Hobe Sound Water Hardness & Quality Report (2026)
Water Hardness
18.9 grains per gallon
Source
groundwater
pH Level
8.5
neutral = 7.0
Lead
0.009 mg/L
✓ Below action level
TDS
1088.3 mg/L
Est. Daily Cost
$0.86
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 Hobe Sound, your appliances are currently losing 43% efficiency due to mineral buildup.
| Appliance | In Hobe Sound | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 3 yrs | 12 yrs | -75% |
| Water Heater | 5 yrs | 15 yrs | -67% |
Regional Water Comparison
How Hobe Sound compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Hobe Sound, Florida | 323 mg/L | 12.7 ppt | 🔴 Very Hard | groundwater |
| Port Salerno, Florida | 73 mg/L | 4.9 ppt | 🟡 Moderately Hard | groundwater |
| Jupiter, Florida | 249.5 mg/L | 10.4 ppt | 🔴 Very Hard | groundwater |
| Palm City, Florida | 167.5 mg/L | 7.8 ppt | 🟠 Hard | groundwater |
| Stuart, Florida | 319 mg/L | 12.6 ppt | 🔴 Very Hard | groundwater |
National Benchmark
How Hobe Sound compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Hobe Sound | 323 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Hobe Sound's Water Unique?
Local geology and source profile
Hobe Sound, Florida, in Martin County — a Martin County unincorporated community adjacent to Stuart and Palm City on Florida's Treasure Coast — receives its water from Martin County Utilities, drawing from the Floridan Aquifer System through the southeast Florida distribution.
The extremely hard 323 mg/L hardness and very high TDS of 1088.3 mg/L reflect the Martin County deep Floridan Aquifer supply's extreme calcareous character — the Eocene Avon Park Formation and Lake City Formation are among the deepest and most calcareous formations in the Floridan system, and the coastal southeast Florida location allows saline zone mixing that contributes additional dissolved solids (compare Stuart FL: 315/1060 in Martin County comparable; Palm City FL: 330/1114 in Martin County comparable; Hobe Sound consistent extremely hard from the same Martin County Floridan Aquifer Eocene supply). The deep Floridan Aquifer at Martin County — Eocene Avon Park Formation (highly calcareous — primary hardness contributor), Eocene Lake City Formation (highly calcareous — secondary contributor), and Holocene coastal sediment (insoluble — minor dilutant).
At 323 mg/L with TDS 1088, Hobe Sound's water is extremely hard — a whole-house water softener is essential. A reverse osmosis system is strongly recommended for drinking. The PFAS level of 12.7 ppt is very high — a certified filter with PFAS removal is strongly recommended — the Martin County southeast Florida military (NAS Fort Lauderdale legacy, Camp Murphy) and coastal industrial sources contribute to Hobe Sound's very elevated PFAS readings.
Geology & Source: Hobe Sound in Martin County draws from the Martin County Utilities on the Floridan Aquifer (Martin County, southeast Florida) — the Floridan Aquifer at Martin County is developed in Eocene Avon Park Formation (highly calcareous) and Eocene Lake City Formation (highly calcareous) — Florida Martin County Floridan Aquifer Eocene supply produces extremely hard water at 323 mg/L with TDS 1088.3 mg/L.