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City water profile

Mammoth water quality

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

Median indexed hardness

210PPM

2 indexed ZIPs

Range 209.5–209.5 PPM

State comparison
31 PPM below
State hardness rank
#110 of 133
Matched utilities
1
Active health records
1

City summary

What the indexed records say

Mammoth has 2 published ZIP profiles across Pinal County. The indexed median is 210 PPM, compared with 241 PPM across Arizona.

Among the 133 Arizonacities with an indexed median, Mammoth ranks #110from highest to lowest. Across all 285 state ZIP profiles, available estimates run from 66.4to 1250 PPM.

The 209.5–209.5 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 hard2 ZIPs

2 of 2 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
39 miles
Profiles with evidence
2/2

Confidence labels

High: 0Moderate: 0Low: 2

Observation window: Jan 11, 2016 to Aug 16, 2016.

ZIP directory

Water reports in Mammoth

Open a ZIP for site-level provenance and measurements.

ZIP code

85618

Very Hard

209.5 PPM

Nearest site
39 mi
Confidence
Low

View full ZIP evidence →

ZIP code

85623

Very Hard

209.5 PPM

Nearest site
29.1 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

Mammoth Town Of

PWSID AZ0411018

Groundwater
System population served
1,181
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

1 unique active health-based record appears among associated systems. This does not mean every contaminant was tested at every tap.

RecordSystemPeriodStatus
Lead and Copper RuleAZ0411018Jan 1, 2026Unaddressed
Lead and Copper RuleAZ0411018Dec 1, 2025Unaddressed · health-based
Public NoticeAZ0411018Nov 20, 2025Resolved
Public NoticeAZ0411018Nov 16, 2025Resolved
Consumer Confidence RuleAZ0411018Oct 2, 2025Resolved
LEAD AND COPPER RULE REVISIONSAZ0411018Jul 2, 2025Unaddressed
TTHMAZ0411018Jul 1, 2024Resolved
Total Haloacetic Acids (HAA5)AZ0411018Jul 1, 2024Resolved
ChlorineAZ0411018Jun 1, 2024Resolved
Consumer Confidence RuleAZ0411018Oct 2, 2023Resolved

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 Mammoth

Is the water hard?

The indexed city median is 210 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.