Is tap water safe in Nashua?

EPA SDWIS shows no active health-based violation in this profile's reporting window. That is not the same as proving every contaminant is absent, and federal data can lag state and utility records.

How hard is the water in Nashua, NH?

Nearby USGS observations produce an estimate of 43.2 ppm (2.5 grains per gallon), classified as soft. This is not a tap measurement.

Do I need a water softener in ZIP code 03064?

There is no high-hardness trigger in this profile. Confirm conditions with an at-home hardness test before purchasing equipment.

City water profile

Nashua water quality

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

Median indexed hardness

42PPM

4 indexed ZIPs

Range 40.4–43.2 PPM

State comparison: 16 PPM below
State hardness rank: #62 of 74
Matched utilities: 2
Active health records: 0

City summary

What the indexed records say

Nashua has 4 published ZIP profiles across Hillsborough County. The indexed median is 42 PPM, compared with 58 PPM across New Hampshire.

Among the 74 New Hampshirecities with an indexed median, Nashua ranks #62from highest to lowest. Across all 90 state ZIP profiles, available estimates run from 16to 102 PPM.

The 40.4–43.2 PPM range shows how much the available ZIP estimates vary within the city label.

Hardness distribution

How local ZIP estimates compare

Soft4 ZIPs

Moderately hard0 ZIPs

Hard0 ZIPs

Very hard0 ZIPs

4 of 4 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance: 6.2 miles
Profiles with evidence: 4/4

Confidence labels

High: 0Moderate: 4Low: 0

Pennichuck Water Works

PWSID NH1621010

Surface water

System population served: 88,853
Last reported: Jun 23, 2026

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

Farley Rd Estates

PWSID NH1622010

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.

No violation records are included in the current lookback window.

Practical next steps

Move from index to evidence

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

Continue comparing

Other New Hampshire communities

Amherst

Hillsborough County

79 PPM median

Antrim

Hillsborough County

86 PPM median

Bennington

Hillsborough County

85 PPM median

Francestown

Hillsborough County

83 PPM median

Goffstown

Hillsborough County

58 PPM median

Greenville

Hillsborough County

42 PPM median

Search all 74 New Hampshire cities →

Questions people ask

About water in Nashua

Is the water hard?

The indexed city median is 42 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.