Coral Terrace Water Hardness & Quality Report (2026)

Coral Terrace, Florida, in Miami-Dade County on the Coral Gables western edge, receives its municipal water from the Miami-Dade Water and Sewer Department (WASD), which draws from the Biscayne Aquifer through well fields in the Miami-Dade western portions near the Everglades boundary. WASD treats Biscayne Aquifer water at several regional treatment plants — including the Hialeah Water Treatment Plant and the Alexander Orr Water Treatment Plant — before distributing through the county-wide grid serving this unincorporated community.

The moderately hard 154 mg/L hardness is characteristic of the Biscayne Aquifer across Miami-Dade. The Biscayne Aquifer is one of the most productive and porous shallow karst aquifers in North America — composed of Miami Limestone (upper unit), Fort Thompson Formation (older Pleistocene), and Anastasia Formation — ancient coral reef, lagoonal, and marine shelf deposits forming a highly permeable, solution-riddled limestone platform beneath all of South Florida. As water moves through these ancient carbonate formations it becomes naturally hard, dissolving calcium carbonate from the limestone matrix. The TDS of 398.8 mg/L is somewhat higher than northern Miami-Dade supplies, reflecting Coral Terrace's position in the highly calcareous Coral Gables ridgeland.

At 154 mg/L, Coral Terrace residents deal with moderately hard water requiring regular mineral management. Scale builds in kettles and coffee machines within months, the dishwasher benefits from rinse aid to prevent calcium film on glassware, and bathroom glass and tile develop mineral deposits requiring periodic acidic cleaning. Quarterly descaling of heating appliances is the practical cadence. The PFAS level of 7.4 ppt warrants a certified drinking water filter for daily consumption — residents should install a reverse osmosis under-sink unit for drinking and cooking water.