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City water profile

Grand Junction water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Grand Junction, Colorado.

Median indexed hardness

382PPM

4 indexed ZIPs

Range 373–389 PPM

State comparison
323 PPM above
State hardness rank
#9 of 58
Matched utilities
2
Active health records
0

City summary

What the indexed records say

Grand Junction has 4 published ZIP profiles across Mesa County. The indexed median is 382 PPM, compared with 59 PPM across Colorado.

Among the 58 Coloradocities with an indexed median, Grand Junction ranks #9from highest to lowest. Across all 161 state ZIP profiles, available estimates run from 13.7to 829 PPM.

The 373–389 PPM range shows how much the available ZIP estimates vary within the city label.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs
Moderately hard0 ZIPs
Hard0 ZIPs
Very hard4 ZIPs

4 of 4 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
3.5 miles
Profiles with evidence
4/4

Confidence labels

High: 0Moderate: 4Low: 0

Observation window: Jan 5, 2016 to Jun 9, 2026.

ZIP directory

Water reports in Grand Junction

Open a ZIP for site-level provenance and measurements.

ZIP code

81501

Very Hard

389 PPM

Nearest site
1.2 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

81504

Very Hard

373 PPM

Nearest site
3.9 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

81505

Very Hard

377 PPM

Nearest site
3.5 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

81506

Very Hard

387 PPM

Nearest site
0.2 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Grand Junction City Of

PWSID CO0139321

Surface water
System population served
26,000
Last reported
Jun 17, 2026

A municipal system, in-state city, and served county all agree with this Census ZCTA.

Twin Rivers Mhp, Llc

PWSID CO0139760

Surface water
System population served
67
Last reported
Jun 17, 2026

The system names this served city; Census place overlap links the city to this ZCTA.

Compliance history

What EPA records show

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.

RecordSystemPeriodStatus
Revised Total Coliform RuleCO0139760Mar 25, 2026Resolved
Public NoticeCO0139760Jul 15, 2025Resolved
Surface Water Treatment RuleCO0139760Mar 1, 2023Resolved
Surface Water Treatment RuleCO0139760Feb 1, 2023Resolved
ChlorineCO0139760Jan 1, 2023Resolved
Surface Water Treatment RuleCO0139760Jan 1, 2023Resolved
Revised Total Coliform RuleCO0139760Oct 11, 2022Resolved
Stage 2 Disinfectants and Disinfection Byproducts RuleCO0139760Oct 11, 2022Resolved
Surface Water Treatment RuleCO0139760Sep 1, 2022Resolved
Revised Total Coliform RuleCO0139760Sep 1, 2022Resolved

Practical next steps

Move from index to evidence

  1. 1. Open your ZIP. Check distance, dates, confidence, and the associated utility.
  2. 2. Read the current CCR. Confirm source water, detections, limits, ranges, and notices.
  3. 3. Test the tap when needed. Confirm health concerns or treatment sizing with the right method.

Questions people ask

About water in Grand Junction

Is the water hard?

The indexed city median is 382 PPM. Open the ZIP report to verify the distance and confidence behind that estimate.

Is the tap water safe?

Compliance history is utility-wide and cannot guarantee conditions at every tap. Check current notices and test when address-specific evidence is needed.

Do I need treatment?

Choose treatment only after confirming the problem at the property. A softener targets hardness; contaminant treatment requires a matching, verified performance claim.