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City water profile

Rexburg water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Rexburg, Idaho.

Median indexed hardness

181PPM

2 indexed ZIPs

Range 181–181 PPM

State comparison
13 PPM above
State hardness rank
#30 of 67
Matched utilities
3
Active health records
0

City summary

What the indexed records say

Rexburg has 2 published ZIP profiles across Madison County. The indexed median is 181 PPM, compared with 168 PPM across Idaho.

Among the 67 Idahocities with an indexed median, Rexburg ranks #30from highest to lowest. Across all 78 state ZIP profiles, available estimates run from 22.2to 339 PPM.

The 181–181 PPM range shows how much the available ZIP estimates vary within the city label. 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 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
25.3 miles
Profiles with evidence
2/2

Confidence labels

High: 0Moderate: 1Low: 1

Observation window: Apr 11, 2016 to Jun 18, 2026.

ZIP directory

Water reports in Rexburg

Open a ZIP for site-level provenance and measurements.

ZIP code

83440

Very Hard

181 PPM

Nearest site
24.4 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

83460

Very Hard

181 PPM

Nearest site
25.3 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

Rexburg City Of

PWSID ID7330022

Groundwater
System population served
40,695
Last reported
Jun 26, 2026

A municipal system, in-state city, and served county all agree with this Census ZCTA.

Hillview Subd

PWSID ID7330011

Groundwater
System population served
50
Last reported
Jun 26, 2026

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

Syringa Park Subd

PWSID ID7330028

Groundwater
System population served
35
Last reported
Jun 26, 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
Lead and Copper RuleID7330028Dec 30, 2023Unaddressed
Revised Total Coliform RuleID7330011Mar 1, 2023Resolved
GlyphosateID7330022Jan 1, 2023Archived
Di(2-ethylhexyl) adipateID7330022Jan 1, 2023Archived
OXAMYLID7330022Jan 1, 2023Archived
Di(2-ethylhexyl) phthalateID7330022Jan 1, 2023Archived
DinosebID7330022Jan 1, 2023Archived
AtrazineID7330022Jan 1, 2023Archived
2,4,5-TPID7330022Jan 1, 2023Archived
HEXACHLOROBENZENEID7330022Jan 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 Rexburg

Is the water hard?

The indexed city median is 181 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.