Cutler Bay Water Hardness & Quality Report (2026)

Cutler Bay, Florida, in Miami-Dade County on Biscayne Bay south of Miami — a major south Miami-Dade suburban community, one of Florida's newer municipalities (incorporated 2005, formerly Unincorporated South Dade), a rapidly growing diverse community with significant Caribbean, Central American, and South American immigrant populations, adjacent to the Biscayne National Park boundary and the Florida Keys Overseas Highway — draws its municipal water supply from the Biscayne Aquifer via the Miami-Dade Water and Sewer Department (WASD). Water hardness in Cutler Bay measures 158 mg/L — classified as moderately hard.

Cutler Bay's moderate hardness — slightly softer than north Miami-Dade Country Club (171.5 mg/L) — reflects the south Miami-Dade Biscayne Aquifer characteristics in the Cutler Bay zone. The Biscayne Aquifer at Cutler Bay is hosted in the Holocene Miami Limestone (calcareous oolitic limestone, slightly thinner here than in north Miami-Dade) and the Pleistocene Key Largo Limestone (coralline calcareous limestone of the south Biscayne Bay coast — thinner in the Cutler Bay zone than in the Florida Keys proper). The south Miami-Dade zone's slightly thinner, more mixed calcareous formation produces the moderate 158 mg/L — somewhat softer than the north Miami-Dade calcareous oolite core.

At 158 mg/L, Cutler Bay residents face moderate-to-hard water challenges. Monthly descaling with citric acid solution is recommended for faucet aerators and showerheads. Miami-Dade WASD consistently delivers water meeting all Florida DEP and EPA Safe Drinking Water Act requirements.