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City water profile

West Yellowstone water quality

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

Median indexed hardness

29PPM

One indexed ZIP

Range 29.3–29.3 PPM

State comparison
93 PPM below
State hardness rank
#113 of 117
Matched utilities
4
Active health records
1

City summary

What the indexed records say

West Yellowstone has 1 published ZIP profile across Gallatin County. The indexed median is 29 PPM, compared with 122 PPM across Montana.

Among the 117 Montanacities with an indexed median, West Yellowstone ranks #113from 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

Soft1 ZIP
Moderately hard0 ZIPs
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
53.5 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 0Low: 1

Observation window: Mar 21, 2018 to Sep 25, 2019.

ZIP directory

Water reports in West Yellowstone

Open a ZIP for site-level provenance and measurements.

ZIP code

59758

Soft

29.3 PPM

Nearest site
53.5 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

West Yellowstone Town Of

PWSID MT0003136

Groundwater
System population served
9,899
Last reported
Jun 29, 2026

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

Hebgen Lake Estates Co Water Sewer Distr

PWSID MT0001983

Groundwater
System population served
230
Last reported
Jun 29, 2026

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

Yellowstone Holiday Wtr And Sew District

PWSID MT0001326

Groundwater
System population served
85
Last reported
Jun 29, 2026

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

Fishermans Village Subdivision

PWSID MT0004722

Groundwater
System population served
25
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

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

RecordSystemPeriodStatus
Revised Total Coliform RuleMT0004722Jan 1, 2026Unaddressed · health-based
E. COLIMT0004722Nov 15, 2025Resolved
Consumer Confidence RuleMT0004722Oct 1, 2025Unaddressed
EndrinMT0004722Oct 1, 2025Resolved
ToxapheneMT0004722Oct 1, 2025Resolved
OXAMYLMT0004722Oct 1, 2025Resolved
SimazineMT0004722Oct 1, 2025Resolved
Di(2-ethylhexyl) phthalateMT0004722Oct 1, 2025Resolved
DinosebMT0004722Oct 1, 2025Resolved
LASSOMT0004722Oct 1, 2025Resolved

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 West Yellowstone

Is the water hard?

The indexed city median is 29 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.