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City water profile

Decatur water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Decatur, Indiana.

Median indexed hardness

353PPM

One indexed ZIP

Range 352.5–352.5 PPM

State comparison
40 PPM above
State hardness rank
#39 of 386
Matched utilities
3
Active health records
0

City summary

What the indexed records say

Decatur has 1 published ZIP profile across Adams County. The indexed median is 353 PPM, compared with 313 PPM across Indiana.

Among the 386 Indianacities with an indexed median, Decatur ranks #39from highest to lowest. Across all 472 state ZIP profiles, available estimates run from 132to 371 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
44.1 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 0Low: 1

Observation window: Jun 20, 2016 to Sep 10, 2025.

ZIP directory

Water reports in Decatur

Open a ZIP for site-level provenance and measurements.

ZIP code

46733

Very Hard

352.5 PPM

Nearest site
44.1 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

Decatur Water Department

PWSID IN5201002

Groundwater
System population served
9,900
Last reported
Jun 30, 2026

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

Oakwood Community Association, Inc.

PWSID IN5201009

Groundwater
System population served
210
Last reported
Jun 30, 2026

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

Riverbend Estates

PWSID IN5201006

Groundwater
System population served
50
Last reported
Jun 30, 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
Radium-226IN5201006Jan 1, 2026Archived
Radium-228IN5201006Jan 1, 2026Archived
Gross Alpha, Excl. Radon and UIN5201006Jan 1, 2026Archived
Consumer Confidence RuleIN5201006Oct 1, 2025Resolved
Revised Total Coliform RuleIN5201006Jul 1, 2025Resolved
Consumer Confidence RuleIN5201006Jul 1, 2025Unaddressed
Lead and Copper RuleIN5201006Jan 1, 2024Resolved
Revised Total Coliform RuleIN5201009Oct 1, 2023Resolved · health-based
Groundwater RuleIN5201006Jan 21, 2022Resolved · health-based
Groundwater RuleIN5201006Jan 21, 2022Resolved · 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 Decatur

Is the water hard?

The indexed city median is 353 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.