Hardness
Very Hard
288 PPM · 16.8 GPG
Local water dashboard
Official source aggregationWater quality in Hobe Sound, FL 33455
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Martin County.
3 active health-based violations
- Primary matched system
- South Martin Regional Utilities
- Source water
- Groundwater
- County
- Martin County
- Profile updated
At a glance
What the current records say
EPA quarter 2026Q2
Compliance screen
Review needed
3 active health-based records
Lead 90th percentile
3.0e-4 mg/L
2% of action level
Utility match
4 systems
Serves 27,000 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
288 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
288
mg/L as CaCO₃ equivalent
Grains per gallon
16.8
1 GPG ≈ 17.1 PPM
What this means at home
At 288 PPM, mineral scale can build up on fixtures and heating elements, reduce soap lather, and leave visible spotting. Hardness is primarily an aesthetic and appliance concern—not itself a tap-water safety rating.
USGS sites used
87
Nearest site
8.3 mi
Observation range
Jun 20, 2016–Jan 27, 2026
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: Martin North SA Well 3 (Well).USGS source documentation ↗
Regional context
Is 33455 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Hobe Sound median
288 PPM
About the same1 indexed ZIP readings · Range 288–288 PPM
Florida median
280 PPM
8 PPM higher602 indexed ZIP readings · Range 20–374.5 PPM
EPA benchmark screen
Contaminant snapshot
Available numerical results from associated SDWIS community water systems, compared with the applicable action level or federal MCL. Federal measured-value coverage is incomplete.
1 pass
Lead (PB90)
3.0e-4 mg/L
Reported Dec 1, 2024
Copper (CU90)
Not available
No numerical 90th-percentile result
Numerical coverage
1 comparable result
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 3.0e-4
EPA limit 0.015
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 94
- Health-based
- 3
- Active health-based
- 3
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Revised Total Coliform Rule | FL4431456 | Archived | Feb 1, 2026through Feb 28, 2026 |
| E. COLI | FL4431456 | Archived | Feb 1, 2026through Feb 28, 2026 |
| E. COLI | FL4431456 | Resolved | Oct 1, 2025through Feb 27, 2026 |
| E. COLI | FL4431456 | Resolved | Aug 1, 2025through Mar 3, 2026 |
| Consumer Confidence Rule | FL4431456 | Resolved | Jul 1, 2025through Mar 3, 2026 |
| LEAD AND COPPER RULE REVISIONSHealth-based | FL4431456 | Unaddressed | Feb 1, 2025 |
| E. COLI | FL4431456 | Resolved | Feb 1, 2025through Sep 25, 2025 |
| LEAD AND COPPER RULE REVISIONS | FL4431456 | Unaddressed | Feb 1, 2025 |
| LEAD AND COPPER RULE REVISIONS | FL4430774 | Unaddressed | Feb 1, 2025 |
| LEAD AND COPPER RULE REVISIONSHealth-based | FL4430774 | Unaddressed | Feb 1, 2025 |
| LEAD AND COPPER RULE REVISIONSHealth-based | FL4431582 | Unaddressed | Feb 1, 2025 |
| LEAD AND COPPER RULE REVISIONS | FL4431582 | Unaddressed | Feb 1, 2025 |
| Revised Total Coliform Rule | FL4430624 | Resolved | Jan 1, 2025through Jan 31, 2025 |
| E. COLI | FL4430624 | Resolved | Jan 1, 2025through Jan 31, 2025 |
| Revised Total Coliform Rule | FL4431456 | Resolved | Jan 1, 2025through Jan 31, 2025 |
| E. COLI | FL4431456 | Resolved | Jan 1, 2025through Jan 31, 2025 |
| Revised Total Coliform Rule | FL4430774 | Archived | Jan 1, 2025through Jan 31, 2025 |
| E. COLI | FL4430774 | Archived | Jan 1, 2025through Jan 31, 2025 |
| Revised Total Coliform Rule | FL4431582 | Resolved | Jan 1, 2025through Jan 31, 2025 |
| E. COLI | FL4431582 | Resolved | Jan 1, 2025through Jan 31, 2025 |
No reported violation does not prove that every contaminant was tested or absent; SDWIS measured values are incomplete and lag state records.
Solutions matcher
Your personalized water action plan
Matched to Hobe Sound ZIP 33455 using 288 PPM nearby hardness and 1 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
288 PPM is 2× the high-hardness trigger used by this matcher.
Designed to reduce scale on fixtures, water heaters, glassware, and plumbing throughout the home.
Compare whole-house systemsDrinking water protection
Under-Sink Reverse Osmosis System
LEAD AND COPPER RULE REVISIONS has a measured benchmark flag or active health-based SDWIS record in this profile.
A certified multi-stage RO system targets a broader range of dissolved contaminants at the kitchen tap.
Explore under-sink filtrationAffiliate disclosure: we may earn a commission from qualifying purchases, at no added cost to you. Product matching is educational and does not replace certified water testing.
Frequently asked
Water questions for Hobe Sound
Is tap water safe in Hobe Sound?+
EPA ECHO reports 3 active health-based violations among the associated community water systems. Review the affected utility's current notice and Consumer Confidence Report.
How hard is the water?+
Nearby USGS observations produce an estimate of 288 PPM, or 16.8 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 288 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.