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Bannockburn, IL Tap Water Quality 2026

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

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

Main Utility: Lake Forest PWSID: IL0970800 Updated: 2026 Q2
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Lead above the federal action level

Lead is 28.00 ppb, 187% of the action level and no violations are open. No PFAS was detected.

C

Bannockburn earns a C for water quality

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

Lead: 28.00 ppb — 187% of the federal action level
PFAS tested, none detected
4 violations since 2015, 0 health-based
No violations currently open
Bannockburn's lead level vs. all Illinois community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 28.00 ppb — 100% of the federal action level
✓ Lower lead than 1% of Illinois utilities
Population Served
17
~6925 connections
Water Source
Surface water
Drawn from surface water — SDWIS source code SW
Active Violations
0
4 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
100% of EPA action level
28.00 ppb
Action level: 15 ppb
The 90th-percentile lead result is 28.00 ppb, 187% 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
Lead and Copper Rule MONITORING AND REPORTING — TT 2023 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2019 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2019 Resolved
Consumer Confidence Rule OTHER — — 2017 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

4 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 Lake Forest
PWSID IL0970800
Water source Surface water — Drawn from surface water — SDWIS source code SW
Population served 17
Service connections 6,925
Systems serving this area 2
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Bannockburn tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 28.00 ppb, 187% of the action level.
Does Bannockburn water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Bannockburn? ▼
Lake Forest (PWSID IL0970800), one of 2 systems serving this area. Surface water. Drawn from surface water — SDWIS source code SW
When was this system last inspected? ▼
It was last inspected on 2025-10-03. Inspectors recorded 1 significant deficiency.

What Should Bannockburn 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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