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City water profile

Tempe water quality

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

Median indexed hardness

208PPM

4 indexed ZIPs

Range 208–208 PPM

State comparison
33 PPM below
State hardness rank
#116 of 133
Matched utilities
1
Active health records
0

City summary

What the indexed records say

Tempe has 4 published ZIP profiles across Maricopa County. The indexed median is 208 PPM, compared with 241 PPM across Arizona.

Among the 133 Arizonacities with an indexed median, Tempe ranks #116from highest to lowest. Across all 285 state ZIP profiles, available estimates run from 66.4to 1250 PPM.

The 208–208 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 hard4 ZIPs

4 of 4 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
4.5 miles
Profiles with evidence
4/4

Confidence labels

High: 0Moderate: 4Low: 0

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

ZIP directory

Water reports in Tempe

Open a ZIP for site-level provenance and measurements.

ZIP code

85281

Very Hard

208 PPM

Nearest site
3.9 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

85282

Very Hard

208 PPM

Nearest site
3.7 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

85283

Very Hard

208 PPM

Nearest site
4.5 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

85284

Very Hard

208 PPM

Nearest site
5.7 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Tempe City Of

PWSID AZ0407100

Surface water
System population served
165,000
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.

No violation records are included in the current lookback window.

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 Tempe

Is the water hard?

The indexed city median is 208 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.