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City water profile

Grandfield water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Grandfield, Oklahoma.

Median indexed hardness

206PPM

One indexed ZIP

Range 206–206 PPM

State comparison
20 PPM below
State hardness rank
#70 of 108
Matched utilities
1
Active health records
0

City summary

What the indexed records say

Grandfield has 1 published ZIP profile across Tillman County. The indexed median is 206 PPM, compared with 226 PPM across Oklahoma.

Among the 108 Oklahomacities with an indexed median, Grandfield ranks #70from highest to lowest. Across all 148 state ZIP profiles, available estimates run from 7to 610 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
22.9 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 1Low: 0

Observation window: Jan 20, 2016 to Jun 3, 2026.

ZIP directory

Water reports in Grandfield

Open a ZIP for site-level provenance and measurements.

ZIP code

73546

Very Hard

206 PPM

Nearest site
22.9 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Grandfield

PWSID OK2007103

Surface water
System population served
1,110
Last reported
May 13, 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
Nitrate-NitriteOK2007103Jan 1, 2026Archived · health-based
Nitrate-NitriteOK2007103Oct 1, 2025Archived · health-based
Nitrate-NitriteOK2007103Jul 1, 2025Archived · health-based
Nitrate-NitriteOK2007103Apr 1, 2025Archived · health-based
Nitrate-NitriteOK2007103Jan 1, 2025Archived · health-based
Nitrate-NitriteOK2007103Oct 1, 2024Archived · health-based
Nitrate-NitriteOK2007103Jul 1, 2024Archived · health-based
Nitrate-NitriteOK2007103Apr 1, 2024Archived · health-based
TTHMOK2007103Jan 1, 2024Archived · health-based
TTHMOK2007103Dec 30, 2023Resolved

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 Grandfield

Is the water hard?

The indexed city median is 206 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.