States › Wisconsin › Iowa County

Iowa County, WI Water Quality

Water quality data for 15 public water systems serving Iowa County, Wisconsin — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 15 water systems · 23 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

Iowa County Earns a B

Iowa County: 23 communities across 15 water systems. 100.0% have no open violations.

  • Median lead where detected: 2.71 ppb
  • 12 communities with a lead detection, 11 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 6 with significant inspection deficiencies
  • 100.0% of communities have no open violations
2.71 ppb
Median Lead Level
County-wide, 90th percentile
15
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
  • Moscow
    Not detected
    No federal limits exceeded on record
    B
  • Highland
    Not detected
    No federal limits exceeded on record
    B
  • Dodgeville
    1.40 ppb
    No federal limits exceeded on record
    B
  • Highland
    Not detected
    No federal limits exceeded on record
    B
  • Arena
    1.10 ppb
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • Mineral Point
    37.00 ppb
    Lead above the 15 ppb action level
    D
  • Mineral Point
    37.00 ppb
    Lead above the 15 ppb action level
    D
  • Barneveld
    1.90 ppb
    2 significant inspection deficiencies
    C
  • Brigham
    1.90 ppb
    2 significant inspection deficiencies
    C
  • Pulaski
    Not detected
    1 significant inspection deficiency
    B
County Lead Level — Median 2.71 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2.71 ppb — 18.1% of the federal action level
Systems by Lead Level
Under 5 ppb
9
5 – 10 ppb
1
10 – 15 ppb
2
No Data
11

All Cities in Iowa County

Dodgeville 1.40 ppb B
Mineral Point 37.00 ppb D
Barneveld 1.90 ppb C
Highland Not detected B
Arena 1.10 ppb A
Ridgeway 3.48 ppb B
Linden 4.33 ppb B
Avoca Not detected B
Cobb Not detected B
Hollandale Not detected B
Rewey Not detected B
Mineral Point 37.00 ppb D
Arena 1.94 ppb B
Linden Not detected B
Ridgeway 3.48 ppb B
Brigham 1.90 ppb C
Dodgeville 1.40 ppb B
Eden Not detected B
Wyoming 9.35 ppb B
Mifflin Not detected B
Highland Not detected B
Moscow Not detected B
Pulaski Not detected B
Showing 23 cities
No active violations Active violations

About Iowa County Drinking Water

Iowa County is served by 15 water systems covering 23 communities. No community here has an open violation on record.

Of the communities reporting lead results, 12 recorded a detection, with a median of 2.71 ppb — 18% of the federal action level. 11 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 6 of them.

Frequently Asked Questions

Is Iowa County tap water safe to drink?▼
No community in Iowa County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Iowa County?▼
Among communities with a detection the median is 2.71 ppb, 18% of the 15 ppb action level. 11 reported none detected and 0 reported no result.
How many water systems serve Iowa County?▼
15 community water systems serve 23 communities here.
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