States › Montana › Toole County

Toole County, MT Water Quality

Water quality data for 5 public water systems serving Toole County, Montana — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 5 water systems · 5 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

Toole County Earns a B

Toole County: 5 communities across 5 water systems. 100.0% have no open violations.

  • Median lead where detected: 7.00 ppb
  • 4 communities with a lead detection, 1 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 1 with significant inspection deficiencies
  • 100.0% of communities have no open violations
7 ppb
Median Lead Level
County-wide, 90th percentile
5
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
  • Shelby
    2.00 ppb
    No federal limits exceeded on record
    A
  • Sunburst
    1.00 ppb
    No federal limits exceeded on record
    B
  • Rimrock Colony
    Not detected
    No federal limits exceeded on record
    B
  • Kevin
    12.00 ppb
    2 significant inspection deficiencies
    B
  • Sweet Grass
    15.00 ppb
    Lead above the 15 ppb action level
    D
⚠ Needs Attention
  • Sweet Grass
    15.00 ppb
    Lead above the 15 ppb action level
    D
  • Kevin
    12.00 ppb
    2 significant inspection deficiencies
    B
  • Shelby
    2.00 ppb
    No federal limits exceeded on record
    A
  • Sunburst
    1.00 ppb
    No federal limits exceeded on record
    B
  • Rimrock Colony
    Not detected
    No federal limits exceeded on record
    B
County Lead Level — Median 7 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 7 ppb — 46.7% of the federal action level
Systems by Lead Level
Under 5 ppb
2
10 – 15 ppb
2
No Data
1

All Cities in Toole County

Shelby 2.00 ppb A
Sunburst 1.00 ppb B
Kevin 12.00 ppb B
Rimrock Colony Not detected B
Sweet Grass 15.00 ppb D
Showing 5 cities
No active violations Active violations

About Toole County Drinking Water

Toole County is served by 5 water systems covering 5 communities. No community here has an open violation on record.

Of the communities reporting lead results, 4 recorded a detection, with a median of 7.00 ppb — 47% 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 significant deficiencies at 1 of them.

Frequently Asked Questions

Is Toole County tap water safe to drink?▼
No community in Toole County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Toole County?▼
Among communities with a detection the median is 7.00 ppb, 47% of the 15 ppb action level. 1 reported none detected and 0 reported no result.
How many water systems serve Toole County?▼
5 community water systems serve 5 communities here.
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