States ›Michigan ›Berrien County ›Three Oaks

Three Oaks, MI Tap Water Quality 2026

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

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

Main Utility: Three Oaks PWSID: MI0006600 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 7.80 ppb, 52% of the action level and no violations are open. PFAS has never been sampled at this system.

B

Three Oaks earns a B for water quality

Graded on violations and lead, with state inspection findings. PFAS not tested.

Lead: 7.80 ppb — 52% of the federal action level
PFAS never sampled at this system
7 violations since 2015, 3 health-based
No violations currently open
Three Oaks's lead level vs. all Michigan community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 7.80 ppb — 52% of the federal action level
✓ Lower lead than 10% of Michigan utilities
Population Served
1396
~833 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
7 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
52% of EPA action level
7.80 ppb
Action level: 15 ppb
The 90th-percentile lead result is 7.80 ppb, 52% 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
Consumer Confidence Rule OTHER — — 2021 Resolved
Consumer Confidence Rule OTHER — — 2018 Resolved
Coliform (TCR) MCL EXCEEDANCE — 5% of samples 2015 Resolved
Coliform (TCR) MCL EXCEEDANCE — 5% of samples 2015 Resolved
E. COLI MONITORING AND REPORTING — 0 2015 Resolved
Coliform (TCR) MCL EXCEEDANCE — 5% of samples 2015 Resolved
Coliform (TCR) MONITORING AND REPORTING — 5% of samples 2015 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

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

About the Main Water System

Utility Three Oaks
PWSID MI0006600
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 1,396
Service connections 833
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Three Oaks tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 7.80 ppb, 52% of the action level.
Does Three Oaks water have PFAS? ▼
This system has never been sampled for PFAS. EPA's national monitoring covered systems serving 3,300 people or more, so no results exist — which is not evidence that none is present.
Who supplies water to Three Oaks? ▼
Three Oaks (PWSID MI0006600). Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2025-01-17. No significant deficiencies were recorded.

What Should Three Oaks 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.

Nearby Cities in Michigan

Lincoln charter, Mi Tap Water Quality 2026 Berrien St. Joseph charter, Mi Tap Water Quality 2026 Berrien Benton Harbor, Mi Tap Water Quality 2026 Berrien Niles, Mi Tap Water Quality 2026 Berrien Niles, Mi Tap Water Quality 2026 Berrien Benton charter, Mi Tap Water Quality 2026 Berrien