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City water profile

Plaza water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Plaza, North Dakota.

Median indexed hardness

460PPM

One indexed ZIP

Range 460–460 PPM

State comparison
88 PPM above
State hardness rank
#34 of 210
Matched utilities
1
Active health records
0

City summary

What the indexed records say

Plaza has 1 published ZIP profile across Mountrail County. The indexed median is 460 PPM, compared with 372 PPM across North Dakota.

Among the 210 North Dakotacities with an indexed median, Plaza ranks #34from highest to lowest. Across all 226 state ZIP profiles, available estimates run from 170.5to 716 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 hard0 ZIPs
Hard0 ZIPs
Very hard1 ZIP

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
7.8 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 1Low: 0

Observation window: Jan 26, 2016 to Feb 5, 2026.

ZIP directory

Water reports in Plaza

Open a ZIP for site-level provenance and measurements.

ZIP code

58771

Very Hard

460 PPM

Nearest site
7.8 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Plaza City Of

PWSID ND3100798

Surface water
System population served
171
Last reported
Jun 29, 2026

The system names this served city; Census place overlap links the city to this 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
ChloramineND3100798Oct 1, 2022Resolved
Consumer Confidence RuleND3100798Oct 2, 2017Unaddressed
Consumer Confidence RuleND3100798Oct 2, 2016Unaddressed
Consumer Confidence RuleND3100798Oct 2, 2015Unaddressed
Consumer Confidence RuleND3100798Oct 2, 2014Unaddressed

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 Plaza

Is the water hard?

The indexed city median is 460 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.