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City water profile

Lake Crystal water quality

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

Median indexed hardness

309PPM

One indexed ZIP

Range 309–309 PPM

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

City summary

What the indexed records say

Lake Crystal has 1 published ZIP profile across Blue Earth County. The indexed median is 309 PPM, compared with 318 PPM across Minnesota.

Among the 250 Minnesotacities with an indexed median, Lake Crystal ranks #155from 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

Soft0 ZIPs
Moderately hard0 ZIPs
Hard0 ZIPs
Very hard1 ZIP

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
53.4 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 0Low: 1

Observation window: May 10, 2016 to Aug 23, 2018.

ZIP directory

Water reports in Lake Crystal

Open a ZIP for site-level provenance and measurements.

ZIP code

56055

Very Hard

309 PPM

Nearest site
53.4 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

Lake Crystal

PWSID MN1070006

Groundwater
System population served
2,554
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 Lake Crystal

Is the water hard?

The indexed city median is 309 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.