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City water profile

Hamilton water quality

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

Median indexed hardness

126PPM

One indexed ZIP

Range 126–126 PPM

State comparison
4 PPM above
State hardness rank
#57 of 117
Matched utilities
10
Active health records
0

City summary

What the indexed records say

Hamilton has 1 published ZIP profile across Ravalli County. The indexed median is 126 PPM, compared with 122 PPM across Montana.

Among the 117 Montanacities with an indexed median, Hamilton ranks #57from 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 hard0 ZIPs
Hard1 ZIP
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
33.5 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 0Low: 1

Observation window: Mar 4, 2016 to Jun 9, 2026.

ZIP directory

Water reports in Hamilton

Open a ZIP for site-level provenance and measurements.

ZIP code

59840

Hard

126 PPM

Nearest site
33.5 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

Hamilton City Of

PWSID MT0000234

Groundwater
System population served
5,660
Last reported
Jun 29, 2026

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

Stock Farm The

PWSID MT0003982

Groundwater
System population served
150
Last reported
Jun 29, 2026

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

Daly Estates Subdivision

PWSID MT0004517

Groundwater
System population served
123
Last reported
Jun 29, 2026

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

Wild Flower Hoa, The

PWSID MT0004533

Groundwater
System population served
120
Last reported
Jun 29, 2026

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

Westana Mobile Manor Hamilton

PWSID MT0000634

Groundwater
System population served
90
Last reported
Jun 29, 2026

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

Antigone Acres Hoa

PWSID MT0003003

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.

White Bird Community The

PWSID MT0000506

Groundwater
System population served
82
Last reported
Jun 29, 2026

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

Bluebird Mb Hm Park Hamilton

PWSID MT0001083

Groundwater
System population served
75
Last reported
Jun 29, 2026

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

Sawtooth Villa

PWSID MT0003284

Groundwater
System population served
70
Last reported
Jun 29, 2026

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

Big Sky Trailer Ct Hamilton

PWSID MT0000504

Groundwater
System population served
70
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 RuleMT0003982Dec 30, 2024Resolved
Consumer Confidence RuleMT0004533Jul 1, 2024Resolved

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 Hamilton

Is the water hard?

The indexed city median is 126 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.