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City water profile

Bolton water quality

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

Median indexed hardness

78PPM

One indexed ZIP

Range 78–78 PPM

State comparison
29 PPM above
State hardness rank
#63 of 302
Matched utilities
5
Active health records
0

City summary

What the indexed records say

Bolton has 1 published ZIP profile across Worcester County. The indexed median is 78 PPM, compared with 49 PPM across Massachusetts.

Among the 302 Massachusettscities with an indexed median, Bolton ranks #63from 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
8.1 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 Bolton

Open a ZIP for site-level provenance and measurements.

ZIP code

01740

Moderately Hard

78 PPM

Nearest site
8.1 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Bolton Office Park Alta Nashoba Valley

PWSID MA2034019

Groundwater
System population served
788
Last reported
Jun 22, 2026

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

Regency At Bolton Condominiums

PWSID MA2034030

Groundwater
System population served
148
Last reported
Jun 22, 2026

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

Century Mill Estates

PWSID MA2034031

Groundwater
System population served
135
Last reported
Jun 22, 2026

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

Bolton Country Manor

PWSID MA2034027

Groundwater
System population served
60
Last reported
Jun 22, 2026

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

Sunset Ridge Condominiums

PWSID MA2034028

Groundwater
System population served
42
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 RuleMA2034031Feb 1, 2026Resolved
Lead and Copper RuleMA2034027Jul 1, 2020Unaddressed

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 Bolton

Is the water hard?

The indexed city median is 78 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.