Jefferson, WI
Contamination score
Higher = more contaminated vs. other cities.
Reported illness & cancer claims
No claims reported yet. Be the first to add one.
Claims are aggregated from public records and community reports and may be unverified. If you believe your illness is linked to local water, request a consultation.
Self-reported issues
No issues reported yet. Be the first to report one.

Public water systems
Jefferson Waterworks
- PWSID:
- WI1280104
- Source:
- Ground water
- Serves:
- 7,926 people
EPA & DEP violations
Lead and Copper Rule — MR violation
medium severityResolvedLead and Copper Rule MR violation (Resolved).
EPA SDWIS · MR · Began Oct 1, 2024 · 1 year ago · Source ↗
Combined Radium (-226 and -228) — MCL violation
high severityHealth-basedArchivedCombined Radium (-226 and -228) MCL violation (Archived).
EPA SDWIS · MCL · Began Apr 1, 2024 · 2 years ago · Source ↗
Combined Radium (-226 and -228) — MCL violation
high severityHealth-basedArchivedCombined Radium (-226 and -228) MCL violation (Archived).
EPA SDWIS · MCL · Began Jan 1, 2024 · 2 years ago · Source ↗
Combined Radium (-226 and -228) — MCL violation
high severityHealth-basedArchivedCombined Radium (-226 and -228) MCL violation (Archived).
EPA SDWIS · MCL · Began Oct 1, 2023 · 2 years ago · Source ↗
Combined Radium (-226 and -228) — MCL violation
high severityHealth-basedArchivedCombined Radium (-226 and -228) MCL violation (Archived).
EPA SDWIS · MCL · Began Jul 1, 2023 · 2 years ago · Source ↗
Combined Radium (-226 and -228) — MCL violation
high severityHealth-basedArchivedCombined Radium (-226 and -228) MCL violation (Archived).
EPA SDWIS · MCL · Began Apr 1, 2023 · 3 years ago · Source ↗
Combined Radium (-226 and -228) — MCL violation
high severityHealth-basedArchivedCombined Radium (-226 and -228) MCL violation (Archived).
EPA SDWIS · MCL · Began Jan 1, 2023 · 3 years ago · Source ↗
Combined Radium (-226 and -228) — MCL violation
high severityHealth-basedArchivedCombined Radium (-226 and -228) MCL violation (Archived).
EPA SDWIS · MCL · Began Oct 1, 2022 · 3 years ago · Source ↗
Public Notice — Other violation
medium severityUnaddressedPublic Notice Other violation (Unaddressed).
EPA SDWIS · Other · Began May 10, 2010 · 16 years ago · Source ↗
Gross Alpha, Excl. Radon and U — MCL violation
high severityHealth-basedResolvedGross Alpha, Excl. Radon and U MCL violation (Resolved).
EPA SDWIS · MCL · Began Jan 1, 2010 · 16 years ago · Source ↗
Violation — Violation violation
medium severityContaminant Violation violation.
EPA SDWIS · Violation · Began — · Source ↗
Water-related lawsuits
No lawsuits on record.
In the news & sources
No coverage linked yet.