States › Montana › Gallatin County

Gallatin County, MT Water Quality

Water quality data for 13 public water systems serving Gallatin County, Montana — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 13 water systems · 13 cities
✅
Excellent — All Systems Performing Well

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

A

Gallatin County Earns a A

Gallatin County: 13 communities across 13 water systems. 100.0% have no open violations.

  • Median lead where detected: 2.00 ppb
  • 12 communities with a lead detection, 1 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 ppb
Median Lead Level
County-wide, 90th percentile
13
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
  • Bozeman
    1.60 ppb
    No federal limits exceeded on record
    A
  • Big Sky
    4.84 ppb
    No federal limits exceeded on record
    A
  • Manhattan
    2.00 ppb
    No federal limits exceeded on record
    B
  • King Arthur Park
    1.99 ppb
    No federal limits exceeded on record
    B
  • Churchill
    Not detected
    No federal limits exceeded on record
    B
⚠ Needs Attention
  • Gallatin Gateway
    0.45 ppb
    Copper above the 1,300 ppb action level
    B
  • Four Corners
    3.00 ppb
    Copper above the 1,300 ppb action level
    B
  • Hebgen Lake Estates
    13.00 ppb
    Lead at 13.00 ppb, above a third of the action level
    B
  • Belgrade
    1.79 ppb
    2 health-based violations since 2015
    A
  • Three Forks
    2.00 ppb
    1 health-based violation since 2015
    B
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
10 – 15 ppb
1
No Data
1

All Cities in Gallatin County

Bozeman 1.60 ppb A
Belgrade 1.79 ppb A
Big Sky 4.84 ppb A
Manhattan 2.00 ppb B
Four Corners 3.00 ppb B
Three Forks 2.00 ppb B
West Yellowstone 1.25 ppb A
King Arthur Park 1.99 ppb B
Churchill Not detected B
Hebgen Lake Estates 13.00 ppb B
Gallatin Gateway 0.45 ppb B
Bridger 1.72 ppb B
Amsterdam 4.00 ppb B
Showing 13 cities
No active violations Active violations

About Gallatin County Drinking Water

Gallatin County is served by 13 water systems covering 13 communities. No community here has an open violation on record.

Of the communities reporting lead results, 12 recorded a detection, with a median of 2.00 ppb — 13% of the federal action level. 1 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 Gallatin County tap water safe to drink?▼
No community in Gallatin County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Gallatin County?▼
Among communities with a detection the median is 2.00 ppb, 13% of the 15 ppb action level. 1 reported none detected and 0 reported no result.
How many water systems serve Gallatin County?▼
13 community water systems serve 13 communities here.
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