States › North Dakota › Cass County

Cass County, ND Water Quality

Water quality data for 19 public water systems serving Cass County, North Dakota — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 19 water systems · 22 cities
✅
Excellent — All Systems Performing Well

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

A

Cass County Earns a A

Cass County: 22 communities across 19 water systems. 100.0% have no open violations.

  • Median lead where detected: 2.34 ppb
  • 12 communities with a lead detection, 10 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 0 with significant inspection deficiencies
  • 100.0% of communities have no open violations
2.34 ppb
Median Lead Level
County-wide, 90th percentile
19
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
  • Horace
    Not detected
    No federal limits exceeded on record
    B
  • Mapleton
    Not detected
    No federal limits exceeded on record
    B
  • Kindred
    Not detected
    No federal limits exceeded on record
    B
  • Arthur
    Not detected
    No federal limits exceeded on record
    B
  • Oxbow
    Not detected
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • Harwood
    6.72 ppb
    Copper above the 1,300 ppb action level
    C
  • Davenport
    0.73 ppb
    Copper above the 1,300 ppb action level
    B
  • West Fargo
    Not detected
    Copper above the 1,300 ppb action level
    A
  • Argusville
    Not detected
    Copper above the 1,300 ppb action level
    B
  • Hunter
    3.19 ppb
    Copper above the 1,300 ppb action level
    B
County Lead Level — Median 2.34 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2.34 ppb — 15.6% of the federal action level
Systems by Lead Level
Under 5 ppb
10
5 – 10 ppb
1
10 – 15 ppb
1
No Data
10

All Cities in Cass County

Fargo 2.34 ppb A
West Fargo Not detected A
Casselton 12.10 ppb B
Horace Not detected B
Mapleton Not detected B
Kindred Not detected B
Harwood 6.72 ppb C
Argusville Not detected B
Arthur Not detected B
Hunter 3.19 ppb B
Oxbow Not detected A
Davenport 0.73 ppb B
Tower City Not detected B
Buffalo 1.46 ppb B
Grandin 0.82 ppb B
Page Not detected B
Leonard Not detected A
Gardner 2.23 ppb B
Prairie Rose 2.34 ppb A
Amenia 0.61 ppb B
Frontier 2.34 ppb A
Briarwood 2.34 ppb A
Showing 22 cities
No active violations Active violations

About Cass County Drinking Water

Cass County is served by 19 water systems covering 22 communities. No community here has an open violation on record.

Of the communities reporting lead results, 12 recorded a detection, with a median of 2.34 ppb — 16% of the federal action level. 10 reported none detected, which means below the laboratory limit rather than an absence of lead.

No community here has PFAS above the federal limit on record. State inspectors recorded no significant deficiencies.

Frequently Asked Questions

Is Cass County tap water safe to drink?▼
No community in Cass County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Cass County?▼
Among communities with a detection the median is 2.34 ppb, 16% of the 15 ppb action level. 10 reported none detected and 0 reported no result.
How many water systems serve Cass County?▼
19 community water systems serve 22 communities here.
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