City water profile
Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Big Sky, Montana.
Median indexed hardness
38PPM
2 indexed ZIPs
Range 8–68.9 PPM
City summary
Big Sky has 2 published ZIP profiles across Madison County and Gallatin County. The indexed median is 38 PPM, compared with 122 PPM across Montana.
Among the 117 Montanacities with an indexed median, Big Sky ranks #94from highest to lowest. Across all 145 state ZIP profiles, available estimates run from 0.2to 799.5 PPM.
The 8–68.9 PPM range shows how much the available ZIP estimates vary within the city label.
Hardness distribution
2 of 2 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.
Evidence quality
Confidence labels
Observation window: Feb 25, 2016 to May 5, 2026.
ZIP directory
Open a ZIP for site-level provenance and measurements.
Public water systems
PWSID MT0002385
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID MT0004468
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID MT0004023
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID MT0004236
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID MT0004462
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID MT0004035
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID MT0004916
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID MT0004202
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID MT0004588
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID MT0004470
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 |
|---|---|---|---|
| Nitrate-Nitrite | MT0002385 | Apr 1, 2025 | Resolved |
| Groundwater Rule | MT0004236 | Jun 1, 2022 | Resolved |
| Revised Total Coliform Rule | MT0004470 | Oct 1, 2021 | Resolved |
Practical next steps
Continue comparing
Questions people ask
The indexed city median is 38 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.