States › Montana › Missoula County

Missoula County, MT Water Quality

Water quality data for 8 public water systems serving Missoula County, Montana — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 8 water systems · 13 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

Missoula County Earns a B

Missoula County: 13 communities across 8 water systems. 100.0% have no open violations.

  • Median lead where detected: 22.00 ppb
  • 11 communities with a lead detection, 2 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 0 with significant inspection deficiencies
  • 100.0% of communities have no open violations
22 ppb
Median Lead Level
County-wide, 90th percentile
8
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
  • Lolo
    1.00 ppb
    No federal limits exceeded on record
    B
  • Evaro
    Not detected
    No federal limits exceeded on record
    B
  • Turah
    1.00 ppb
    No federal limits exceeded on record
    B
  • Frenchtown
    Not detected
    1 health-based violation since 2015
    B
  • Clinton
    2.00 ppb
    2 health-based violations since 2015
    B
⚠ Needs Attention
  • Missoula
    22.00 ppb
    Lead above the 15 ppb action level
    C
  • Orchard Homes
    22.00 ppb
    Lead above the 15 ppb action level
    C
  • East Missoula
    22.00 ppb
    Lead above the 15 ppb action level
    C
  • Bonner-West Riverside
    22.00 ppb
    Lead above the 15 ppb action level
    C
  • Wye
    22.00 ppb
    Lead above the 15 ppb action level
    C
County Lead Level — Median 22 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 22 ppb — 146.7% of the federal action level
Systems by Lead Level
Under 5 ppb
5
10 – 15 ppb
6
No Data
2

All Cities in Missoula County

Missoula 22.00 ppb C
Orchard Homes 22.00 ppb C
Lolo 1.00 ppb B
East Missoula 22.00 ppb C
Bonner-West Riverside 22.00 ppb C
Seeley Lake 4.00 ppb B
Wye 22.00 ppb C
Evaro Not detected B
Piltzville 22.00 ppb C
Turah 1.00 ppb B
Clinton 2.00 ppb B
Frenchtown Not detected B
Twin Creeks 2.00 ppb B
Showing 13 cities
No active violations Active violations

About Missoula County Drinking Water

Missoula County is served by 8 water systems covering 13 communities. No community here has an open violation on record.

Of the communities reporting lead results, 11 recorded a detection, with a median of 22.00 ppb — 147% of the federal action level. 2 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 Missoula County tap water safe to drink?▼
No community in Missoula County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Missoula County?▼
Among communities with a detection the median is 22.00 ppb, 147% of the 15 ppb action level. 2 reported none detected and 0 reported no result.
How many water systems serve Missoula County?▼
8 community water systems serve 13 communities here.
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