Is tap water safe in Mesa?

EPA SDWIS shows no active health-based violation in this profile's reporting window. That is not the same as proving every contaminant is absent, and federal data can lag state and utility records.

How hard is the water in Mesa, AZ?

Nearby USGS observations produce an estimate of 228 ppm (13.3 grains per gallon), classified as very hard. This is not a tap measurement.

Do I need a water softener in ZIP code 85201?

At 228 ppm, a correctly sized whole-house softener can reduce scale buildup and hard-water spotting. Treatment for hardness does not remove all health-related contaminants.

City water profile

Mesa water quality

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

Median indexed hardness

228PPM

14 indexed ZIPs

Range 211–228 PPM

State comparison: 13 PPM below
State hardness rank: #100 of 133
Matched utilities: 1
Active health records: 0

City summary

What the indexed records say

Mesa has 14 published ZIP profiles across Maricopa County. The indexed median is 228 PPM, compared with 241 PPM across Arizona.

Among the 133 Arizonacities with an indexed median, Mesa ranks #100from highest to lowest. Across all 285 state ZIP profiles, available estimates run from 66.4to 1250 PPM.

The 211–228 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 hard14 ZIPs

14 of 14 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance: 11.5 miles
Profiles with evidence: 14/14

Confidence labels

High: 0Moderate: 14Low: 0

Observation window: Jan 4, 2016 to May 29, 2026.

ZIP directory

Water reports in Mesa

Open a ZIP for site-level provenance and measurements.

ZIP code

85201

Very Hard

228 PPM

Nearest site: 8.6 mi
Confidence: Moderate

View full ZIP evidence →

ZIP code

85202

Very Hard

228 PPM

Nearest site: 7.1 mi
Confidence: Moderate

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ZIP code

85203

Very Hard

228 PPM

Nearest site: 11.6 mi
Confidence: Moderate

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ZIP code

85204

Very Hard

228 PPM

Nearest site: 12.1 mi
Confidence: Moderate

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ZIP code

85205

Very Hard

228 PPM

Nearest site: 11.4 mi
Confidence: Moderate

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ZIP code

85206

Very Hard

228 PPM

Nearest site: 13.4 mi
Confidence: Moderate

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ZIP code

85207

Very Hard

228 PPM

Nearest site: 7.7 mi
Confidence: Moderate

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ZIP code

85208

Very Hard

228 PPM

Nearest site: 10.9 mi
Confidence: Moderate

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ZIP code

85209

Very Hard

228 PPM

Nearest site: 12.5 mi
Confidence: Moderate

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ZIP code

85210

Very Hard

228 PPM

Nearest site: 8.8 mi
Confidence: Moderate

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ZIP code

85212

Very Hard

228 PPM

Nearest site: 16.3 mi
Confidence: Moderate

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ZIP code

85213

Very Hard

228 PPM

Nearest site: 13.1 mi
Confidence: Moderate

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ZIP code

85215

Very Hard

211 PPM

Nearest site: 2.8 mi
Confidence: Moderate

View full ZIP evidence →

ZIP code

85256

Very Hard

211 PPM

Nearest site: 11.5 mi
Confidence: Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Mesa City Of

PWSID AZ0407095

Surface water

System population served: 466,000
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.

Record	System	Period	Status
Revised Total Coliform Rule	AZ0407095	Aug 1, 2025	Resolved
Bromate	AZ0407095	Mar 1, 2025	Resolved
Bromate	AZ0407095	Feb 1, 2025	Resolved
1,2,4-Trichlorobenzene	AZ0407095	Jan 1, 2023	Resolved
DICHLOROMETHANE	AZ0407095	Jan 1, 2023	Resolved
p-Dichlorobenzene	AZ0407095	Jan 1, 2023	Resolved
1,1-Dichloroethylene	AZ0407095	Jan 1, 2023	Resolved
trans-1,2-Dichloroethylene	AZ0407095	Jan 1, 2023	Resolved
1,1,1-Trichloroethane	AZ0407095	Jan 1, 2023	Resolved
Trichloroethylene	AZ0407095	Jan 1, 2023	Resolved

Practical next steps

Move from index to evidence

1. Open your ZIP. Check distance, dates, confidence, and the associated utility.
2. Read the current CCR. Confirm source water, detections, limits, ranges, and notices.
3. Test the tap when needed. Confirm health concerns or treatment sizing with the right method.

Continue comparing

Other Arizona communities

Aguila

Maricopa County

243 PPM median

Avondale

Maricopa County

97 PPM median

Buckeye

Maricopa County

243 PPM median

Carefree

Maricopa County

229 PPM median

Cave Creek

Maricopa County

230 PPM median

Chandler

Maricopa County

228 PPM median

Search all 133 Arizona cities →

Questions people ask

About water in Mesa

Is the water hard?

The indexed city median is 228 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.