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City water profile

Tucson water quality

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

Median indexed hardness

245PPM

23 indexed ZIPs

Range 209.5–245.5 PPM

State comparison
4 PPM above
State hardness rank
#79 of 133
Matched utilities
10
Active health records
0

City summary

What the indexed records say

Tucson has 23 published ZIP profiles across Pima County. The indexed median is 245 PPM, compared with 241 PPM across Arizona.

Among the 133 Arizonacities with an indexed median, Tucson ranks #79from highest to lowest. Across all 285 state ZIP profiles, available estimates run from 66.4to 1250 PPM.

The 209.5–245.5 PPM range shows how much the available ZIP estimates vary within the city label.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs
Moderately hard0 ZIPs
Hard0 ZIPs
Very hard23 ZIPs

23 of 23 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
13.3 miles
Profiles with evidence
23/23

Confidence labels

High: 0Moderate: 23Low: 0

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

ZIP directory

Water reports in Tucson

Open a ZIP for site-level provenance and measurements.

ZIP code

85701

Very Hard

245 PPM

Nearest site
9.8 mi
Confidence
Moderate

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ZIP code

85705

Very Hard

209.5 PPM

Nearest site
6.8 mi
Confidence
Moderate

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ZIP code

85706

Very Hard

245 PPM

Nearest site
14.7 mi
Confidence
Moderate

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ZIP code

85707

Very Hard

245 PPM

Nearest site
15.1 mi
Confidence
Moderate

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ZIP code

85708

Very Hard

245 PPM

Nearest site
16.7 mi
Confidence
Moderate

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ZIP code

85709

Very Hard

245 PPM

Nearest site
13.3 mi
Confidence
Moderate

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ZIP code

85710

Very Hard

245 PPM

Nearest site
17.3 mi
Confidence
Moderate

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ZIP code

85711

Very Hard

245 PPM

Nearest site
14.1 mi
Confidence
Moderate

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ZIP code

85712

Very Hard

245 PPM

Nearest site
12.9 mi
Confidence
Moderate

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ZIP code

85713

Very Hard

245 PPM

Nearest site
9.4 mi
Confidence
Moderate

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ZIP code

85714

Very Hard

245 PPM

Nearest site
13.1 mi
Confidence
Moderate

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ZIP code

85715

Very Hard

245 PPM

Nearest site
15.9 mi
Confidence
Moderate

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ZIP code

85716

Very Hard

245 PPM

Nearest site
11.2 mi
Confidence
Moderate

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ZIP code

85719

Very Hard

245.5 PPM

Nearest site
9.8 mi
Confidence
Moderate

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ZIP code

85721

Very Hard

245 PPM

Nearest site
10.2 mi
Confidence
Moderate

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ZIP code

85723

Very Hard

245 PPM

Nearest site
11.8 mi
Confidence
Moderate

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ZIP code

85724

Very Hard

245 PPM

Nearest site
10.1 mi
Confidence
Moderate

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ZIP code

85726

Very Hard

245 PPM

Nearest site
11.5 mi
Confidence
Moderate

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ZIP code

85730

Very Hard

245 PPM

Nearest site
23.6 mi
Confidence
Moderate

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ZIP code

85734

Very Hard

245 PPM

Nearest site
21.5 mi
Confidence
Moderate

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ZIP code

85747

Very Hard

245 PPM

Nearest site
24.2 mi
Confidence
Moderate

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ZIP code

85748

Very Hard

245 PPM

Nearest site
21.1 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

85756

Very Hard

245 PPM

Nearest site
20 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Tucson City Of

PWSID AZ0410112

Groundwater
System population served
732,906
Last reported
May 14, 2026

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

Metropolitan Dwid

PWSID AZ0410076

Groundwater
System population served
45,570
Last reported
May 14, 2026

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

Usaf Davis Monthan Afb

PWSID AZ0420549

Groundwater
System population served
18,640
Last reported
May 14, 2026

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

Vail Water Company

PWSID AZ0410041

Groundwater
System population served
17,500
Last reported
May 14, 2026

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

Flowing Wells Irrigation District

PWSID AZ0410051

Groundwater
System population served
16,000
Last reported
May 14, 2026

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

Tucson Water Corona De Tucson

PWSID AZ0410169

Groundwater
System population served
10,217
Last reported
May 14, 2026

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

Avra Water Coop Inc

PWSID AZ0410006

Groundwater
System population served
6,685
Last reported
May 14, 2026

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

Metropolitan Dwid - Diablo Village

PWSID AZ0410357

Groundwater
System population served
5,542
Last reported
May 14, 2026

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

Adoc Tucson

PWSID AZ0420557

Groundwater
System population served
4,500
Last reported
May 14, 2026

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

Ray Water Company Inc

PWSID AZ0410095

Groundwater
System population served
4,495
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 RuleAZ0410074Mar 1, 2026Unaddressed
Revised Total Coliform RuleAZ0410435Mar 1, 2026Unaddressed
Revised Total Coliform RuleAZ0410051Feb 1, 2026Unaddressed
Revised Total Coliform RuleAZ0410435Feb 1, 2026Unaddressed
EthylbenzeneAZ0410112Jan 1, 2026Archived
trans-1,2-DichloroethyleneAZ0410112Jan 1, 2026Archived
1,1,1-TrichloroethaneAZ0410112Jan 1, 2026Archived
TolueneAZ0410112Jan 1, 2026Archived
Radium-228AZ0410112Jan 1, 2026Archived
Vinyl chlorideAZ0410112Jan 1, 2026Archived

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 Tucson

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.