Holbrook Water Hardness & Quality Report (2026)

The Holbrook Public Works Department supplies drinking water to Holbrook, Massachusetts, drawing from groundwater sources. This system relies on wells tapping into local aquifers within the Neponset River watershed and nearby coastal drainages. Treatment is carried out at facilities operated by the department, with a shared mailing address at 65 East Main Street, Avon, MA 02322. The Randolph/Holbrook Joint Water Board also plays a role in source water assessment and protection for the area. Unlike systems dependent on surface water, Holbrook's supply is sustained by water infiltrating through glacial deposits.

Holbrook's groundwater originates from the coastal plain aquifer, a formation composed of Quaternary glacial sands and gravels. These unconsolidated deposits lie atop bedrock from the Proterozoic Z and Ordovician periods, specifically the Blue Hills complex, which includes Quincy Granite and Braintree Slate. The geology is characterized by a lack of significant carbonate formations. This geological makeup means the water has very low dissolved mineral content, resulting in a characteristically soft water profile for the region.

Homeowners in Holbrook will likely notice that their soft water doesn't leave much scale on appliances or plumbing. This means less frequent cleaning of fixtures, water heaters, and dishwashers, and you'll find that soaps and detergents create a richer lather. While the water quality scores well overall, there are a few concerns, including some contaminants exceeding EPA health guidelines, with potential PFAS presence. Tapwaterdata.com suggests considering a filter, and the utility adheres to MassDEP regulations, including those for PFAS. Regular monitoring confirms that pH and lead/copper levels meet required standards.