States › Michigan › Monroe County

Monroe County, MI Water Quality

Water quality data for 9 public water systems serving Monroe County, Michigan — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 9 water systems · 18 cities
✅
Excellent — All Systems Performing Well

Water quality across the county is outstanding with minimal violations and very low lead levels.

A

Monroe County Earns a A

Monroe County: 18 communities across 9 water systems. 100.0% have no open violations.

  • Median lead where detected: 2.00 ppb
  • 13 communities with a lead detection, 4 reporting none detected
  • 1 communities with PFAS above the federal limit
  • 1 with significant inspection deficiencies
  • 100.0% of communities have no open violations
2 ppb
Median Lead Level
County-wide, 90th percentile
9
Water Systems
Active CWS & NTNCWS
100%
Violation-Free
No active violations on record
How we grade counties: MyWaterIQ uses EPA SDWIS enforcement data — actual MCL violations and lead test results — not the aspirational MCLG targets used by some sites. A grade reflects real compliance history, not theoretical risk. Learn more →

Cities by Water Quality

⭐ Best Performing
  • Frenchtown
    1.90 ppb
    No federal limits exceeded on record
    A
  • Berlin charter
    Not detected
    No federal limits exceeded on record
    A
  • Bedford
    1.00 ppb
    2 health-based violations since 2015
    A
  • Monroe
    2.00 ppb
    1 health-based violation since 2015
    A
  • Monroe charter
    2.00 ppb
    1 health-based violation since 2015
    A
⚠ Needs Attention
  • Dundee
    Not detected
    PFAS above the limit at 1 of 1 sampling points
    C
  • Petersburg
    Not detected
    Copper above the 1,300 ppb action level
    B
  • Whiteford
    Not reported
    1 significant inspection deficiency
    B
  • Summerfield
    Not detected
    Copper above the 1,300 ppb action level
    B
  • Ash
    7.60 ppb
    Lead at 7.60 ppb, above a third of the action level
    A
County Lead Level — Median 2 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2 ppb — 13.3% of the federal action level
Systems by Lead Level
Under 5 ppb
11
5 – 10 ppb
2
No Data
5

All Cities in Monroe County

Bedford 1.00 ppb A
Monroe 2.00 ppb A
Monroe charter 2.00 ppb A
Frenchtown 1.90 ppb A
Raisinville 2.00 ppb A
Dundee Not detected C
Berlin charter Not detected A
Exeter 2.00 ppb A
Ash 7.60 ppb A
Erie 1.00 ppb A
Petersburg Not detected B
Ida 2.00 ppb A
Ida 2.00 ppb A
London 2.00 ppb A
La Salle 2.00 ppb A
Whiteford Not reported B
Milan 5.10 ppb A
Summerfield Not detected B
Showing 18 cities
No active violations Active violations

About Monroe County Drinking Water

Monroe County is served by 9 water systems covering 18 communities. No community here has an open violation on record.

Of the communities reporting lead results, 13 recorded a detection, with a median of 2.00 ppb — 13% of the federal action level. 4 reported none detected, which means below the laboratory limit rather than an absence of lead.

1 of 18 communities have PFAS above the limits EPA set in 2024, measured as a running annual average at each sampling point. State inspectors recorded significant deficiencies at 1 of them.

Frequently Asked Questions

Is Monroe County tap water safe to drink?▼
No community in Monroe County has an open violation on record. 1 of 18 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Monroe County?▼
Among communities with a detection the median is 2.00 ppb, 13% of the 15 ppb action level. 4 reported none detected and 1 reported no result.
How many water systems serve Monroe County?▼
9 community water systems serve 18 communities here.
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