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City water profile

Fairfield water quality

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

Median indexed hardness

274PPM

2 indexed ZIPs

Range 274–274 PPM

State comparison
7 PPM below
State hardness rank
#392 of 683
Matched utilities
3
Active health records
0

City summary

What the indexed records say

Fairfield has 2 published ZIP profiles across Jefferson County. The indexed median is 274 PPM, compared with 281 PPM across Iowa.

Among the 683 Iowacities with an indexed median, Fairfield ranks #392from highest to lowest. Across all 723 state ZIP profiles, available estimates run from 182to 834 PPM.

The 274–274 PPM range shows how much the available ZIP estimates vary within the city label.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs
Moderately hard0 ZIPs
Hard0 ZIPs
Very hard2 ZIPs

2 of 2 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
6.4 miles
Profiles with evidence
2/2

Confidence labels

High: 0Moderate: 2Low: 0

Observation window: Feb 9, 2016 to Mar 3, 2026.

ZIP directory

Water reports in Fairfield

Open a ZIP for site-level provenance and measurements.

ZIP code

52556

Very Hard

274 PPM

Nearest site
6.3 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

52557

Very Hard

274 PPM

Nearest site
6.4 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Fairfield Water Supply

PWSID IA5131033

Groundwater
System population served
9,821
Last reported
Jun 17, 2026

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

Jefferson County Rural Water District

PWSID IA5131705

Surface water
System population served
468
Last reported
Jun 17, 2026

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

Fairfield Estates Mobile Home Park

PWSID IA5131302

Groundwater
System population served
140
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.

RecordSystemPeriodStatus
Consumer Confidence RuleIA5131705Jul 1, 2024Resolved
Public NoticeIA5131705May 30, 2024Unaddressed
Public NoticeIA5131705Apr 22, 2024Unaddressed
Revised Total Coliform RuleIA5131705Jan 1, 2024Resolved
Revised Total Coliform RuleIA5131705Dec 1, 2023Resolved
Combined Radium (-226 and -228)IA5131033Jan 1, 2023Archived

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 Fairfield

Is the water hard?

The indexed city median is 274 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.