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Washington County, WI Water Quality

Water quality data for 9 public water systems serving Washington 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 · 15 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

Washington County Earns a B

Washington County: 15 communities across 9 water systems. 100.0% have no open violations.

  • Median lead where detected: 2.40 ppb
  • 13 communities with a lead detection, 2 reporting none detected
  • 4 communities with PFAS above the federal limit
  • 0 with significant inspection deficiencies
  • 100.0% of communities have no open violations
2.4 ppb
Median Lead Level
County-wide, 90th percentile
9
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
  • Addison
    1.00 ppb
    No federal limits exceeded on record
    B
  • Richfield
    1.95 ppb
    No federal limits exceeded on record
    B
  • Germantown
    1.70 ppb
    1 health-based violation since 2015
    A
  • Jackson
    2.40 ppb
    1 health-based violation since 2015
    A
  • Jackson
    2.40 ppb
    1 health-based violation since 2015
    A
⚠ Needs Attention
  • Kewaskum
    Not detected
    PFAS above the limit at 2 of 4 sampling points
    C
  • Kewaskum
    Not detected
    PFAS above the limit at 2 of 4 sampling points
    C
  • Hartford
    0.86 ppb
    PFAS above the limit at 2 of 5 sampling points
    B
  • Hartford
    0.86 ppb
    PFAS above the limit at 2 of 5 sampling points
    B
  • West Bend
    7.20 ppb
    Copper above the 1,300 ppb action level
    B
County Lead Level — Median 2.4 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2.4 ppb — 16% of the federal action level
Systems by Lead Level
Under 5 ppb
9
5 – 10 ppb
3
10 – 15 ppb
1
No Data
2

All Cities in Washington County

West Bend 7.20 ppb B
Germantown 1.70 ppb A
Hartford 0.86 ppb B
Jackson 2.40 ppb A
Kewaskum Not detected C
Slinger 3.10 ppb B
Trenton 7.20 ppb B
Jackson 2.40 ppb A
Addison 1.00 ppb B
Barton 7.20 ppb B
Hartford 0.86 ppb B
West Bend 11.85 ppb B
Richfield 1.95 ppb B
Polk 3.10 ppb B
Kewaskum Not detected C
Showing 15 cities
No active violations Active violations

About Washington County Drinking Water

Washington County is served by 9 water systems covering 15 communities. No community here has an open violation on record.

Of the communities reporting lead results, 13 recorded a detection, with a median of 2.40 ppb — 16% of the federal action level. 2 reported none detected, which means below the laboratory limit rather than an absence of lead.

4 of 15 communities have PFAS above the limits EPA set in 2024, measured as a running annual average at each sampling point. State inspectors recorded no significant deficiencies.

Frequently Asked Questions

Is Washington County tap water safe to drink?▼
No community in Washington County has an open violation on record. 4 of 15 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Washington County?▼
Among communities with a detection the median is 2.40 ppb, 16% of the 15 ppb action level. 2 reported none detected and 0 reported no result.
How many water systems serve Washington County?▼
9 community water systems serve 15 communities here.
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