Collierville Water Hardness & Quality Report (2026)

Collierville Water Department provides drinking water to approximately 44,737 residents in Collierville, Tennessee, within Shelby County. The utility sources all its supply from groundwater extracted via ten wells tapping into the Memphis Sand aquifer at depths around 350 feet. Water is pumped to one of four treatment plants for processing before distribution. The department can be reached at 901-457-2800 or 500 Keough Rd, Collierville, TN 38017. Treatment involves standard groundwater processes — disinfection, filtration, and corrosion control — before the supply reaches residents.

The Memphis Sand aquifer underlies the Mississippi Embayment, a broad sedimentary basin filled with Cenozoic sands, clays, and minor carbonates. Water percolates through these layers, acquiring dissolved minerals from subtle carbonate influences in the regional geology. The sandy matrix limits excessive mineral pickup compared to limestone-dominated karst systems elsewhere in Tennessee, yet the aquifer's proximity to carbonate-rich formations results in a moderately mineralised supply. The aquifer's confined nature protects it from surface contamination while imparting a consistent mineral profile reflective of the embayment's depositional history.

At moderately hard levels, scale buildup becomes noticeable in appliances like water heaters, dishwashers, and coffee makers, reducing efficiency and lifespan. Laundry may feel stiffer, and soap lathering decreases, prompting higher detergent use. Regular vinegar descaling, low-flow fixtures, and magnetic descalers help mitigate effects; a water softener is often recommended for households. Reports note potential contaminants including chromium, dibromoacetic acid, chlorite, and 1,3,5-trimethylbenzene above some health guidelines, though the utility complies with EPA standards. Activated carbon filtration is suggested for additional contaminant reduction.