Hardness
Soft
49.1 PPM · 2.9 GPG
Local water dashboard
Official source aggregationWater quality in Londonderry, NH 03053
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Rockingham County.
2 reported benchmark flags
- Primary matched system
- Londonderry
- Source water
- Surface water + Groundwater
- County
- Rockingham 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
0 mg/L
0% of action level
Utility match
10 systems
Serves 6,255 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
49.1 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
49.1
mg/L as CaCO₃ equivalent
Grains per gallon
2.9
1 GPG ≈ 17.1 PPM
What this means at home
At 49.1 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
96
Nearest site
6.2 mi
Observation range
Jan 4, 2016–Jun 8, 2026
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: BEAVER BROOK AT NORTH PELHAM, NH (Stream).USGS source documentation ↗
Regional context
Is 03053 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Londonderry median
49 PPM
About the same1 indexed ZIP readings · Range 49.1–49.1 PPM
New Hampshire median
58 PPM
9 PPM lower90 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.
1 pass2 fail
Lead (PB90)
0 mg/L
Reported Dec 31, 2024
Copper (CU90)
3.77 mg/L
Reported Jun 30, 2009
Numerical coverage
3 comparable results
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 0
EPA limit 0.015
Copper (90th percentile)
Measured in mg/L
Local 3.77
EPA limit 1.3
Combined Radium (-226 and -228)
Measured in PCI/L
Local 5.8
EPA limit 5
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 32
- Health-based
- 2
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Lead and Copper Rule | NH1393060 | Resolved | Oct 1, 2024through Oct 16, 2024 |
| Groundwater RuleHealth-based | NH1392050 | Resolved | Jan 2, 2024through Jul 15, 2024 |
| Combined Radium (-226 and -228)Health-basedReported 5.8 PCI/L · MCL 5 | NH1392050 | Resolved | Jan 1, 2022through Mar 31, 2022 |
| Lead and Copper Rule | NH1393060 | Resolved | Oct 1, 2021through Oct 13, 2021 |
| Revised Total Coliform Rule | NH1392050 | Resolved | Aug 9, 2021through Aug 17, 2021 |
| Revised Total Coliform Rule | NH1392050 | Resolved | Apr 1, 2021through May 1, 2021 |
| Revised Total Coliform Rule | NH1392050 | Resolved | Apr 1, 2021through Jun 15, 2021 |
| Public Notice | NH1392320 | Unaddressed | Feb 21, 2019 |
| Public Notice | NH1392320 | Unaddressed | Feb 21, 2019 |
| Public Notice | NH1392320 | Unaddressed | Feb 21, 2019 |
| Public Notice | NH1392320 | Unaddressed | Feb 21, 2019 |
| Public Notice | NH1392320 | Unaddressed | Feb 21, 2019 |
| Public Notice | NH1392320 | Unaddressed | Feb 21, 2019 |
| Public Notice | NH1392320 | Unaddressed | Feb 21, 2019 |
| Public Notice | NH1392320 | Unaddressed | Feb 21, 2019 |
| Public Notice | NH1392320 | Unaddressed | Feb 21, 2019 |
| Public Notice | NH1392320 | Unaddressed | Feb 21, 2019 |
| Public Notice | NH1392320 | Unaddressed | Feb 21, 2019 |
| Public Notice | NH1392320 | Unaddressed | Feb 21, 2019 |
| Public Notice | NH1392320 | Unaddressed | Feb 21, 2019 |
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 Londonderry ZIP 03053 using 49.1 PPM nearby hardness and 3 reported measurement benchmarks.
Drinking water protection
Under-Sink Reverse Osmosis System
Copper (90th percentile), Combined Radium (-226 and -228) have 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 Londonderry
Is tap water safe in Londonderry?+
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 49.1 PPM, or 2.9 grains per gallon, classified as soft. 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.