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City water profile

Three Lakes water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Three Lakes, Wisconsin.

Median indexed hardness

186PPM

One indexed ZIP

Range 186–186 PPM

State comparison
102 PPM below
State hardness rank
#450 of 479
Matched utilities
2
Active health records
0

City summary

What the indexed records say

Three Lakes has 1 published ZIP profile across Oneida County. The indexed median is 186 PPM, compared with 288 PPM across Wisconsin.

Among the 479 Wisconsincities with an indexed median, Three Lakes ranks #450from highest to lowest. Across all 556 state ZIP profiles, available estimates run from 41.3to 467 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.

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
19.8 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 1Low: 0

Observation window: Aug 21, 2023 to Sep 12, 2024.

ZIP directory

Water reports in Three Lakes

Open a ZIP for site-level provenance and measurements.

ZIP code

54562

Very Hard

186 PPM

Nearest site
19.8 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Three Lakes Sanitary District

PWSID WI7440129

Groundwater
System population served
500
Last reported
May 29, 2026

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

Northernaire Sanitary District

PWSID WI7440812

Groundwater
System population served
315
Last reported
May 29, 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
Consumer Confidence RuleWI7440129Jul 1, 2025Resolved
Consumer Confidence RuleWI7440812Jul 1, 2025Resolved
Consumer Confidence RuleWI7440812Jul 1, 2025Resolved
Revised Total Coliform RuleWI7440812May 1, 2025Resolved
Revised Total Coliform RuleWI7440129Mar 1, 2025Resolved
Groundwater RuleWI7440129Jan 16, 2025Resolved · health-based
Revised Total Coliform RuleWI7440812Dec 23, 2024Resolved
Revised Total Coliform RuleWI7440812Dec 23, 2024Resolved · health-based
LEAD AND COPPER RULE REVISIONSWI7440129Oct 17, 2024Resolved
LEAD AND COPPER RULE REVISIONSWI7440129Oct 17, 2024Resolved · health-based

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 Three Lakes

Is the water hard?

The indexed city median is 186 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.