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City water profile

Coolidge water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Coolidge, Arizona.

Median indexed hardness

288PPM

One indexed ZIP

Range 288–288 PPM

State comparison
47 PPM above
State hardness rank
#29 of 133
Matched utilities
3
Active health records
0

City summary

What the indexed records say

Coolidge has 1 published ZIP profile across Pinal County. The indexed median is 288 PPM, compared with 241 PPM across Arizona.

Among the 133 Arizonacities with an indexed median, Coolidge ranks #29from highest to lowest. Across all 285 state ZIP profiles, available estimates run from 66.4to 1250 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
45.1 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 0Low: 1

Observation window: Jan 11, 2016 to Dec 18, 2024.

ZIP directory

Water reports in Coolidge

Open a ZIP for site-level provenance and measurements.

ZIP code

85128

Very Hard

288 PPM

Nearest site
45.1 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

Arizona Training Program

PWSID AZ0411037

Groundwater
System population served
470
Last reported
May 14, 2026

The system names this served city; Census place overlap links the city to this ZCTA.

Whispering Wind Mobile Home Park

PWSID AZ0411365

Groundwater
System population served
200
Last reported
May 14, 2026

The system names this served city; Census place overlap links the city to this ZCTA.

Signal Peak Water Company

PWSID AZ0411079

Groundwater
System population served
99
Last reported
May 14, 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
Revised Total Coliform RuleAZ0411079Mar 1, 2026Unaddressed
E. COLIAZ0411079Jan 12, 2026Resolved
Revised Total Coliform RuleAZ0411037Jan 1, 2026Resolved
Lead and Copper RuleAZ0411037Jan 1, 2026Unaddressed
ChlorineAZ0411079Jan 1, 2026Archived
Public NoticeAZ0411037Oct 18, 2025Unaddressed
Consumer Confidence RuleAZ0411037Oct 2, 2025Resolved
Consumer Confidence RuleAZ0411365Oct 2, 2025Unaddressed
Public NoticeAZ0411037Aug 28, 2025Resolved
Revised Total Coliform RuleAZ0411037Jul 1, 2025Resolved

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 Coolidge

Is the water hard?

The indexed city median is 288 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.