Miami Gardens Water Hardness & Quality Report (2026)

Miami Gardens, Florida — a major city in northern Miami-Dade County and home to Hard Rock Stadium — draws its municipal water supply from the Miami-Dade Water and Sewer Department (MDWASD), sourcing from the Biscayne Aquifer via MDWASD's wellfield network in northern Miami-Dade County and Hialeah. MDWASD operates several major wellfields including the Hialeah–Preston, Miami Springs, and John E. Preston wellfields, drawing from the Miami Limestone and Fort Thompson Formation of the Biscayne Aquifer at depths of 10–60 feet. Water is treated at the Hialeah, John E. Preston, and Alexander Orr water treatment plants. Water hardness measures 88 mg/L — classified as moderately soft, notably lower than other southeast Florida Biscayne Aquifer cities.

Miami Gardens' relatively soft supply within southeast Florida reflects the northern Miami-Dade wellfield zone's Biscayne Aquifer character. The MDWASD northern wellfields draw from an area with active Everglades freshwater recharge — the natural hydraulic gradient from the Everglades water conservation areas pushes fresh, recently recharged groundwater eastward through the Biscayne Aquifer toward the coastal well zones. This Everglades-recharged fresh water fraction, having shorter contact time with carbonate formation rock before pumping, contributes a lower mineral load than the deeper, longer-residence zones. MDWASD's northern wellfields consistently show lower hardness than central or southern Miami-Dade wellfields.

With hardness at 88 mg/L, Miami Gardens residents experience light to moderate scale challenges. Faucet aerators and showerheads develop deposits slowly — bi-monthly cleaning with citric acid solution is sufficient. Dishwashers produce clean glassware with moderate rinse-aid. Miami-Dade Water and Sewer Department consistently delivers water meeting all Florida DEP and EPA Safe Drinking Water Act requirements.