Colts Neck Water Hardness & Quality Report (2026)

The Colts Neck Township Municipal Utilities Authority supplies Colts Neck Township residents with water drawn from groundwater wells. These wells tap into the Kirkwood–Cohansey aquifer system, a vast regional groundwater body found within the Atlantic Coastal Plain. The water undergoes minimal treatment, typically involving disinfection with chlorine and sometimes removal of iron and manganese to address aesthetic issues like staining and taste. The Kirkwood–Cohansey aquifer itself, comprising Cretaceous-age Kirkwood Formation sands and Tertiary-age Cohansey Formation sands and gravels, recharges easily from rainfall and is known for its high permeability.

These aquifer sediments, deposited during the Cretaceous and early Tertiary periods, are rich in minerals containing calcium. As groundwater percolates through the porous layers of sand and gravel, it dissolves these calcium-rich components. This natural process leads to a hard water supply, characteristic of the New Jersey Coastal Plain's geology. The aquifer system spans parts of New Jersey and neighboring states, contributing to the distinct mineral content found in the local water.

Homeowners in Colts Neck will likely notice scale buildup on fixtures and inside appliances due to the water's hardness. Devices like dishwashers, coffee makers, and water heaters can accumulate mineral deposits, which may reduce their efficiency and lifespan. Regular cleaning with vinegar-based solutions and periodic flushing of water heaters can help manage scale. For persistent issues such as spotty dishes or stiff laundry, a water softener is often a practical solution. While the water generally meets safety standards, recent analyses have identified PFAS compounds above health guidelines, prompting recommendations for certified tap filters. Older homes should also consider testing for lead and copper, especially if lead service lines are present.