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City water profile

Westminster water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Westminster, Maryland.

Median indexed hardness

93PPM

2 indexed ZIPs

Range 92.2–94.6 PPM

State comparison
3 PPM above
State hardness rank
#4 of 15
Matched utilities
1
Active health records
0

City summary

What the indexed records say

Westminster has 2 published ZIP profiles across Carroll County. The indexed median is 93 PPM, compared with 90 PPM across Maryland.

Among the 15 Marylandcities with an indexed median, Westminster ranks #4from highest to lowest. Across all 42 state ZIP profiles, available estimates run from 57.8to 167 PPM.

The 92.2–94.6 PPM range shows how much the available ZIP estimates vary within the city label.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs
Moderately hard2 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
6.4 miles
Profiles with evidence
2/2

Confidence labels

High: 0Moderate: 2Low: 0

Observation window: Jan 4, 2016 to Jun 17, 2026.

ZIP directory

Water reports in Westminster

Open a ZIP for site-level provenance and measurements.

ZIP code

21157

Moderately Hard

92.2 PPM

Nearest site
3.3 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

21158

Moderately Hard

94.6 PPM

Nearest site
6.4 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

City Of Westminster

PWSID MD0060015

Surface water
System population served
35,256
Last reported
May 18, 2026

A municipal system, in-state city, and served county all agree with this Census 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. 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 Westminster

Is the water hard?

The indexed city median is 93 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.