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City water profile

Arlington Heights water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Arlington Heights, Illinois.

Median indexed hardness

251PPM

2 indexed ZIPs

Range 247–254 PPM

State comparison
34 PPM below
State hardness rank
#698 of 913
Matched utilities
1
Active health records
0

City summary

What the indexed records say

Arlington Heights has 2 published ZIP profiles across Cook County. The indexed median is 251 PPM, compared with 285 PPM across Illinois.

Among the 913 Illinoiscities with an indexed median, Arlington Heights ranks #698from highest to lowest. Across all 1,065 state ZIP profiles, available estimates run from 115to 408 PPM.

The 247–254 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
15.9 miles
Profiles with evidence
2/2

Confidence labels

High: 0Moderate: 2Low: 0

Observation window: Apr 12, 2016 to Apr 22, 2026.

ZIP directory

Water reports in Arlington Heights

Open a ZIP for site-level provenance and measurements.

ZIP code

60004

Very Hard

254 PPM

Nearest site
15.9 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

60005

Very Hard

247 PPM

Nearest site
15.8 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Arlington Heights

PWSID IL0314030

Surface water
System population served
73,320
Last reported
May 27, 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
Public NoticeIL0314030Jan 14, 2026Unaddressed
Public NoticeIL0314030Jan 14, 2026Unaddressed
Consumer Confidence RuleIL0314030Jul 1, 2025Unaddressed
1,2,4-TrichlorobenzeneIL0314030Jan 1, 2024Resolved
p-DichlorobenzeneIL0314030Jan 1, 2024Resolved
1,1-DichloroethyleneIL0314030Jan 1, 2024Resolved
trans-1,2-DichloroethyleneIL0314030Jan 1, 2024Resolved
1,2-DichloroethaneIL0314030Jan 1, 2024Resolved
1,1,1-TrichloroethaneIL0314030Jan 1, 2024Resolved
Carbon tetrachlorideIL0314030Jan 1, 2024Resolved

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 Arlington Heights

Is the water hard?

The indexed city median is 251 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.