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City water profile

Hopkinton water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Hopkinton, Massachusetts.

Median indexed hardness

66PPM

One indexed ZIP

Range 66.1–66.1 PPM

State comparison
17 PPM above
State hardness rank
#92 of 302
Matched utilities
6
Active health records
0

City summary

What the indexed records say

Hopkinton has 1 published ZIP profile across Middlesex County. The indexed median is 66 PPM, compared with 49 PPM across Massachusetts.

Among the 302 Massachusettscities with an indexed median, Hopkinton ranks #92from highest to lowest. Across all 328 state ZIP profiles, available estimates run from 24.3to 128 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

Soft0 ZIPs
Moderately hard1 ZIP
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
5 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 1Low: 0

Observation window: Jan 13, 2016 to Nov 21, 2025.

ZIP directory

Water reports in Hopkinton

Open a ZIP for site-level provenance and measurements.

ZIP code

01748

Moderately Hard

66.1 PPM

Nearest site
5 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Hopkinton Water Department

PWSID MA2139000

Groundwater
System population served
12,680
Last reported
Jun 22, 2026

EPA SDWIS explicitly lists this ZIP in the system's served geography.

Deerfield Estates

PWSID MA2139006

Groundwater
System population served
100
Last reported
Jun 22, 2026

EPA SDWIS explicitly lists this ZIP in the system's served geography.

Estates At Highland Ridge

PWSID MA2139010

Groundwater
System population served
100
Last reported
Jun 22, 2026

EPA SDWIS explicitly lists this ZIP in the system's served geography.

The Preserve At Hopkinton Condo

PWSID MA2139008

Groundwater
System population served
80
Last reported
Jun 22, 2026

EPA SDWIS explicitly lists this ZIP in the system's served geography.

Maillet Woods Condominiums

PWSID MA2139011

Groundwater
System population served
55
Last reported
Jun 22, 2026

EPA SDWIS explicitly lists this ZIP in the system's served geography.

Village At Highland Park

PWSID MA2139007

Groundwater
System population served
50
Last reported
Jun 22, 2026

EPA SDWIS explicitly lists this ZIP in the system's served geography.

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
Revised Total Coliform RuleMA2139008Sep 1, 2022Resolved · 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 Hopkinton

Is the water hard?

The indexed city median is 66 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.