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City water profile

Spring Green water quality

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

Median indexed hardness

284PPM

One indexed ZIP

Range 283.5–283.5 PPM

State comparison
4 PPM below
State hardness rank
#269 of 479
Matched utilities
5
Active health records
1

City summary

What the indexed records say

Spring Green has 1 published ZIP profile across Sauk County. The indexed median is 284 PPM, compared with 288 PPM across Wisconsin.

Among the 479 Wisconsincities with an indexed median, Spring Green ranks #269from 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
0.6 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 1Low: 0

Observation window: Aug 3, 2016 to Aug 20, 2024.

ZIP directory

Water reports in Spring Green

Open a ZIP for site-level provenance and measurements.

ZIP code

53588

Very Hard

283.5 PPM

Nearest site
0.6 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Spring Green Waterworks

PWSID WI1570109

Groundwater
System population served
1,626
Last reported
May 29, 2026

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

House On The Rock Resort

PWSID WI1250318

Groundwater
System population served
470
Last reported
May 29, 2026

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

Spring Green Estates

PWSID WI1570110

Groundwater
System population served
300
Last reported
May 29, 2026

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

Spring Green Estates South

PWSID WI1571282

Groundwater
System population served
40
Last reported
May 29, 2026

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

Spring Green Estates North

PWSID WI1571284

Groundwater
System population served
32
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

1 unique active health-based record appears among associated systems. This does not mean every contaminant was tested at every tap.

RecordSystemPeriodStatus
Groundwater RuleWI1571282Dec 2, 2025Unaddressed · health-based
Radium-228WI1571284Mar 1, 2025Archived
Combined Radium (-226 and -228)WI1571284Mar 1, 2025Archived
Consumer Confidence RuleWI1571284Jul 1, 2024Resolved
Consumer Confidence RuleWI1571284Jul 1, 2024Resolved
Stage 1 Disinfectants and Disinfection Byproducts RuleWI1250318Apr 2, 2024Resolved · health-based
Lead and Copper RuleWI1571282Jul 1, 2022Resolved
Lead and Copper RuleWI1570110Jan 1, 2022Resolved
Revised Total Coliform RuleWI1250318Jan 1, 2021Resolved

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 Spring Green

Is the water hard?

The indexed city median is 284 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.