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City water profile

Plymouth water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Plymouth, Minnesota.

Median indexed hardness

325PPM

4 indexed ZIPs

Range 324.5–324.5 PPM

State comparison
7 PPM above
State hardness rank
#94 of 250
Matched utilities
1
Active health records
0

City summary

What the indexed records say

Plymouth has 4 published ZIP profiles across Hennepin County. The indexed median is 325 PPM, compared with 318 PPM across Minnesota.

Among the 250 Minnesotacities with an indexed median, Plymouth ranks #94from highest to lowest. Across all 321 state ZIP profiles, available estimates run from 46.1to 716 PPM.

The 324.5–324.5 PPM range shows how much the available ZIP estimates vary within the city label.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs
Moderately hard0 ZIPs
Hard0 ZIPs
Very hard4 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
6.4 miles
Profiles with evidence
4/4

Confidence labels

High: 0Moderate: 4Low: 0

Observation window: May 10, 2016 to Aug 30, 2018.

ZIP directory

Water reports in Plymouth

Open a ZIP for site-level provenance and measurements.

ZIP code

55441

Very Hard

324.5 PPM

Nearest site
4.8 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

55442

Very Hard

324.5 PPM

Nearest site
3.4 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

55446

Very Hard

324.5 PPM

Nearest site
6.4 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

55447

Very Hard

324.5 PPM

Nearest site
7.4 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Plymouth

PWSID MN1270044

Groundwater
System population served
76,546
Last reported
May 28, 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 Plymouth

Is the water hard?

The indexed city median is 325 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.