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City water profile

Apache water quality

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

Median indexed hardness

487PPM

One indexed ZIP

Range 487–487 PPM

State comparison
261 PPM above
State hardness rank
#6 of 108
Matched utilities
1
Active health records
1

City summary

What the indexed records say

Apache has 1 published ZIP profile across Caddo County. The indexed median is 487 PPM, compared with 226 PPM across Oklahoma.

Among the 108 Oklahomacities with an indexed median, Apache ranks #6from 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. At least one estimate is marked low confidence, so observation distance and date deserve extra attention.

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
52.8 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 0Low: 1

Observation window: Aug 6, 2018 to Aug 14, 2018.

ZIP directory

Water reports in Apache

Open a ZIP for site-level provenance and measurements.

ZIP code

73006

Very Hard

487 PPM

Nearest site
52.8 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

Apache

PWSID OK2000806

Groundwater
System population served
1,521
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

1 unique active health-based record appears among associated systems. This does not mean every contaminant was tested at every tap.

RecordSystemPeriodStatus
Nitrate-NitriteOK2000806Jan 1, 2026Archived · health-based
Nitrate-NitriteOK2000806Oct 1, 2025Archived · health-based
Revised Total Coliform RuleOK2000806Apr 1, 2025Resolved
Gross Alpha, Excl. Radon and UOK2000806Apr 1, 2025Resolved
Combined UraniumOK2000806Apr 1, 2025Resolved
Combined Radium (-226 and -228)OK2000806Apr 1, 2025Resolved
Gross Beta Particle ActivityOK2000806Apr 1, 2025Resolved
Nitrate-NitriteOK2000806Jan 1, 2025Archived · health-based
LEAD AND COPPER RULE REVISIONSOK2000806Oct 17, 2024Addressed · health-based
LEAD AND COPPER RULE REVISIONSOK2000806Oct 17, 2024Addressed

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 Apache

Is the water hard?

The indexed city median is 487 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.