Skip to content

City water profile

Grand Marais water quality

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

Median indexed hardness

46PPM

One indexed ZIP

Range 46.1–46.1 PPM

State comparison
272 PPM below
State hardness rank
#250 of 250
Matched utilities
1
Active health records
0

City summary

What the indexed records say

Grand Marais has 1 published ZIP profile across Cook County. The indexed median is 46 PPM, compared with 318 PPM across Minnesota.

Among the 250 Minnesotacities with an indexed median, Grand Marais ranks #250from highest to lowest. Across all 321 state ZIP profiles, available estimates run from 46.1to 716 PPM.

Because only one ZIP is represented, the city median and range are the same local estimate. It should not be read as multiple independent samples across the community. At least one estimate is marked low confidence, so observation distance and date deserve extra attention.

Hardness distribution

How local ZIP estimates compare

Soft1 ZIP
Moderately hard0 ZIPs
Hard0 ZIPs
Very hard0 ZIPs

1 of 1 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
42.4 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 0Low: 1

Observation window: Jan 26, 2016 to Feb 22, 2026.

ZIP directory

Water reports in Grand Marais

Open a ZIP for site-level provenance and measurements.

ZIP code

55604

Soft

46.1 PPM

Nearest site
42.4 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

Grand Marais

PWSID MN1160001

Surface water
System population served
1,344
Last reported
May 28, 2026

A municipal system, in-state city, and served county all agree with this Census 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
Interim Enhanced Surface Water Treatment RuleMN1160001Sep 1, 2023Archived
Interim Enhanced Surface Water Treatment RuleMN1160001Aug 1, 2023Archived

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 Marais

Is the water hard?

The indexed city median is 46 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.