Tamiami Water Hardness & Quality Report (2026)

Tamiami, an unincorporated census-designated place in Miami-Dade County, Florida, receives its drinking water from the Miami-Dade Water and Sewer Department (WASD), the primary utility serving the region. The supply is sourced entirely from groundwater extracted from the Biscayne Aquifer locally and the deeper Floridan Aquifer System via numerous production wells. Key facilities include the Alexander Orr Jr. Water Treatment Plant and the Hialeah Water Treatment Plant, which process raw groundwater through lime softening, filtration, and disinfection to serve over 2.4 million residents across Miami-Dade County.

The local watershed falls within the Miami-Dade County groundwater basin, part of the larger South Florida hydrologic system. Water originates in the unconfined Biscayne Aquifer, a Quaternary-age limestone formation, with deeper supplies tapping the Floridan Aquifer System's Ocala Limestone and Avon Park Formation — Eocene-Oligocene carbonate layers. This karst geology, with its soluble carbonate rocks and solution cavities, naturally enriches groundwater with dissolved calcium and magnesium, resulting in a hard supply character typical of coastal southern Florida.

Very hard water in Tamiami leads to significant scale buildup in pipes, water heaters, dishwashers, and washing machines, reducing efficiency and increasing energy costs. Soap lathering is poor, leaving films on skin, hair, and dishes. Regular descaling of appliances and vinegar soaks help mitigate issues. A water softener is strongly recommended for households to prevent these effects and extend equipment life. Miami-Dade WASD reports post-treatment pH typically 7.5–8.5; the utility complies with EPA lead and copper rules, and treatment includes aeration, lime softening for partial hardness reduction, conventional filtration, and chloramine disinfection.