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City water profile

Loudon water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Loudon, New Hampshire.

Median indexed hardness

57PPM

One indexed ZIP

Range 57–57 PPM

State comparison
1 PPM below
State hardness rank
#41 of 74
Matched utilities
7
Active health records
0

City summary

What the indexed records say

Loudon has 1 published ZIP profile across Merrimack County. The indexed median is 57 PPM, compared with 58 PPM across New Hampshire.

Among the 74 New Hampshirecities with an indexed median, Loudon ranks #41from highest to lowest. Across all 90 state ZIP profiles, available estimates run from 16to 102 PPM.

Because only one ZIP is represented, the city median and range are the same local estimate. It should not be read as multiple independent samples across the community.

Hardness distribution

How local ZIP estimates compare

Soft1 ZIP
Moderately hard0 ZIPs
Hard0 ZIPs
Very hard0 ZIPs

1 of 1 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
1.9 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 1Low: 0

Observation window: Jan 13, 2016 to Sep 25, 2023.

ZIP directory

Water reports in Loudon

Open a ZIP for site-level provenance and measurements.

ZIP code

03307

Soft

57 PPM

Nearest site
1.9 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Freedom Hill/pine Ridge Est

PWSID NH1403030

Groundwater
System population served
370
Last reported
Jun 23, 2026

The system names this served city; Census place overlap links the city to this ZCTA.

Villages At Loudon

PWSID NH1402020

Groundwater
System population served
250
Last reported
Jun 23, 2026

The system names this served city; Census place overlap links the city to this ZCTA.

Kos Manufactured Housing Cmnty

PWSID NH1403010

Groundwater
System population served
137
Last reported
Jun 23, 2026

The system names this served city; Census place overlap links the city to this ZCTA.

Presidential Pines/upper

PWSID NH1403020

Groundwater
System population served
60
Last reported
Jun 23, 2026

The system names this served city; Census place overlap links the city to this ZCTA.

Presidential Pines/lower

PWSID NH1403040

Groundwater
System population served
51
Last reported
Jun 23, 2026

The system names this served city; Census place overlap links the city to this ZCTA.

Voa/nne Senior Housing

PWSID NH1402030

Groundwater
System population served
50
Last reported
Jun 23, 2026

The system names this served city; Census place overlap links the city to this ZCTA.

Flintlock Apts

PWSID NH1402010

Groundwater
System population served
30
Last reported
Jun 23, 2026

The system names this served city; Census place overlap links the city to this ZCTA.

Compliance history

What EPA records show

No active health-based violation appears among the associated systems in the represented EPA reporting quarter. This does not mean every contaminant was tested at every tap.

RecordSystemPeriodStatus
ArsenicNH1403020Jan 1, 2024Resolved
Revised Total Coliform RuleNH1403010Nov 8, 2023Resolved
ArsenicNH1403030Oct 1, 2023Resolved · health-based
Public NoticeNH1403030Sep 17, 2023Resolved
Public NoticeNH1403030Aug 23, 2023Resolved
ArsenicNH1403030Jul 1, 2023Resolved · health-based
Groundwater RuleNH1403030Jul 1, 2023Resolved · health-based
ArsenicNH1403020Jul 1, 2023Resolved
ArsenicNH1403030Apr 1, 2023Resolved · health-based
ArsenicNH1403020Apr 1, 2023Archived · health-based

Practical next steps

Move from index to evidence

  1. 1. Open your ZIP. Check distance, dates, confidence, and the associated utility.
  2. 2. Read the current CCR. Confirm source water, detections, limits, ranges, and notices.
  3. 3. Test the tap when needed. Confirm health concerns or treatment sizing with the right method.

Questions people ask

About water in Loudon

Is the water hard?

The indexed city median is 57 PPM. Open the ZIP report to verify the distance and confidence behind that estimate.

Is the tap water safe?

Compliance history is utility-wide and cannot guarantee conditions at every tap. Check current notices and test when address-specific evidence is needed.

Do I need treatment?

Choose treatment only after confirming the problem at the property. A softener targets hardness; contaminant treatment requires a matching, verified performance claim.