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Berlin, MN Tap Water Quality 2026

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

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

Main Utility: Thompson Oaks PWSID: MN1740008 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead was not detected and no violations are open. PFAS has never been sampled at this system.

B

Berlin earns a B for water quality

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

Lead: not detected
PFAS never sampled at this system
18 violations since 2015, 12 health-based
No violations currently open
Berlin's lead level vs. all Minnesota community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: Not detected — 0% of the federal action level
✓ Lower lead than % of Minnesota utilities
Population Served
62
~17 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
18 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
0% of EPA action level
Not detected
Action level: 15 ppb
Lead was not detected at the 90th percentile — the result fell below the laboratory detection limit. That is not the same as an absence of lead in every tap, and older homes with lead service lines can still show higher readings.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 15.9 PCI/L 15 pCi/L 2026 Archived
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 19.5 PCI/L 15 pCi/L 2025 Archived
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 22 PCI/L 15 pCi/L 2025 Archived
Public Notice OTHER — — 2025 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 20 PCI/L 15 pCi/L 2025 Archived
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 23 PCI/L 15 pCi/L 2025 Archived
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 15.6 PCI/L 15 pCi/L 2024 Archived
Gross Alpha, Excl. Radon and U MONITORING AND REPORTING — 15 pCi/L 2023 Resolved
Combined Radium (-226 and -228) MONITORING AND REPORTING — 5 pCi/L 2023 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 17 PCI/L 15 pCi/L 2023 Archived
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 17.3 PCI/L 15 pCi/L 2020 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 18.3 PCI/L 15 pCi/L 2020 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 18.2 PCI/L 15 pCi/L 2020 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 15.3 PCI/L 15 pCi/L 2019 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2019 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2017 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2017 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 16 PCI/L 15 pCi/L 2016 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

18 violations are on record since 2015, of which 12 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Thompson Oaks
PWSID MN1740008
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 62
Service connections 17
Systems serving this area 2
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Berlin tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open.
Does Berlin 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 Berlin? ▼
Thompson Oaks (PWSID MN1740008), one of 2 systems serving this area. Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2025-05-13. No significant deficiencies were recorded.

What Should Berlin 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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