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City water profile

Flagstaff water quality

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

Median indexed hardness

250PPM

3 indexed ZIPs

Range 247.5–264 PPM

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

City summary

What the indexed records say

Flagstaff has 3 published ZIP profiles across Coconino County. The indexed median is 250 PPM, compared with 241 PPM across Arizona.

Among the 133 Arizonacities with an indexed median, Flagstaff ranks #53from highest to lowest. Across all 285 state ZIP profiles, available estimates run from 66.4to 1250 PPM.

The 247.5–264 PPM range shows how much the available ZIP estimates vary within the city label. 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 hard3 ZIPs

3 of 3 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
32.9 miles
Profiles with evidence
3/3

Confidence labels

High: 0Moderate: 0Low: 3

Observation window: Jan 19, 2016 to Mar 24, 2026.

ZIP directory

Water reports in Flagstaff

Open a ZIP for site-level provenance and measurements.

ZIP code

86004

Very Hard

264 PPM

Nearest site
37.2 mi
Confidence
Low

View full ZIP evidence →

ZIP code

86005

Very Hard

250 PPM

Nearest site
30.1 mi
Confidence
Low

View full ZIP evidence →

ZIP code

86011

Very Hard

247.5 PPM

Nearest site
32.9 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

Flagstaff City Of

PWSID AZ0403008

Surface water
System population served
79,796
Last reported
May 14, 2026

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

Doney Park Water

PWSID AZ0403005

Groundwater
System population served
8,996
Last reported
May 14, 2026

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

Kachina Village Dwid

PWSID AZ0403013

Groundwater
System population served
3,500
Last reported
May 14, 2026

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

Forest Highlands Water Company

PWSID AZ0403073

Groundwater
System population served
1,668
Last reported
May 14, 2026

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

Ponderosa Utility Corp

PWSID AZ0403018

Groundwater
System population served
1,585
Last reported
May 14, 2026

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

Hidden Hollow Mhc

PWSID AZ0403362

Groundwater
System population served
400
Last reported
May 14, 2026

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

Cs Flagstaff Ranch Water Company

PWSID AZ0403088

Groundwater
System population served
350
Last reported
May 14, 2026

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

Mountain Dell Water Inc

PWSID AZ0403015

Groundwater
System population served
250
Last reported
May 14, 2026

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

Cs West Village Water Company

PWSID AZ0403021

Groundwater
System population served
210
Last reported
May 14, 2026

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

Lake Mary Country Store

PWSID AZ0403067

Groundwater
System population served
130
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
Lead and Copper RuleAZ0403088Jan 1, 2026Unaddressed
Lead and Copper RuleAZ0403067Jan 1, 2026Unaddressed
Public NoticeAZ0403011Dec 27, 2025Resolved
Public NoticeAZ0403067Oct 18, 2025Unaddressed
Groundwater RuleAZ0403011Oct 5, 2025Resolved · health-based
Consumer Confidence RuleAZ0403087Oct 2, 2025Unaddressed
Consumer Confidence RuleAZ0403175Oct 2, 2025Unaddressed
Lead and Copper RuleAZ0403088Oct 1, 2025Unaddressed
Lead and Copper RuleAZ0403011Oct 1, 2025Unaddressed
ArsenicAZ0403087Oct 1, 2025Archived

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 Flagstaff

Is the water hard?

The indexed city median is 250 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.