Hardness
Soft
57 PPM · 3.3 GPG
Local water dashboard
Official source aggregationWater quality in Loudon, NH 03307
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Merrimack County.
2 reported benchmark flags
- Primary matched system
- Freedom Hill/pine Ridge Est
- Source water
- Groundwater
- County
- Merrimack 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
0.031 mg/L
207% of action level
Utility match
7 systems
Serves 370 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
57 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
57
mg/L as CaCO₃ equivalent
Grains per gallon
3.3
1 GPG ≈ 17.1 PPM
What this means at home
At 57 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
62
Nearest site
1.9 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-LSW 246 (Well).USGS source documentation ↗
Regional context
Is 03307 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Loudon median
57 PPM
About the same1 indexed ZIP readings · Range 57–57 PPM
New Hampshire median
58 PPM
About the same90 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 pass2 fail
Lead (PB90)
0.031 mg/L
Reported Dec 31, 2009
Copper (CU90)
Not available
No numerical 90th-percentile result
Numerical coverage
2 comparable results
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 0.031
EPA limit 0.015
Arsenic
Measured in MG/L
Local 0.0129
EPA limit 0.01
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 86
- Health-based
- 10
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Arsenic | NH1403020 | Resolved | Jan 1, 2024through Mar 31, 2024 |
| Revised Total Coliform Rule | NH1403010 | Resolved | Nov 8, 2023through Nov 27, 2023 |
| ArsenicHealth-basedReported 0.0129 MG/L · MCL 0.01 | NH1403030 | Resolved | Oct 1, 2023through Dec 31, 2023 |
| Public Notice | NH1403030 | Resolved | Sep 17, 2023through Sep 20, 2023 |
| Public Notice | NH1403030 | Resolved | Aug 23, 2023through Sep 12, 2023 |
| ArsenicHealth-basedReported 0.017 MG/L · MCL 0.01 | NH1403030 | Resolved | Jul 1, 2023through Sep 30, 2023 |
| Groundwater RuleHealth-based | NH1403030 | Resolved | Jul 1, 2023through Oct 30, 2023 |
| Arsenic | NH1403020 | Resolved | Jul 1, 2023through Sep 30, 2023 |
| ArsenicHealth-basedReported 0.0217 MG/L · MCL 0.01 | NH1403030 | Resolved | Apr 1, 2023through Jun 30, 2023 |
| ArsenicHealth-basedReported 0.0085 MG/L · MCL 0.01 | NH1403020 | Archived | Apr 1, 2023through Jun 30, 2023 |
| Public Notice | NH1402010 | Resolved | Mar 7, 2023through Mar 31, 2023 |
| Public Notice | NH1402010 | Unaddressed | Mar 7, 2023 |
| Public Notice | NH1402010 | Unaddressed | Mar 7, 2023 |
| Public Notice | NH1402010 | Unaddressed | Mar 7, 2023 |
| Public Notice | NH1402010 | Unaddressed | Mar 7, 2023 |
| Public Notice | NH1402010 | Unaddressed | Mar 7, 2023 |
| Public Notice | NH1402010 | Unaddressed | Mar 7, 2023 |
| Public Notice | NH1402010 | Unaddressed | Mar 7, 2023 |
| Public Notice | NH1402010 | Unaddressed | Mar 7, 2023 |
| Public Notice | NH1402010 | Unaddressed | Mar 7, 2023 |
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 Loudon ZIP 03307 using 57 PPM nearby hardness and 2 reported measurement benchmarks.
Drinking water protection
Under-Sink Reverse Osmosis System
Lead (90th percentile), Arsenic 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 Loudon
Is tap water safe in Loudon?+
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 57 PPM, or 3.3 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.