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City water profile

Prince Frederick water quality

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

Median indexed hardness

58PPM

One indexed ZIP

Range 57.8–57.8 PPM

State comparison
32 PPM below
State hardness rank
#15 of 15
Matched utilities
1
Active health records
0

City summary

What the indexed records say

Prince Frederick has 1 published ZIP profile across Calvert County. The indexed median is 58 PPM, compared with 90 PPM across Maryland.

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

Soft1 ZIP
Moderately hard0 ZIPs
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
14.4 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 1Low: 0

Observation window: Jan 6, 2016 to Sep 25, 2025.

ZIP directory

Water reports in Prince Frederick

Open a ZIP for site-level provenance and measurements.

ZIP code

20678

Soft

57.8 PPM

Nearest site
14.4 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Prince Frederick

PWSID MD0040011

Groundwater
System population served
4,371
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.

RecordSystemPeriodStatus
Radium-228MD0040011Apr 1, 2024Resolved

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 Prince Frederick

Is the water hard?

The indexed city median is 58 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.