States › Wisconsin › Vernon County

Vernon County, WI Water Quality

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

📅 2026 Report 🔄 Data updated 2026 Q2 📍 13 water systems · 20 cities
✅
Excellent — All Systems Performing Well

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

A

Vernon County Earns a A

Vernon County: 20 communities across 13 water systems. 95.0% have no open violations.

  • Median lead where detected: 2.11 ppb
  • 14 communities with a lead detection, 6 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 2 with significant inspection deficiencies
  • 95.0% of communities have no open violations
2.11 ppb
Median Lead Level
County-wide, 90th percentile
13
Water Systems
Active CWS & NTNCWS
95%
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
  • Stark
    Not detected
    No federal limits exceeded on record
    B
  • Hamburg
    2.76 ppb
    No federal limits exceeded on record
    B
  • Liberty
    1.22 ppb
    No federal limits exceeded on record
    B
  • Viroqua
    4.42 ppb
    No federal limits exceeded on record
    A
  • La Farge
    Not detected
    No federal limits exceeded on record
    B
⚠ Needs Attention
  • Genoa
    7.83 ppb
    1 violation currently open
    D
  • Hillsboro
    3.20 ppb
    Copper above the 1,300 ppb action level
    C
  • Coon Valley
    Not detected
    1 significant inspection deficiency
    B
  • Coon
    Not detected
    1 significant inspection deficiency
    B
  • Stoddard
    Not detected
    3 health-based violations since 2015
    B
County Lead Level — Median 2.11 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2.11 ppb — 14.1% of the federal action level
Systems by Lead Level
Under 5 ppb
13
5 – 10 ppb
1
No Data
6

All Cities in Vernon County

Viroqua 4.42 ppb A
Westby 1.46 ppb B
Hillsboro 3.20 ppb C
La Farge Not detected B
Coon Valley Not detected B
Stoddard Not detected B
Ontario 1.27 ppb B
Readstown 1.46 ppb B
Chaseburg 2.76 ppb B
Genoa 7.83 ppb D
Viroqua 4.42 ppb A
Hillsboro 0.84 ppb B
Genoa 3.40 ppb B
Bergen Not detected B
Coon Not detected B
Stark Not detected B
Liberty 1.22 ppb B
Kickapoo 1.46 ppb B
Hamburg 2.76 ppb B
Christiana 1.46 ppb B
Showing 20 cities
No active violations Active violations

About Vernon County Drinking Water

Vernon County is served by 13 water systems covering 20 communities. 95% have no open violations.

Of the communities reporting lead results, 14 recorded a detection, with a median of 2.11 ppb — 14% of the federal action level. 6 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 2 of them.

Frequently Asked Questions

Is Vernon County tap water safe to drink?▼
95% of communities have no open violation. No community has PFAS above the federal limit on record.
What is the lead level in Vernon County?▼
Among communities with a detection the median is 2.11 ppb, 14% of the 15 ppb action level. 6 reported none detected and 0 reported no result.
How many water systems serve Vernon County?▼
13 community water systems serve 20 communities here.
← Back to Wisconsin water quality overview