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City water profile

Alton water quality

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

Median indexed hardness

50PPM

2 indexed ZIPs

Range 49.7–50.5 PPM

State comparison
8 PPM below
State hardness rank
#47 of 74
Matched utilities
4
Active health records
0

City summary

What the indexed records say

Alton has 2 published ZIP profiles across Belknap County. The indexed median is 50 PPM, compared with 58 PPM across New Hampshire.

Among the 74 New Hampshirecities with an indexed median, Alton ranks #47from highest to lowest. Across all 90 state ZIP profiles, available estimates run from 16to 102 PPM.

The 49.7–50.5 PPM range shows how much the available ZIP estimates vary within the city label.

Hardness distribution

How local ZIP estimates compare

Soft2 ZIPs
Moderately hard0 ZIPs
Hard0 ZIPs
Very hard0 ZIPs

2 of 2 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
12.7 miles
Profiles with evidence
2/2

Confidence labels

High: 0Moderate: 2Low: 0

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

ZIP directory

Water reports in Alton

Open a ZIP for site-level provenance and measurements.

ZIP code

03809

Soft

49.7 PPM

Nearest site
9.6 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

03810

Soft

50.5 PPM

Nearest site
12.7 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Alton Water Works

PWSID NH0061010

Groundwater
System population served
1,800
Last reported
Jun 23, 2026

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

Merrymeeting Mhp

PWSID NH0063020

Groundwater
System population served
265
Last reported
Jun 23, 2026

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

Eagles Rest Mhp

PWSID NH0062010

Groundwater
System population served
138
Last reported
Jun 23, 2026

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

Lakeside At Winnipesaukee

PWSID NH0062050

Groundwater
System population served
85
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
Lead and Copper RuleNH0061010Mar 31, 2026Unaddressed
Public NoticeNH0062050Mar 7, 2023Resolved
Public NoticeNH0062050Mar 7, 2023Resolved
ArsenicNH0062050Oct 1, 2022Resolved
NitrateNH0062050Jan 1, 2022Resolved
ArsenicNH0062050Oct 1, 2021Resolved
Consumer Confidence RuleNH0062050Jul 1, 2021Resolved
NitrateNH0062050Jan 1, 2021Resolved
Combined UraniumNH0062050Jan 1, 2021Resolved
cis-1,2-DichloroethyleneNH0062050Jan 1, 2021Resolved

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 Alton

Is the water hard?

The indexed city median is 50 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.