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Arlington Heights, IL Tap Water Quality 2026

Water quality report for Arlington Heights, IL — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Arlington Heights's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Arlington Heights PWSID: IL0314030 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 8.83 ppb, 59% of the action level and no violations are open. No PFAS was detected.

B

Arlington Heights earns a B for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: 8.83 ppb — 59% of the federal action level
PFAS tested, none detected
25 violations since 2015, 0 health-based
No violations currently open
Arlington Heights's lead level vs. all Illinois community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 8.83 ppb — 59% of the federal action level
✓ Lower lead than 13% of Illinois utilities
Population Served
75880
~20539 connections
Water Source
Surface water
Purchased from another system — SDWIS source code SWP
Active Violations
0
25 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
59% of EPA action level
8.83 ppb
Action level: 15 ppb
The 90th-percentile lead result is 8.83 ppb, 59% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Public Notice OTHER — — 2026 Unaddressed
Public Notice OTHER — — 2026 Unaddressed
Consumer Confidence Rule OTHER — — 2025 Unaddressed
Vinyl chloride MONITORING AND REPORTING — 0.002 mg/L 2024 Resolved
1,2,4-Trichlorobenzene MONITORING AND REPORTING — 0.07 mg/L 2024 Resolved
cis-1,2-Dichloroethylene MONITORING AND REPORTING — 0.07 mg/L 2024 Resolved
Xylenes, Total MONITORING AND REPORTING — 10 mg/L 2024 Resolved
DICHLOROMETHANE MONITORING AND REPORTING — 0.005 mg/L 2024 Resolved
o-Dichlorobenzene MONITORING AND REPORTING — 0.6 mg/L 2024 Resolved
p-Dichlorobenzene MONITORING AND REPORTING — 0.075 mg/L 2024 Resolved
1,1-Dichloroethylene MONITORING AND REPORTING — 0.007 mg/L 2024 Resolved
trans-1,2-Dichloroethylene MONITORING AND REPORTING — 0.1 mg/L 2024 Resolved
1,2-Dichloroethane MONITORING AND REPORTING — 0.005 mg/L 2024 Resolved
1,1,1-Trichloroethane MONITORING AND REPORTING — 0.2 mg/L 2024 Resolved
Carbon tetrachloride MONITORING AND REPORTING — 0.005 mg/L 2024 Resolved
1,2-Dichloropropane MONITORING AND REPORTING — 0.005 mg/L 2024 Resolved
Trichloroethylene MONITORING AND REPORTING — 0.005 mg/L 2024 Resolved
1,1,2-Trichloroethane MONITORING AND REPORTING — 0.005 mg/L 2024 Resolved
Tetrachloroethylene MONITORING AND REPORTING — 0.005 mg/L 2024 Resolved
CHLOROBENZENE MONITORING AND REPORTING — 0.1 mg/L 2024 Resolved
Benzene MONITORING AND REPORTING — 0.005 mg/L 2024 Resolved
Toluene MONITORING AND REPORTING — 1 mg/L 2024 Resolved
Ethylbenzene MONITORING AND REPORTING — 0.7 mg/L 2024 Resolved
Styrene MONITORING AND REPORTING — 0.1 mg/L 2024 Resolved
Consumer Confidence Rule OTHER — — 2021 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

25 violations are on record since 2015, of which 0 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Arlington Heights
PWSID IL0314030
Water source Surface water — Purchased from another system — SDWIS source code SWP
Population served 75,880
Service connections 20,539
Systems serving this area 6
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Arlington Heights tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 8.83 ppb, 59% of the action level.
Does Arlington Heights water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Arlington Heights? ▼
Arlington Heights (PWSID IL0314030), one of 6 systems serving this area. Surface water. Purchased from another system — SDWIS source code SWP
When was this system last inspected? ▼
It was last inspected on 2024-04-02. Inspectors recorded 1 significant deficiency.

What Should Arlington Heights Residents Do?

1
Consider a filter certified for lead
Look for NSF/ANSI 53 certification for lead reduction.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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