States › Minnesota › Cook County

Cook County, MN Water Quality

Water quality data for 1 public water systems serving Cook County, Minnesota — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 1 water systems · 1 cities
✅
Generally Safe — Most Systems Performing Well

The majority of water systems have no active violations and lead levels well below the federal action level.

B

Cook County Earns a B

Cook County: 1 community across 1 water system. 100.0% have no open violations.

  • Median lead where detected: none detected
  • 0 communities with a lead detection, 1 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 1 with significant inspection deficiencies
  • 100.0% of communities have no open violations
—
Median Lead Level
County-wide, 90th percentile
1
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
  • Grand Marais
    Not detected
    3 significant inspection deficiencies
    B
⚠ Needs Attention
  • Grand Marais
    Not detected
    3 significant inspection deficiencies
    B

All Cities in Cook County

Grand Marais Not detected B
Showing 1 cities
No active violations Active violations

About Cook County Drinking Water

Cook County is served by 1 water system covering 1 community. No community here has an open violation on record.

Lead was not detected in any community in Cook County that reported a result.

No community here has PFAS above the federal limit on record. State inspectors recorded significant deficiencies at 1 of them.

Frequently Asked Questions

Is Cook County tap water safe to drink?▼
No community in Cook County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Cook County?▼
No community reported a lead detection.
How many water systems serve Cook County?▼
1 community water system serves 1 community here.
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