States › Wisconsin › Dodge County

Dodge County, WI Water Quality

Water quality data for 25 public water systems serving Dodge County, Wisconsin — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 25 water systems · 36 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

Dodge County Earns a B

Dodge County: 36 communities across 25 water systems. 97.2% have no open violations.

  • Median lead where detected: 1.93 ppb
  • 34 communities with a lead detection, 2 reporting none detected
  • 1 communities with PFAS above the federal limit
  • 7 with significant inspection deficiencies
  • 97.2% of communities have no open violations
1.93 ppb
Median Lead Level
County-wide, 90th percentile
25
Water Systems
Active CWS & NTNCWS
97%
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
  • Waupun
    1.20 ppb
    No federal limits exceeded on record
    A
  • Mayville
    3.30 ppb
    No federal limits exceeded on record
    A
  • Iron Ridge
    2.80 ppb
    No federal limits exceeded on record
    B
  • Chester
    1.20 ppb
    No federal limits exceeded on record
    A
  • Calamus
    0.13 ppb
    No federal limits exceeded on record
    B
⚠ Needs Attention
  • Juneau
    2.70 ppb
    1 violation currently open
    D
  • Leroy
    2.55 ppb
    3 significant inspection deficiencies
    C
  • Lebanon
    Not detected
    Copper above the 1,300 ppb action level
    C
  • Rubicon
    0.86 ppb
    PFAS above the limit at 2 of 5 sampling points
    B
  • Theresa
    0.67 ppb
    1 significant inspection deficiency
    B
County Lead Level — Median 1.93 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 1.93 ppb — 12.9% of the federal action level
Systems by Lead Level
Under 5 ppb
28
5 – 10 ppb
3
10 – 15 ppb
3
No Data
2

All Cities in Dodge County

Beaver Dam 11.30 ppb A
Waupun 1.20 ppb A
Mayville 3.30 ppb A
Horicon 3.20 ppb A
Juneau 2.70 ppb D
Lomira 8.20 ppb B
Randolph 1.30 ppb B
Fox Lake 0.79 ppb B
Fox Lake Not detected B
Theresa 0.67 ppb B
Hustisford 0.37 ppb B
Iron Ridge 2.80 ppb B
Beaver Dam 11.30 ppb A
Reeseville 4.88 ppb B
Brownsville 0.49 ppb B
Clyman 3.33 ppb B
Emmet 11.00 ppb A
Chester 1.20 ppb A
Lowell 0.30 ppb B
Hustisford 0.37 ppb B
Leroy 2.55 ppb C
Calamus 0.13 ppb B
Elba 8.88 ppb B
Portland 1.30 ppb B
Hubbard 0.15 ppb B
Westford 1.30 ppb B
Lebanon Not detected C
Kekoskee 3.30 ppb A
Lowell 0.30 ppb B
Lomira 8.20 ppb B
Oak Grove 3.20 ppb A
Rubicon 0.86 ppb B
Theresa 0.67 ppb B
Trenton 0.39 ppb B
Clyman 3.33 ppb B
Burnett 3.20 ppb A
Showing 36 cities
No active violations Active violations

About Dodge County Drinking Water

Dodge County is served by 25 water systems covering 36 communities. 97% have no open violations.

Of the communities reporting lead results, 34 recorded a detection, with a median of 1.93 ppb — 13% of the federal action level. 2 reported none detected, which means below the laboratory limit rather than an absence of lead.

1 of 36 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 7 of them.

Frequently Asked Questions

Is Dodge County tap water safe to drink?▼
97% of communities have no open violation. 1 of 36 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Dodge County?▼
Among communities with a detection the median is 1.93 ppb, 13% of the 15 ppb action level. 2 reported none detected and 0 reported no result.
How many water systems serve Dodge County?▼
25 community water systems serve 36 communities here.
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