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City water profile

Duncan water quality

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

Median indexed hardness

156PPM

One indexed ZIP

Range 155.5–155.5 PPM

State comparison
85 PPM below
State hardness rank
#120 of 133
Matched utilities
2
Active health records
0

City summary

What the indexed records say

Duncan has 1 published ZIP profile across Greenlee County. The indexed median is 156 PPM, compared with 241 PPM across Arizona.

Among the 133 Arizonacities with an indexed median, Duncan ranks #120from 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.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs
Moderately hard0 ZIPs
Hard1 ZIP
Very hard0 ZIPs

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
18.6 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 1Low: 0

Observation window: Mar 30, 2016 to Apr 8, 2026.

ZIP directory

Water reports in Duncan

Open a ZIP for site-level provenance and measurements.

ZIP code

85534

Hard

155.5 PPM

Nearest site
18.6 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Duncan Town Of

PWSID AZ0406001

Groundwater
System population served
605
Last reported
May 14, 2026

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

Valley View Mhc & Rv Park

PWSID AZ0406305

Groundwater
System population served
142
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 RuleAZ0406305Feb 1, 2026Archived
Di(2-ethylhexyl) phthalateAZ0406001Jan 1, 2026Archived
Revised Total Coliform RuleAZ0406305Jan 1, 2026Archived
Lead and Copper RuleAZ0406305Jan 1, 2026Resolved
Revised Total Coliform RuleAZ0406305Dec 1, 2025Archived
Revised Total Coliform RuleAZ0406305Nov 1, 2025Resolved
Public NoticeAZ0406001Oct 2, 2025Resolved
Consumer Confidence RuleAZ0406305Oct 2, 2025Unaddressed
Lead and Copper RuleAZ0406305Oct 1, 2025Resolved
Revised Total Coliform RuleAZ0406305Sep 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 Duncan

Is the water hard?

The indexed city median is 156 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.