West Scarborough Water Hardness & Quality Report (2026)

The Portland Water District (PWD) serves West Scarborough, Maine, as part of its Greater Portland service area in Cumberland County, providing water to over 200,000 residents across 200 square miles. The primary source is Sebago Lake, New England's second-largest lake, supplemented by the Presumpscot River. Water is treated at the Riverton Facility, the main treatment plant, with additional distribution from the Stroudwater and other booster stations. No groundwater sources are utilized in this system.

The Sebago Lake watershed spans 370 square miles of forested uplands in southern Maine, protected by state regulations limiting development. Underlying geology consists of Precambrian and Devonian igneous and metamorphic rocks, including granites and schists of the Sebago Pluton (quartz monzonite and granite), with sparse carbonate outcrops. Absence of extensive limestone or evaporite formations results in very soft water, as surface runoff and lake storage pick up few dissolved minerals; glacial sandy tills filter percolating water minimally, preserving low ionic content.

With soft water, scale buildup is negligible, protecting water heaters, pipes, and fixtures from mineral deposits. Soap lathers easily, reducing usage and preventing scum on dishes or skin dryness. No softener is necessary or recommended, avoiding risks such as sodium addition or corrosion from over-softening; routine aerator cleaning suffices for maintenance. pH is typically 6.5–7.5, meeting EPA standards. The district complies with lead and copper rules; no notable PFAS detections are reported in recent CCRs. Treatment includes screening, chloramine disinfection, and UV for redundancy.