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City water profile

Rochester water quality

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

Median indexed hardness

293PPM

6 indexed ZIPs

Range 285.5–302 PPM

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

City summary

What the indexed records say

Rochester has 6 published ZIP profiles across Olmsted County. The indexed median is 293 PPM, compared with 318 PPM across Minnesota.

Among the 250 Minnesotacities with an indexed median, Rochester ranks #186from highest to lowest. Across all 321 state ZIP profiles, available estimates run from 46.1to 716 PPM.

The 285.5–302 PPM range shows how much the available ZIP estimates vary within the city label. At least one estimate is marked low confidence, so observation distance and date deserve extra attention.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs
Moderately hard0 ZIPs
Hard0 ZIPs
Very hard6 ZIPs

6 of 6 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
30.2 miles
Profiles with evidence
6/6

Confidence labels

High: 0Moderate: 0Low: 6

Observation window: Jul 11, 2017 to Sep 10, 2024.

ZIP directory

Water reports in Rochester

Open a ZIP for site-level provenance and measurements.

ZIP code

55901

Very Hard

287 PPM

Nearest site
28.9 mi
Confidence
Low

View full ZIP evidence →

ZIP code

55902

Very Hard

302 PPM

Nearest site
25.7 mi
Confidence
Low

View full ZIP evidence →

ZIP code

55903

Very Hard

298 PPM

Nearest site
30.2 mi
Confidence
Low

View full ZIP evidence →

ZIP code

55904

Very Hard

298 PPM

Nearest site
30.6 mi
Confidence
Low

View full ZIP evidence →

ZIP code

55905

Very Hard

287 PPM

Nearest site
27 mi
Confidence
Low

View full ZIP evidence →

ZIP code

55906

Very Hard

285.5 PPM

Nearest site
33.6 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

Rochester

PWSID MN1550010

Groundwater
System population served
123,624
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.

No violation records are included in the current lookback window.

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 Rochester

Is the water hard?

The indexed city median is 293 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.