City water profile
Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Grand Forks, North Dakota.
Median indexed hardness
638PPM
3 indexed ZIPs
Range 585–638 PPM
City summary
Grand Forks has 3 published ZIP profiles across Grand Forks County. The indexed median is 638 PPM, compared with 372 PPM across North Dakota.
Among the 210 North Dakotacities with an indexed median, Grand Forks ranks #4from highest to lowest. Across all 226 state ZIP profiles, available estimates run from 170.5to 716 PPM.
The 585–638 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 6, 2016 to Jun 1, 2026.
ZIP directory
Open a ZIP for site-level provenance and measurements.
Public water systems
PWSID ND1800410
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.
No violation records are included in the current lookback window.
Practical next steps
Continue comparing
Questions people ask
The indexed city median is 638 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.