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City water profile

Shelby water quality

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

Median indexed hardness

—

One indexed ZIP

Range —–— PPM

State comparison
Unavailable
State hardness rank
—
Matched utilities
5
Active health records
0

City summary

What the indexed records say

Shelby has 1 published ZIP profile across Toole County. No qualifying nearby hardness observation is available for the city.

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.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs
Moderately hard0 ZIPs
Hard0 ZIPs
Very hard0 ZIPs

0 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
— miles
Profiles with evidence
0/1

Confidence labels

High: 0Moderate: 0Low: 0

Observation window: unavailable to unavailable.

ZIP directory

Water reports in Shelby

Open a ZIP for site-level provenance and measurements.

ZIP code

59474

No estimate

—

Nearest site
— mi
Confidence
—

View full ZIP evidence →

Public water systems

Utilities associated with this city

Shelby City Of

PWSID MT0000328

Groundwater
System population served
3,970
Last reported
Jun 29, 2026

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

Ncmrwa North Shelby

PWSID MT0005064

Groundwater
System population served
300
Last reported
Jun 29, 2026

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

Oilmont County Water District

PWSID MT0000587

Groundwater
System population served
300
Last reported
Jun 29, 2026

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

Devon Water Inc

PWSID MT0000200

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.

Ethridge County Water District

PWSID MT0004353

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 RuleMT0000200Oct 1, 2025Unaddressed
Lead and Copper RuleMT0005064Apr 1, 2025Resolved
Lead and Copper RuleMT0004353Dec 30, 2024Resolved
Lead and Copper RuleMT0000328Oct 1, 2024Unaddressed
Consumer Confidence RuleMT0000587Jul 1, 2024Resolved
Consumer Confidence RuleMT0000200Jul 1, 2024Unaddressed
Lead and Copper RuleMT0005064Jan 1, 2024Resolved
Lead and Copper RuleMT0000200Oct 1, 2023Resolved
Consumer Confidence RuleMT0000587Jul 1, 2023Resolved
Consumer Confidence RuleMT0000200Jul 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 Shelby

Is the water hard?

The index does not have a qualifying hardness estimate for this city.

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.