City water profile
Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Missoula, Montana.
Median indexed hardness
152PPM
5 indexed ZIPs
Range 101.6–152 PPM
City summary
Missoula has 5 published ZIP profiles across Missoula County. The indexed median is 152 PPM, compared with 122 PPM across Montana.
Among the 117 Montanacities with an indexed median, Missoula ranks #51from highest to lowest. Across all 145 state ZIP profiles, available estimates run from 0.2to 799.5 PPM.
The 101.6–152 PPM range shows how much the available ZIP estimates vary within the city label.
Hardness distribution
5 of 5 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.
Evidence quality
Confidence labels
Observation window: Mar 4, 2016 to May 6, 2026.
ZIP directory
Open a ZIP for site-level provenance and measurements.
ZIP code
152 PPM
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ZIP code
152 PPM
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ZIP code
138 PPM
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ZIP code
101.6 PPM
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ZIP code
152 PPM
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Public water systems
PWSID MT0000294
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID MT0000437
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID MT0004379
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID MT0003909
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID MT0000373
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID MT0004107
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID MT0002517
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID MT0003305
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID MT0003692
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID MT0000454
The system names this served city; Census place overlap links the city to this ZCTA.
Compliance history
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.
| Record | System | Period | Status |
|---|---|---|---|
| Revised Total Coliform Rule | MT0000453 | Mar 1, 2026 | Resolved |
| Lead and Copper Rule | MT0000450 | Oct 1, 2025 | Unaddressed |
| Lead and Copper Rule | MT0003215 | Oct 1, 2025 | Unaddressed |
| Lead and Copper Rule | MT0003012 | Oct 1, 2025 | Unaddressed |
| Lead and Copper Rule | MT0004074 | Oct 1, 2025 | Unaddressed |
| Revised Total Coliform Rule | MT0002517 | Jul 1, 2025 | Resolved · health-based |
| Consumer Confidence Rule | MT0004368 | Jul 1, 2025 | Resolved |
| Consumer Confidence Rule | MT0003565 | Jul 1, 2025 | Resolved |
| Nitrate-Nitrite | MT0005006 | Apr 1, 2025 | Resolved |
| Revised Total Coliform Rule | MT0000367 | Mar 1, 2025 | Resolved |
Practical next steps
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Questions people ask
The indexed city median is 152 PPM. Open the ZIP report to verify the distance and confidence behind that estimate.
Compliance history is utility-wide and cannot guarantee conditions at every tap. Check current notices and test when address-specific evidence is needed.
Choose treatment only after confirming the problem at the property. A softener targets hardness; contaminant treatment requires a matching, verified performance claim.