Rockland Water Hardness & Quality Report (2026)

The Abington/Rockland Joint Water Works (ARJWW) serves 34,952 people across Abington and Rockland, Massachusetts. The utility's primary office is at 366 Centre Avenue, Rockland, and the system serves Plymouth County and surrounding areas. Three water sources and multiple treatment plants operate within the distribution network. The water supply draws from a mixed system of surface water — including the Hingham Street Reservoir — and groundwater sources. Residents can access annual Consumer Confidence Reports and water quality data through the utility's official publications.

Rockland's water supply sits within the Boston Basin, underlain by Precambrian metamorphic bedrock — primarily granite and gneiss — overlain by Quaternary glacial deposits. This geological setting contributes to a hard water supply, as bedrock and glacial materials contain dissolved minerals including calcium and magnesium that persist through the water cycle. The combination of ancient crystalline rock and glacially reworked sediments produces the elevated mineral content characteristic of the region.

Hard water in Rockland causes typical scale buildup in appliances, reduces soap effectiveness, and leaves mineral deposits on fixtures and glassware. Water heaters and dishwashers operate at reduced efficiency, and laundry may require additional detergent. A water softener is recommended for households. As of early 2026, ARJWW is addressing significant PFAS-6 contamination; the Hingham Street Reservoir tested at 22.88 ppt in March 2021, exceeding the 20 ppt limit. Permanent treatment solutions at both water treatment plants are expected in compliance with EPA and DEP regulations. A self-service water filling station providing PFAS-6 levels below 20 ng/L is available for sensitive subgroups. Current data indicates 5 contaminants above EPA MCLGs, though the system reports zero MCL violations.