Coconut Grove Water Hardness & Quality Report (2026)
Water Hardness
6.3 grains per gallon
Source
groundwater
pH Level
7.6
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
255.3 mg/L
Est. Daily Cost
$0.29
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 Coconut Grove, your appliances are currently losing 14% efficiency due to mineral buildup.
| Appliance | In Coconut Grove | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.1 yrs | 8.5 yrs | -28% |
| Washing Machine | 9.6 yrs | 12 yrs | -20% |
| Water Heater | 11.3 yrs | 15 yrs | -25% |
Regional Water Comparison
How Coconut Grove compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Coconut Grove, Florida | 107.5 mg/L | 6 ppt | 🟡 Moderately Hard | groundwater |
| Coral Gables, Florida | 149 mg/L | 7.3 ppt | 🟠 Hard | groundwater |
| Coral Terrace, Florida | 154 mg/L | 7.4 ppt | 🟠 Hard | groundwater |
| Little Havana, Florida | 185.5 mg/L | 8.4 ppt | 🔴 Very Hard | groundwater |
| Pinecrest, Florida | 273.5 mg/L | 11.2 ppt | 🔴 Very Hard | groundwater |
National Benchmark
How Coconut Grove compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Coconut Grove | 107.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Coconut Grove's Water Unique?
Local geology and source profile
Coconut Grove, Florida, in Miami-Dade County — Miami's oldest continuously inhabited neighborhood, known for its bohemian character, lush tropical vegetation, and bayfront location on Biscayne Bay — receives its municipal water from Miami-Dade Water and Sewer (WASD), which draws from the Biscayne Aquifer through the Miami-Dade wellfield system in western Miami-Dade County.
The moderately hard 107.5 mg/L hardness and TDS of 255.3 mg/L reflect the Biscayne Aquifer's Pleistocene oolitic limestone character. The Biscayne Aquifer — the sole-source drinking water aquifer for Miami-Dade, Broward, and Palm Beach Counties — accesses the Pleistocene Miami Limestone (oolitic grainstone, extremely porous) and the Fort Thompson Formation (freshwater limestone, marl, and calcarenite). This unique surficial limestone, deposited in warm Pleistocene shallow-marine and freshwater environments, has high porosity and permeability but moderate calcium carbonate dissolution, producing the moderately hard water characteristic of the South Florida metropolitan water supply.
At 107.5 mg/L, Coconut Grove's water is moderately hard — scale builds in kettles and appliances over months, dishwashers benefit from rinse aid, and faucet aerators need periodic cleaning. Quarterly descaling is appropriate. The PFAS level of 6.0 ppt warrants a certified drinking water filter — the Homestead Air Reserve Base (Miami-Dade County — a major AFFF user in the South Florida military corridor), Miami International Airport, and the Miami-Dade urban-industrial PFAS complex contribute to the Coconut Grove supply's PFAS readings.
Geology & Source: Coconut Grove in Miami-Dade County is served by Miami-Dade Water and Sewer treating the Biscayne Aquifer — the Biscayne Aquifer accesses Pleistocene Miami Limestone and Fort Thompson Formation (oolitic limestone and calcarenite) beneath the South Florida coastal plain — Pleistocene oolitic limestone aquifer produces moderately hard water at 107.5 mg/L with TDS 255 mg/L in this Miami-Dade County Florida neighborhood.