States › Minnesota › Mahnomen County

Mahnomen County, MN Water Quality

Water quality data for 4 public water systems serving Mahnomen County, Minnesota — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 4 water systems · 11 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

Mahnomen County Earns a B

Mahnomen County: 11 communities across 4 water systems. 81.8% have no open violations.

  • Median lead where detected: none detected
  • 0 communities with a lead detection, 11 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 2 with significant inspection deficiencies
  • 81.8% of communities have no open violations
—
Median Lead Level
County-wide, 90th percentile
4
Water Systems
Active CWS & NTNCWS
81%
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
  • Bejou
    Not detected
    No federal limits exceeded on record
    B
  • Marsh Creek
    Not detected
    No federal limits exceeded on record
    B
  • Mahnomen
    Not detected
    No federal limits exceeded on record
    B
  • Pembina
    Not detected
    No federal limits exceeded on record
    B
  • Riverland
    Not detected
    No federal limits exceeded on record
    B
⚠ Needs Attention
  • Twin Lakes
    Not detected
    Copper above the 1,300 ppb action level
    D
  • Twin Lakes
    Not detected
    Copper above the 1,300 ppb action level
    D
  • Lake Grove
    Not detected
    Copper above the 1,300 ppb action level
    B
  • Popple Grove
    Not detected
    Copper above the 1,300 ppb action level
    B
  • Waubun
    Not detected
    Copper above the 1,300 ppb action level
    B

All Cities in Mahnomen County

Mahnomen Not detected B
Waubun Not detected B
Pembina Not detected B
Riverland Not detected B
Twin Lakes Not detected D
Bejou Not detected B
Twin Lakes Not detected D
Bejou Not detected B
Marsh Creek Not detected B
Popple Grove Not detected B
Lake Grove Not detected B
Showing 11 cities
No active violations Active violations

About Mahnomen County Drinking Water

Mahnomen County is served by 4 water systems covering 11 communities. 82% have no open violations.

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

No community here has PFAS above the federal limit on record. State inspectors recorded significant deficiencies at 2 of them.

Frequently Asked Questions

Is Mahnomen County tap water safe to drink?▼
82% of communities have no open violation. No community has PFAS above the federal limit on record.
What is the lead level in Mahnomen County?▼
No community reported a lead detection.
How many water systems serve Mahnomen County?▼
4 community water systems serve 11 communities here.
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