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City water profile

Fairfield water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Fairfield, Montana.

Median indexed hardness

120PPM

One indexed ZIP

Range 120–120 PPM

State comparison
2 PPM below
State hardness rank
#60 of 117
Matched utilities
2
Active health records
0

City summary

What the indexed records say

Fairfield has 1 published ZIP profile across Teton County. The indexed median is 120 PPM, compared with 122 PPM across Montana.

Among the 117 Montanacities with an indexed median, Fairfield ranks #60from highest to lowest. Across all 145 state ZIP profiles, available estimates run from 0.2to 799.5 PPM.

Because only one ZIP is represented, the city median and range are the same local estimate. It should not be read as multiple independent samples across the community. 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 hard1 ZIP
Hard0 ZIPs
Very hard0 ZIPs

1 of 1 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
53 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 0Low: 1

Observation window: Feb 26, 2016 to Aug 7, 2024.

ZIP directory

Water reports in Fairfield

Open a ZIP for site-level provenance and measurements.

ZIP code

59436

Moderately Hard

120 PPM

Nearest site
53 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

Fairfield Town Of

PWSID MT0000212

Groundwater
System population served
718
Last reported
Jun 29, 2026

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

Tri County Water District

PWSID MT0002912

Groundwater
System population served
470
Last reported
Jun 29, 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 RuleMT0002912Dec 30, 2024Resolved
Consumer Confidence RuleMT0002912Jul 1, 2023Resolved
Total Haloacetic Acids (HAA5)MT0002912Jan 1, 2023Resolved
TTHMMT0002912Jan 1, 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 Fairfield

Is the water hard?

The indexed city median is 120 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.