Leominster Water Hardness & Quality Report (2026)

Leominster Water Division supplies drinking water to approximately 40,631–43,782 residents in Leominster, Massachusetts, primarily from surface water sources including Fallbrook Reservoir, Notown Plant intake, Distributing Reservoir, and Southeast Wells. The utility operates conventional treatment including pre-filtration optimization, chlorine hypochlorite disinfection, and corrosion control. Recent infrastructure upgrades include a new plant at Distributing Reservoir and manganese mitigation at Fallbrook. The division is contactable at 978-534-7500 and located at 25 West Street, Leominster, MA 01453; annual Consumer Confidence Reports are published on the city's official website.

The supply draws from the Nashua River watershed, encompassing local reservoirs amid hilly terrain in the Worcester County highlands. These formations feature metamorphic bedrock and glacial deposits that release minerals into surface water, yielding a hard character. Seasonal influences such as excess rainfall can stir sediments at Fallbrook Reservoir, affecting clarity but not toxicity per city statements. The watershed's limestone-influenced soils and fractured bedrock amplify mineralisation compared to softer coastal aquifer profiles.

Hard water promotes scale buildup in pipes, heaters, dishwashers, and washing machines, reducing efficiency and lifespan. Kettles develop limescale and fixtures show mineral deposits over time. Regular vinegar descaling, low-flow aerators, and magnetic treatments help mitigate effects. A whole-house softener is often recommended to extend appliance life and improve soap efficiency. The utility reports contaminants above EPA health guidelines including ethylene dibromide, radiologicals, heptachlor epoxide, atrazine, TTHMs, chloroform, and hexavalent chromium; treatment involves conventional filtration and hypochlorite disinfection, with recent brown water episodes at Fallbrook deemed safe but unpalatable.