician Quimby Formation (insoluble metamorphic). The entirely insoluble New England crystalline basement produces the very soft southwest Maine supply.

At 29 mg/L, Brunswick's water is very soft — essentially no scale forms, soap lathers abundantly, and appliances maintain excellent efficiency. Annual descaling is sufficient. The PFAS level of 2.9 ppt warrants a certified drinking water filter — Naval Air Station Brunswick (decommissioned — historic AFFF use, the primary Maine PFAS legacy source directly at Brunswick) has contributed to local groundwater PFAS background despite the surface water supply's low readings.