City water profile
Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Westminster, Colorado.
Median indexed hardness
54PPM
3 indexed ZIPs
Range 45.8–53.6 PPM
City summary
Westminster has 3 published ZIP profiles across Adams County. The indexed median is 54 PPM, compared with 59 PPM across Colorado.
Among the 58 Coloradocities with an indexed median, Westminster ranks #42from highest to lowest. Across all 161 state ZIP profiles, available estimates run from 13.7to 829 PPM.
The 45.8–53.6 PPM range shows how much the available ZIP estimates vary within the city label.
Hardness distribution
3 of 3 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.
Evidence quality
Confidence labels
Observation window: Jan 5, 2016 to Jun 2, 2026.
ZIP directory
Open a ZIP for site-level provenance and measurements.
Public water systems
PWSID CO0101170
A municipal system, in-state city, and served county all agree with this Census 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 |
|---|---|---|---|
| Surface Water Treatment Rule | CO0101170 | Jan 1, 2025 | Resolved |
| Surface Water Treatment Rule | CO0101170 | Dec 1, 2024 | Resolved |
| Surface Water Treatment Rule | CO0101170 | Jan 1, 2022 | Resolved |
Practical next steps
Continue comparing
Questions people ask
The indexed city median is 54 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.