States › Wisconsin › Pierce County

Pierce County, WI Water Quality

Water quality data for 9 public water systems serving Pierce County, Wisconsin — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 9 water systems · 19 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

Pierce County Earns a B

Pierce County: 19 communities across 9 water systems. 84.2% have no open violations.

  • Median lead where detected: 2.05 ppb
  • 16 communities with a lead detection, 3 reporting none detected
  • 3 communities with PFAS above the federal limit
  • 10 with significant inspection deficiencies
  • 84.2% of communities have no open violations
2.05 ppb
Median Lead Level
County-wide, 90th percentile
9
Water Systems
Active CWS & NTNCWS
84%
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
  • Isabelle
    2.05 ppb
    No federal limits exceeded on record
    B
  • Trenton
    2.15 ppb
    No federal limits exceeded on record
    B
  • Elmwood
    2.30 ppb
    No federal limits exceeded on record
    B
  • Bay City
    2.05 ppb
    No federal limits exceeded on record
    B
  • River Falls
    0.88 ppb
    1 health-based violation since 2015
    A
⚠ Needs Attention
  • Oak Grove
    1.90 ppb
    PFAS above the limit at 2 of 2 sampling points
    D
  • Prescott
    1.90 ppb
    PFAS above the limit at 2 of 2 sampling points
    D
  • Clifton
    1.90 ppb
    PFAS above the limit at 2 of 2 sampling points
    D
  • Trimbelle
    2.40 ppb
    1 violation currently open
    C
  • Ellsworth
    2.40 ppb
    1 violation currently open
    C
County Lead Level — Median 2.05 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2.05 ppb — 13.7% of the federal action level
Systems by Lead Level
Under 5 ppb
16
No Data
3

All Cities in Pierce County

River Falls 0.88 ppb A
Prescott 1.90 ppb D
Ellsworth 2.40 ppb C
Spring Valley Not detected B
Elmwood 2.30 ppb B
Plum City 3.40 ppb B
Clifton 1.90 ppb D
Maiden Rock 0.39 ppb B
Bay City 2.05 ppb B
Ellsworth 2.40 ppb C
River Falls 0.88 ppb A
Union 3.40 ppb B
Oak Grove 1.90 ppb D
Maiden Rock 0.39 ppb B
Spring Lake Not detected B
Isabelle 2.05 ppb B
Trenton 2.15 ppb B
Trimbelle 2.40 ppb C
Gilman Not detected B
Showing 19 cities
No active violations Active violations

About Pierce County Drinking Water

Pierce County is served by 9 water systems covering 19 communities. 84% have no open violations.

Of the communities reporting lead results, 16 recorded a detection, with a median of 2.05 ppb — 14% of the federal action level. 3 reported none detected, which means below the laboratory limit rather than an absence of lead.

3 of 19 communities have PFAS above the limits EPA set in 2024, measured as a running annual average at each sampling point. State inspectors recorded significant deficiencies at 10 of them.

Frequently Asked Questions

Is Pierce County tap water safe to drink?▼
84% of communities have no open violation. 3 of 19 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Pierce County?▼
Among communities with a detection the median is 2.05 ppb, 14% of the 15 ppb action level. 3 reported none detected and 0 reported no result.
How many water systems serve Pierce County?▼
9 community water systems serve 19 communities here.
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