City water profile
Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Denison, Texas.
Median indexed hardness
113PPM
2 indexed ZIPs
Range 111.5–113.5 PPM
City summary
Denison has 2 published ZIP profiles across Grayson County. The indexed median is 113 PPM, compared with 111 PPM across Texas.
Among the 523 Texascities with an indexed median, Denison ranks #302from highest to lowest. Across all 1,026 state ZIP profiles, available estimates run from 5.4to 500.5 PPM.
The 111.5–113.5 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: Jan 5, 2016 to Jun 4, 2026.
ZIP directory
Open a ZIP for site-level provenance and measurements.
Public water systems
PWSID TX0910003
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 |
|---|---|---|---|
| LEAD AND COPPER RULE REVISIONS | TX0910003 | Jul 2, 2025 | Resolved |
| Revised Total Coliform Rule | TX0910003 | Aug 1, 2023 | Resolved |
| Public Notice | TX0910003 | Feb 19, 2021 | Resolved |
Practical next steps
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Questions people ask
The indexed city median is 113 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.