Hardness
Very Hard
290.5 PPM · 17 GPG
Local water dashboard
Official source aggregationWater quality in Stuart, FL 34994
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.
5 active health-based violations
- Primary matched system
- Stuart, City Of - Water Plant
- Source water
- Groundwater
- County
- Martin County
- Profile updated
At a glance
What the current records say
EPA quarter 2026Q2
Compliance screen
Review needed
5 active health-based records
Lead 90th percentile
0.0012 mg/L
8% of action level
Utility match
7 systems
Serves 16,841 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
290.5 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
290.5
mg/L as CaCO₃ equivalent
Grains per gallon
17
1 GPG ≈ 17.1 PPM
What this means at home
At 290.5 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
74
Nearest site
1.1 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: M-657 AAH8121 (Well).USGS source documentation ↗
Regional context
Is 34994 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Stuart median
291 PPM
About the same1 indexed ZIP readings · Range 290.5–290.5 PPM
Florida median
280 PPM
11 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)
0.0012 mg/L
Reported Dec 1, 2025
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 0.0012
EPA limit 0.015
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 161
- Health-based
- 5
- Active health-based
- 5
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| E. COLI | FL4431883 | Archived | Mar 1, 2026through Mar 31, 2026 |
| Revised Total Coliform Rule | FL4431883 | Archived | Mar 1, 2026through Mar 31, 2026 |
| Revised Total Coliform Rule | FL4431883 | Archived | Oct 1, 2025through Oct 31, 2025 |
| Revised Total Coliform Rule | FL4430484 | Archived | Sep 1, 2025through Sep 30, 2025 |
| Revised Total Coliform Rule | FL4430484 | Resolved | Aug 1, 2025through Aug 31, 2025 |
| Consumer Confidence Rule | FL4430259 | Unaddressed | Jul 1, 2025 |
| Consumer Confidence Rule | FL4430484 | Resolved | Jul 1, 2025through Jan 8, 2026 |
| Revised Total Coliform Rule | FL4430484 | Resolved | May 1, 2025through May 31, 2025 |
| Revised Total Coliform Rule | FL4430259 | Unaddressed | Apr 1, 2025 |
| Revised Total Coliform Rule | FL4434014 | Resolved | Apr 1, 2025through Apr 30, 2025 |
| Revised Total Coliform Rule | FL4430484 | Resolved | Apr 1, 2025through Apr 30, 2025 |
| Revised Total Coliform Rule | FL4431883 | Resolved | Apr 1, 2025through Apr 30, 2025 |
| E. COLI | FL4431883 | Resolved | Apr 1, 2025through Apr 30, 2025 |
| E. COLI | FL4431235 | Archived | Apr 1, 2025through Apr 30, 2025 |
| Revised Total Coliform Rule | FL4431235 | Archived | Apr 1, 2025through Apr 30, 2025 |
| Revised Total Coliform Rule | FL4434014 | Resolved | Mar 1, 2025through Mar 31, 2025 |
| Revised Total Coliform Rule | FL4430484 | Resolved | Mar 1, 2025through Mar 31, 2025 |
| Revised Total Coliform Rule | FL4431235 | Archived | Mar 1, 2025through Mar 31, 2025 |
| E. COLI | FL4431235 | Archived | Mar 1, 2025through Mar 31, 2025 |
| Revised Total Coliform Rule | FL4430259 | Archived | Feb 1, 2025through Feb 28, 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 Stuart ZIP 34994 using 290.5 PPM nearby hardness and 1 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
290.5 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 systemsAffiliate 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 Stuart
Is tap water safe in Stuart?+
EPA ECHO reports 5 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 290.5 PPM, or 17 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 290.5 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.