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City water profile

Nogales water quality

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

Median indexed hardness

245PPM

One indexed ZIP

Range 245–245 PPM

State comparison
4 PPM above
State hardness rank
#71 of 133
Matched utilities
5
Active health records
0

City summary

What the indexed records say

Nogales has 1 published ZIP profile across Santa Cruz County. The indexed median is 245 PPM, compared with 241 PPM across Arizona.

Among the 133 Arizonacities with an indexed median, Nogales ranks #71from 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
36.3 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 0Low: 1

Observation window: Jan 11, 2016 to Mar 31, 2026.

ZIP directory

Water reports in Nogales

Open a ZIP for site-level provenance and measurements.

ZIP code

85621

Very Hard

245 PPM

Nearest site
36.3 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

Nogales City Of

PWSID AZ0412004

Groundwater
System population served
22,000
Last reported
May 14, 2026

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

Valle Verde Water Company - East

PWSID AZ0412009

Groundwater
System population served
2,331
Last reported
May 14, 2026

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

Town & Country - Preston

PWSID AZ0412311

Groundwater
System population served
430
Last reported
May 14, 2026

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

The Grand Acres

PWSID AZ0412305

Groundwater
System population served
153
Last reported
May 14, 2026

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

Kino Ranch 2

PWSID AZ0412015

Groundwater
System population served
109
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
ChlorineAZ0412311Nov 1, 2025Archived
ChlorineAZ0412305Nov 1, 2025Resolved
Public NoticeAZ0412009Oct 19, 2025Resolved
Public NoticeAZ0412009Oct 18, 2025Resolved
Public NoticeAZ0412311Oct 17, 2025Unaddressed
Consumer Confidence RuleAZ0412311Oct 2, 2025Unaddressed
ArsenicAZ0412004Oct 1, 2025Archived
ChlorineAZ0412311Oct 1, 2025Archived
Lead and Copper RuleAZ0412311Oct 1, 2025Unaddressed
Lead and Copper RuleAZ0412305Oct 1, 2025Unaddressed

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 Nogales

Is the water hard?

The indexed city median is 245 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.