Miami Beach Water Hardness & Quality Report (2026)
Water Hardness
5 grains per gallon
Source
groundwater
pH Level
7.5
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
194.4 mg/L
Est. Daily Cost
$0.23
energy & soap waste
Source: USGS Water Quality Portal · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Miami Beach, your appliances are currently losing 11% efficiency due to mineral buildup.
| Appliance | In Miami Beach | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.8 yrs | 8.5 yrs | -20% |
| Washing Machine | 10.4 yrs | 12 yrs | -13% |
| Water Heater | 12.2 yrs | 15 yrs | -19% |
Regional Water Comparison
How Miami Beach compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Miami Beach, Florida | 85.5 mg/L | 5.3 ppt | 🟡 Moderately Hard | groundwater |
| Miami, Florida | 137 mg/L | 6.9 ppt | 🟠 Hard | groundwater |
| Allapattah, Florida | 318 mg/L | 12.6 ppt | 🔴 Very Hard | groundwater |
| Key Biscayne, Florida | 267.5 mg/L | 11 ppt | 🔴 Very Hard | groundwater |
| Little Havana, Florida | 185.5 mg/L | 8.4 ppt | 🔴 Very Hard | groundwater |
National Benchmark
How Miami Beach compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Miami Beach | 85.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Miami Beach's Water Unique?
Local geology and source profile
Miami Beach, Florida, on the barrier island east of Miami across Biscayne Bay, receives its municipal water supply from the Miami-Dade Water and Sewer Department (WASD) — the same regional infrastructure serving all of Miami-Dade County. WASD sources from the Biscayne Aquifer via multiple wellfield systems throughout Miami-Dade County, and treats water at the Hialeah, Preston B. Bird, and John E. Preston water treatment plants. Notably, Miami-Dade WASD operates one of the largest lime softening water treatment programs in the United States, significantly reducing the natural Biscayne Aquifer hardness. Water hardness in Miami Beach measures 85.5 mg/L — classified as moderately soft.
Miami Beach's surprisingly soft reading — given the Biscayne Aquifer's natural hardness of 200–300+ mg/L — reflects Miami-Dade WASD's extensive lime softening treatment at its regional water treatment plants. Miami-Dade County deliberately treats the raw Biscayne Aquifer water with lime to precipitate and remove calcium carbonate before distribution, significantly lowering the finished water hardness from the aquifer's natural 250–350 mg/L range to approximately 80–120 mg/L. This treatment-driven softening is one of the defining characteristics of Miami-Dade water compared to Broward County systems (which largely deliver untreated or minimally treated Biscayne water at full hardness).
With hardness at 85.5 mg/L, Miami Beach residents experience minimal to moderate scale accumulation — dramatically less than neighboring Broward County cities despite using the same aquifer. Faucet aerators and showerheads develop deposits slowly. Miami-Dade WASD consistently delivers water meeting all Florida DEP and EPA Safe Drinking Water Act requirements.
Geology & Source: Groundwater from the Biscayne Aquifer via the Miami-Dade Water and Sewer Department (WASD) — the same Miami Limestone, Fort Thompson Formation carbonate aquifer as the Miami mainland, delivered to Miami Beach via the Biscayne Bay causeway water mains; Miami-Dade's treatment blending produces very soft results at 85.5 mg/L despite the carbonate aquifer source.