City water profile
Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Denver, Colorado.
Median indexed hardness
54PPM
33 indexed ZIPs
Range 23.3–60.6 PPM
City summary
Denver has 33 published ZIP profiles across Jefferson County and Denver County. The indexed median is 54 PPM, compared with 59 PPM across Colorado.
Among the 58 Coloradocities with an indexed median, Denver ranks #43from highest to lowest. Across all 161 state ZIP profiles, available estimates run from 13.7to 829 PPM.
The 23.3–60.6 PPM range shows how much the available ZIP estimates vary within the city label.
Hardness distribution
33 of 33 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.
ZIP code
60.6 PPM
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ZIP code
54.6 PPM
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ZIP code
52.6 PPM
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ZIP code
55.9 PPM
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ZIP code
52.3 PPM
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ZIP code
52.6 PPM
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ZIP code
51.9 PPM
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ZIP code
54.6 PPM
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ZIP code
54.6 PPM
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ZIP code
54.9 PPM
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ZIP code
55.9 PPM
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ZIP code
52.6 PPM
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ZIP code
52.6 PPM
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ZIP code
58.8 PPM
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ZIP code
52.3 PPM
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ZIP code
54.6 PPM
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ZIP code
55.9 PPM
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ZIP code
54.6 PPM
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ZIP code
53.6 PPM
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ZIP code
54.8 PPM
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ZIP code
60.6 PPM
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ZIP code
58.8 PPM
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ZIP code
54.8 PPM
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ZIP code
52.6 PPM
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ZIP code
52.6 PPM
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ZIP code
53.6 PPM
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ZIP code
53.6 PPM
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ZIP code
23.3 PPM
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ZIP code
52.6 PPM
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ZIP code
52.3 PPM
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ZIP code
52.6 PPM
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ZIP code
52.3 PPM
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ZIP code
52.3 PPM
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Public water systems
PWSID CO0116104
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID CO0101300
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID CO0116001
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 |
|---|---|---|---|
| Interim Enhanced Surface Water Treatment Rule | CO0116001 | Mar 1, 2024 | Resolved |
| Lead and Copper Rule | CO0116104 | Jan 1, 2024 | Resolved |
| Combined Uranium | CO0116001 | Jan 1, 2024 | Resolved |
| Methoxychlor | CO0116001 | Jan 1, 2023 | Archived |
| Toxaphene | CO0116001 | Jan 1, 2023 | Archived |
| Diquat | CO0116001 | Jan 1, 2023 | Archived |
| Dalapon | CO0116001 | Jan 1, 2023 | Archived |
| OXAMYL | CO0116001 | Jan 1, 2023 | Archived |
| Di(2-ethylhexyl) phthalate | CO0116001 | Jan 1, 2023 | Archived |
| Dinoseb | CO0116001 | Jan 1, 2023 | Archived |
Practical next steps
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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.