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Princeton, IL Tap Water Quality 2026

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

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

Main Utility: Princeton PWSID: IL0110850 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 3.10 ppb, 21% of the action level and no violations are open. No PFAS was detected.

B

Princeton earns a B for water quality

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

Lead: 3.10 ppb — 21% of the federal action level
PFAS tested, none detected
3 violations since 2015, 2 health-based
No violations currently open
Princeton's lead level vs. all Illinois community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 3.10 ppb — 21% of the federal action level
✓ Lower lead than 44% of Illinois utilities
Population Served
7685
~3810 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
3 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
21% of EPA action level
3.10 ppb
Action level: 15 ppb
The 90th-percentile lead result is 3.10 ppb, 21% 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 REVISIONS REPORTING FAILURE — — 2025 Resolved
Lead and Copper Rule TREATMENT TECHNIQUE — TT 2019 Resolved
Chlorine DISINFECTANT LEVEL — 4.0 mg/L 2019 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

3 violations are on record since 2015, of which 2 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Princeton
PWSID IL0110850
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 7,685
Service connections 3,810
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Princeton tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 3.10 ppb, 21% of the action level.
Does Princeton water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Princeton? ▼
Princeton (PWSID IL0110850). Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2025-09-04. Inspectors recorded 2 significant deficiencies.

What Should Princeton Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
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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