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City water profile

Superior water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Superior, Iowa.

Median indexed hardness

316PPM

One indexed ZIP

Range 316–316 PPM

State comparison
35 PPM above
State hardness rank
#237 of 683
Matched utilities
1
Active health records
0

City summary

What the indexed records say

Superior has 1 published ZIP profile across Dickinson County. The indexed median is 316 PPM, compared with 281 PPM across Iowa.

Among the 683 Iowacities with an indexed median, Superior ranks #237from highest to lowest. Across all 723 state ZIP profiles, available estimates run from 182to 834 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
69.7 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 0Low: 1

Observation window: Aug 2, 2017 to Aug 2, 2017.

ZIP directory

Water reports in Superior

Open a ZIP for site-level provenance and measurements.

ZIP code

51363

Very Hard

316 PPM

Nearest site
69.7 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

Superior Water System

PWSID IA3073001

Surface water
System population served
132
Last reported
Jun 17, 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.

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 Superior

Is the water hard?

The indexed city median is 316 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.