City water profile
Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Dubuque, Iowa.
Median indexed hardness
272PPM
3 indexed ZIPs
Range 268–274 PPM
City summary
Dubuque has 3 published ZIP profiles across Dubuque County. The indexed median is 272 PPM, compared with 281 PPM across Iowa.
Among the 683 Iowacities with an indexed median, Dubuque ranks #457from highest to lowest. Across all 723 state ZIP profiles, available estimates run from 182to 834 PPM.
The 268–274 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: Feb 9, 2016 to Mar 3, 2026.
ZIP directory
Open a ZIP for site-level provenance and measurements.
Public water systems
PWSID IA3126052
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID IA3126605
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID IA3126604
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID IA3100600
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID IA3126603
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID IA3126304
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID IA3126316
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID IA3126303
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID IA3100601
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID IA3126306
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 | IA3100823 | Mar 1, 2026 | Archived |
| Revised Total Coliform Rule | IA3100823 | Jan 1, 2026 | Resolved |
| Total Haloacetic Acids (HAA5) | IA3126604 | Aug 1, 2025 | Archived |
| TTHM | IA3126604 | Aug 1, 2025 | Archived |
| TTHM | IA3126307 | Aug 1, 2025 | Archived |
| Total Haloacetic Acids (HAA5) | IA3126307 | Aug 1, 2025 | Archived |
| Revised Total Coliform Rule | IA3126307 | May 1, 2025 | Resolved |
| Public Notice | IA3126303 | Jan 21, 2025 | Resolved |
| Public Notice | IA3100609 | Jan 21, 2025 | Resolved |
| Revised Total Coliform Rule | IA3126603 | Jan 1, 2025 | Resolved |
Practical next steps
Continue comparing
Questions people ask
The indexed city median is 272 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.