Is tap water safe in Gwinner?

EPA SDWIS shows no active health-based violation in this profile's reporting window. That is not the same as proving every contaminant is absent, and federal data can lag state and utility records.

How hard is the water in Gwinner, ND?

Nearby USGS observations produce an estimate of 408 ppm (23.9 grains per gallon), classified as very hard. This is not a tap measurement.

Do I need a water softener in ZIP code 58040?

At 408 ppm, a correctly sized whole-house softener can reduce scale buildup and hard-water spotting. Treatment for hardness does not remove all health-related contaminants.

City water profile

Gwinner water quality

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

Median indexed hardness

398PPM

2 indexed ZIPs

Range 388–408 PPM

State comparison: 26 PPM above
State hardness rank: #72 of 210
Matched utilities: 1
Active health records: 0

City summary

What the indexed records say

Gwinner has 2 published ZIP profiles across Sargent County. The indexed median is 398 PPM, compared with 372 PPM across North Dakota.

Among the 210 North Dakotacities with an indexed median, Gwinner ranks #72from highest to lowest. Across all 226 state ZIP profiles, available estimates run from 170.5to 716 PPM.

The 388–408 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 hard2 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: 14.3 miles
Profiles with evidence: 2/2

Confidence labels

High: 0Moderate: 2Low: 0

Observation window: May 19, 2016 to May 1, 2024.

ZIP directory

Water reports in Gwinner

Open a ZIP for site-level provenance and measurements.

ZIP code

58040

Very Hard

408 PPM

Nearest site: 14.3 mi
Confidence: Moderate

View full ZIP evidence →

ZIP code

58069

Very Hard

388 PPM

Nearest site: 6.3 mi
Confidence: Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Gwinner City Of

PWSID ND4100428

Groundwater

System population served: 753
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.

No violation records are included in the current lookback window.

Practical next steps

Move from index to evidence

1. Open your ZIP. Check distance, dates, confidence, and the associated utility.
2. Read the current CCR. Confirm source water, detections, limits, ranges, and notices.
3. Test the tap when needed. Confirm health concerns or treatment sizing with the right method.

Continue comparing

Other North Dakota communities

Forman

Sargent County

398 PPM median

Milnor

Sargent County

401 PPM median

Rutland

Sargent County

398 PPM median

Nome

Barnes County

398 PPM median

Jud

Lamoure County

398 PPM median

Montpelier

Stutsman County

398 PPM median

Search all 210 North Dakota cities →

Questions people ask

About water in Gwinner

Is the water hard?

The indexed city median is 398 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.