States › Montana › Cascade County

Cascade County, MT Water Quality

Water quality data for 14 public water systems serving Cascade County, Montana — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 14 water systems · 15 cities
✅
Excellent — All Systems Performing Well

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

A

Cascade County Earns a A

Cascade County: 15 communities across 14 water systems. 100.0% have no open violations.

  • Median lead where detected: 2.50 ppb
  • 10 communities with a lead detection, 5 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 1 with significant inspection deficiencies
  • 100.0% of communities have no open violations
2.5 ppb
Median Lead Level
County-wide, 90th percentile
14
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
  • Sun Prairie
    1.00 ppb
    No federal limits exceeded on record
    A
  • Cascade
    2.00 ppb
    No federal limits exceeded on record
    B
  • Belt
    Not detected
    No federal limits exceeded on record
    B
  • Vaughn
    Not detected
    No federal limits exceeded on record
    B
  • Simms
    2.00 ppb
    No federal limits exceeded on record
    B
⚠ Needs Attention
  • Gibson Flats
    12.00 ppb
    5 health-based violations since 2015
    B
  • Great Falls
    12.00 ppb
    5 health-based violations since 2015
    B
  • Neihart
    7.00 ppb
    Copper above the 1,300 ppb action level
    B
  • Malmstrom AFB
    Not detected
    Copper above the 1,300 ppb action level
    B
  • Sand Coulee
    3.00 ppb
    1 significant inspection deficiency
    B
County Lead Level — Median 2.5 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2.5 ppb — 16.7% of the federal action level
Systems by Lead Level
Under 5 ppb
7
5 – 10 ppb
1
10 – 15 ppb
2
No Data
5

All Cities in Cascade County

Great Falls 12.00 ppb B
Malmstrom AFB Not detected B
Sun Prairie 1.00 ppb A
Black Eagle Not detected B
Cascade 2.00 ppb B
Belt Not detected B
Vaughn Not detected B
Simms 2.00 ppb B
Stockett 1.00 ppb B
Pleasant Valley Colony 1.00 ppb B
Tracy Not detected B
Sand Coulee 3.00 ppb B
Ulm 3.00 ppb B
Neihart 7.00 ppb B
Gibson Flats 12.00 ppb B
Showing 15 cities
No active violations Active violations

About Cascade County Drinking Water

Cascade County is served by 14 water systems covering 15 communities. No community here has an open violation on record.

Of the communities reporting lead results, 10 recorded a detection, with a median of 2.50 ppb — 17% of the federal action level. 5 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 significant deficiencies at 1 of them.

Frequently Asked Questions

Is Cascade County tap water safe to drink?▼
No community in Cascade County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Cascade County?▼
Among communities with a detection the median is 2.50 ppb, 17% of the 15 ppb action level. 5 reported none detected and 0 reported no result.
How many water systems serve Cascade County?▼
14 community water systems serve 15 communities here.
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