Somerville Water Hardness & Quality Report (2026)

NJ American Water manages the Raritan System 2, a significant water supply serving Somerville in Somerset County, New Jersey, along with neighboring areas in Hunterdon, Mercer, and Somerset counties. The system draws from multiple sources, including surface water from the Raritan River, Millstone River, and the Delaware & Raritan Canal. This is complemented by approximately 98 wells that tap into local aquifers. All water undergoes treatment at facilities operated by American Water, and distribution is overseen through their dedicated hotline. The Raritan-Millstone watershed provides the initial source, where water comes into contact with Triassic-age basalt, sandstone, and shale formations belonging to the Brunswick Group. Sediments from the Passaic Formation and the Stockton Conglomerate are also part of the geological makeup, with Glacial Drift aquifers influencing infiltration.

This varied geology naturally imparts a hard character to the water supply. As water flows through or sits within these geological structures, it dissolves minerals like calcium and magnesium. The presence of carbonate-influenced soils and fractured bedrock, particularly in formations like the Brunswick Group and Stockton Conglomerate, contributes significantly to this mineral leaching. Consequently, the water drawn from both surface and groundwater sources is naturally mineralized, resulting in a supply that is characteristically hard. This mineral content is a direct result of the interaction between water and the underlying rock and soil composition prevalent in the region.

Homeowners often notice the effects of this mineral-rich water on their plumbing and appliances. Scale accumulation is common in pipes, water heaters, and devices like dishwashers and washing machines, which can reduce their efficiency and shorten their lifespan. You might observe visible buildup on fixtures and inside boilers, leading to increased energy costs. To combat these issues, regular cleaning with vinegar can help remove minor scale. For more persistent problems, installing scale inhibitors or a whole-home ion-exchange water softener is a recommended solution to protect your plumbing and maintain appliance performance. While the water's pH is generally within acceptable limits, the hardness level requires attention for optimal household function.