Hardness
Moderately Hard
96.3 PPM · 5.6 GPG
Local water dashboard
Official source aggregationWater quality in Marlborough, NH 03455
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Cheshire County.
1 reported benchmark flag
- Primary matched system
- Marlborough Water Works
- Source water
- Groundwater
- County
- Cheshire County
- Profile updated
At a glance
What the current records say
EPA quarter 2026Q2
Compliance screen
No active flag
0 active health-based records
Lead 90th percentile
Not reported
Check the utility CCR or tap test
Utility match
2 systems
Serves 750 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
96.3 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
96.3
mg/L as CaCO₃ equivalent
Grains per gallon
5.6
1 GPG ≈ 17.1 PPM
What this means at home
At 96.3 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
124
Nearest site
11.5 mi
Observation range
Jan 13, 2016–Sep 25, 2023
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: NH-PCW 126 (Well).USGS source documentation ↗
Regional context
Is 03455 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Marlborough median
96 PPM
About the same1 indexed ZIP readings · Range 96.3–96.3 PPM
New Hampshire median
58 PPM
38 PPM higher90 indexed ZIP readings · Range 16–102 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.
0 pass1 fail
Lead (PB90)
Not available
No numerical 90th-percentile result
Copper (CU90)
2.52 mg/L
Reported Dec 31, 1993
Numerical coverage
1 comparable result
Missing values remain blank; absence is not treated as a pass.
Copper (90th percentile)
Measured in mg/L
Local 2.52
EPA limit 1.3
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 2
- Health-based
- 0
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| TTHM | NH1482010 | Resolved | Jul 1, 2025through Oct 1, 2025 |
| Total Haloacetic Acids (HAA5) | NH1482010 | Resolved | Jul 1, 2025through Oct 1, 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 Marlborough ZIP 03455 using 96.3 PPM nearby hardness and 1 reported measurement benchmarks.
Drinking water protection
Under-Sink Reverse Osmosis System
Copper (90th percentile) 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 Marlborough
Is tap water safe in Marlborough?+
EPA ECHO shows no active health-based violation for the associated systems in this reporting snapshot. This does not prove every contaminant is absent; federal records can lag and household plumbing can change tap conditions.
How hard is the water?+
Nearby USGS observations produce an estimate of 96.3 PPM, or 5.6 grains per gallon, classified as moderately hard. This is not a household tap measurement.
Do I need a water softener?+
There is no high-hardness trigger in this profile. Confirm with a tap test before buying equipment.