How does Hobe Sound's water compare to the national average?

The USA national average is 151 mg/L. Hobe Sound (≈ 180+ mg/L) is 189 mg/L harder than average.

Hobe Sound Water Hardness & Quality Report (2026)

Water Hardness

very hard

180+ mg/L

Very Hard

estimated · not lab-verified

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

$0.91

energy & soap waste

Source: See methodology section below · Updated 2026

very hard180+ mg/LVery Hard · est.

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 45% efficiency due to mineral buildup.

Appliance	In Hobe Sound	Soft Water City	Efficiency Loss
Kettle	4.7 yrs	8.5 yrs	-45%
Washing Machine	6.6 yrs	12 yrs	-45%
Water Heater	8.3 yrs	15 yrs	-45%

Regional Water Comparison

How Hobe Sound compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Hobe Sound, Florida	≈ 180+ mg/L	75.2 ppt	🔴 Very Hard	groundwater
Port Salerno, Florida	≈ 120–179 mg/L	4.9 ppt	🟠 Hard	groundwater
Jupiter, Florida	≈ 120–179 mg/L	0 ppt	🟠 Hard	groundwater
Palm City, Florida	≈ 120–179 mg/L	7.8 ppt	🟠 Hard	groundwater
Stuart, Florida	≈ 120–179 mg/L	0 ppt	🟠 Hard	groundwater

National Benchmark

How Hobe Sound compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Hobe Sound	≈ 180+ mg/L	🔴 High
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Hobe Sound's Water Unique?

Local geology and source profile

Source: GroundwaterTDS: 1088.3 mg/LpH: 8.5

South Martin Regional Utilities draws its drinking water from the Surficial Aquifer and the deeper Floridan Aquifer, both located in Florida's coastal plain. Water is extracted directly from wells tapping these groundwater sources. While specific treatment plant names were not provided in the available reports, the utility serves approximately 27,149 residents in Hobe Sound, Florida, which is situated in Martin County. Residents can reach South Martin Regional Utilities at 772-546-2511 for more information.

The groundwater originates from permeable limestone formations like the Ocala Limestone, part of the Floridan Aquifer System. These rocks, dating back to the Eocene epoch, are rich in carbonates. As water naturally percolates through these karstified geological layers, it dissolves minerals like calcium carbonate and magnesium. This natural leaching process is what gives the water its characteristically hard quality, a common trait for supplies drawn from the Floridan Aquifer across the region.

Because the water is very hard, homeowners often contend with significant scale buildup in their plumbing systems. This can reduce water flow efficiency over time and noticeably shorten the lifespan of appliances such as water heaters, dishwashers, and washing machines. You might also notice spots on glassware or persistent soap scum in bathrooms. Regular descaling of fixtures with vinegar can help, as can using rinse agents in your dishwasher. For a comprehensive solution, installing a whole-house water softener is strongly recommended to protect your appliances and improve overall cleaning effectiveness.

Geology & Source: Surficial Aquifer and Floridan Aquifer; limestone formations; dissolution of calcium carbonate and magnesium result in hard water

Other Florida Water Reports

Port Salerno

≈ 120–179 mg/L

🟠 Hard

Jupiter

≈ 120–179 mg/L

🟠 Hard

Palm City

≈ 120–179 mg/L

🟠 Hard

Stuart

≈ 120–179 mg/L

🟠 Hard

Report an Issue

Notice an error or missing data? Help us keep this page accurate. If you spot incorrect water hardness, outdated utility info, or missing details, please let us know.

All reports are reviewed by our team. Thank you for supporting data quality!

Frequently Asked Questions

Is Hobe Sound's water safe to drink?

Yes. Hobe Sound's water meets all federal safety standards. The hardness is ≈ 180+ mg/L (Very Hard), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Hobe Sound?

At ≈ 180+ mg/L (Very Hard), Hobe Sound's water will cause significant limescale on kettles, washing machines, and water heaters. A water softener or descaler is strongly recommended to extend appliance lifespan and reduce energy bills by up to 45%.

How does Hobe Sound compare to the USA average?

The USA national average is 151 mg/L. Hobe Sound (≈ 180+ mg/L) is 189 mg/L above the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for Hobe Sound is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.

Estimated

Water Hardness

Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.

Estimated

Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.

Estimated

TDS — Total Dissolved Solids

Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.

Measured

PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances

EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.

Modelled

Lead

Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.

Calculated

Appliance Lifespan

Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.