States › Minnesota › Sibley County

Sibley County, MN Water Quality

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

📅 2026 Report 🔄 Data updated 2026 Q2 📍 8 water systems · 18 cities
✅
Excellent — All Systems Performing Well

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

A

Sibley County Earns a A

Sibley County: 18 communities across 8 water systems. 100.0% have no open violations.

  • Median lead where detected: 2.00 ppb
  • 15 communities with a lead detection, 3 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
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
  • Green Isle
    2.00 ppb
    No federal limits exceeded on record
    B
  • Washington Lake
    2.00 ppb
    No federal limits exceeded on record
    B
  • Green Isle
    2.00 ppb
    No federal limits exceeded on record
    B
  • Winthrop
    3.00 ppb
    1 health-based violation since 2015
    B
  • Transit
    3.00 ppb
    1 health-based violation since 2015
    B
⚠ Needs Attention
  • Bismarck
    Not detected
    15 health-based violations since 2015
    B
  • New Auburn
    1.00 ppb
    Copper above the 1,300 ppb action level
    B
  • Gaylord
    2.00 ppb
    Copper above the 1,300 ppb action level
    B
  • Arlington
    3.00 ppb
    Copper above the 1,300 ppb action level
    A
  • Henderson
    Not detected
    Copper above the 1,300 ppb action level
    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
15
No Data
3

All Cities in Sibley County

Gaylord 2.00 ppb B
Arlington 3.00 ppb A
Winthrop 3.00 ppb B
Henderson Not detected B
Gibbon 1.00 ppb B
Green Isle 2.00 ppb B
New Auburn 1.00 ppb B
Bismarck Not detected B
Arlington 3.00 ppb A
Transit 3.00 ppb B
Henderson Not detected B
Alfsborg 3.00 ppb B
Dryden 2.00 ppb B
Severance 1.00 ppb B
Cornish 3.00 ppb B
Green Isle 2.00 ppb B
New Auburn 1.00 ppb B
Washington Lake 2.00 ppb B
Showing 18 cities
No active violations Active violations

About Sibley County Drinking Water

Sibley County is served by 8 water systems covering 18 communities. No community here has an open violation on record.

Of the communities reporting lead results, 15 recorded a detection, with a median of 2.00 ppb — 13% of the federal action level. 3 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 Sibley County tap water safe to drink?▼
No community in Sibley County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Sibley County?▼
Among communities with a detection the median is 2.00 ppb, 13% of the 15 ppb action level. 3 reported none detected and 0 reported no result.
How many water systems serve Sibley County?▼
8 community water systems serve 18 communities here.
← Back to Minnesota water quality overview