States › Wisconsin › Clark County

Clark County, WI Water Quality

Water quality data for 14 public water systems serving Clark County, Wisconsin — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 14 water systems · 24 cities
✅
Excellent — All Systems Performing Well

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

A

Clark County Earns a A

Clark County: 24 communities across 14 water systems. 100.0% have no open violations.

  • Median lead where detected: 1.80 ppb
  • 19 communities with a lead detection, 5 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 0 with significant inspection deficiencies
  • 100.0% of communities have no open violations
1.8 ppb
Median Lead Level
County-wide, 90th percentile
14
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
  • Pine Valley
    1.15 ppb
    No federal limits exceeded on record
    B
  • Warner
    Not detected
    No federal limits exceeded on record
    B
  • Neillsville
    1.15 ppb
    No federal limits exceeded on record
    B
  • Greenwood
    Not detected
    No federal limits exceeded on record
    B
  • Unity
    1.15 ppb
    No federal limits exceeded on record
    B
⚠ Needs Attention
  • Thorp
    14.00 ppb
    Copper above the 1,300 ppb action level
    C
  • Withee
    14.00 ppb
    Copper above the 1,300 ppb action level
    C
  • Hoard
    0.64 ppb
    Copper above the 1,300 ppb action level
    B
  • Abbotsford
    3.50 ppb
    Copper above the 1,300 ppb action level
    B
  • Dorchester
    Not detected
    Copper above the 1,300 ppb action level
    B
County Lead Level — Median 1.8 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 1.8 ppb — 12% of the federal action level
Systems by Lead Level
Under 5 ppb
17
10 – 15 ppb
2
No Data
5

All Cities in Clark County

Neillsville 1.15 ppb B
Abbotsford 3.50 ppb B
Colby 0.95 ppb B
Thorp 14.00 ppb C
Loyal Not detected B
Greenwood Not detected B
Owen 1.80 ppb B
Dorchester Not detected B
Withee 2.30 ppb B
Granton 2.25 ppb B
Curtiss 0.64 ppb B
Mayville 1.78 ppb B
Withee 14.00 ppb C
Unity 1.15 ppb B
Colby 0.95 ppb B
Grant 2.25 ppb B
Pine Valley 1.15 ppb B
Sherman 0.64 ppb B
Loyal Not detected B
Longwood 1.80 ppb B
Warner Not detected B
Hoard 0.64 ppb B
Hixon 2.30 ppb B
York 2.25 ppb B
Showing 24 cities
No active violations Active violations

About Clark County Drinking Water

Clark County is served by 14 water systems covering 24 communities. No community here has an open violation on record.

Of the communities reporting lead results, 19 recorded a detection, with a median of 1.80 ppb — 12% of the federal action level. 5 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 Clark County tap water safe to drink?▼
No community in Clark County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Clark County?▼
Among communities with a detection the median is 1.80 ppb, 12% of the 15 ppb action level. 5 reported none detected and 0 reported no result.
How many water systems serve Clark County?▼
14 community water systems serve 24 communities here.
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