States › Wisconsin › Door County

Door County, WI Water Quality

Water quality data for 8 public water systems serving Door County, Wisconsin — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 8 water systems · 12 cities
✅
Excellent — All Systems Performing Well

Water quality across the county is outstanding with minimal violations and very low lead levels.

A

Door County Earns a A

Door County: 12 communities across 8 water systems. 100.0% have no open violations.

  • Median lead where detected: 2.85 ppb
  • 11 communities with a lead detection, 1 reporting none detected
  • 3 communities with PFAS above the federal limit
  • 0 with significant inspection deficiencies
  • 100.0% of communities have no open violations
2.85 ppb
Median Lead Level
County-wide, 90th percentile
8
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
  • Forestville
    0.21 ppb
    No federal limits exceeded on record
    B
  • Egg Harbor
    0.17 ppb
    No federal limits exceeded on record
    B
  • Baileys Harbor
    0.14 ppb
    No federal limits exceeded on record
    B
  • Union
    Not detected
    No federal limits exceeded on record
    B
  • Gardner
    0.21 ppb
    No federal limits exceeded on record
    B
⚠ Needs Attention
  • Egg Harbor
    2.85 ppb
    Copper above the 1,300 ppb action level
    C
  • Sturgeon Bay
    3.60 ppb
    PFAS above the limit at 1 of 5 sampling points
    B
  • Sevastopol
    3.60 ppb
    PFAS above the limit at 1 of 5 sampling points
    B
  • Sturgeon Bay
    3.60 ppb
    PFAS above the limit at 1 of 5 sampling points
    B
  • Liberty Grove
    1.25 ppb
    Copper above the 1,300 ppb action level
    B
County Lead Level — Median 2.85 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2.85 ppb — 19% of the federal action level
Systems by Lead Level
Under 5 ppb
9
5 – 10 ppb
2
No Data
1

All Cities in Door County

Sturgeon Bay 3.60 ppb B
Sister Bay 6.10 ppb B
Egg Harbor 2.85 ppb C
Forestville 0.21 ppb B
Egg Harbor 0.17 ppb B
Baileys Harbor 0.14 ppb B
Liberty Grove 1.25 ppb B
Union Not detected B
Gardner 0.21 ppb B
Sevastopol 3.60 ppb B
Sturgeon Bay 3.60 ppb B
Ephraim 6.10 ppb B
Showing 12 cities
No active violations Active violations

About Door County Drinking Water

Door County is served by 8 water systems covering 12 communities. No community here has an open violation on record.

Of the communities reporting lead results, 11 recorded a detection, with a median of 2.85 ppb — 19% of the federal action level. 1 reported none detected, which means below the laboratory limit rather than an absence of lead.

3 of 12 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 Door County tap water safe to drink?▼
No community in Door County has an open violation on record. 3 of 12 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Door County?▼
Among communities with a detection the median is 2.85 ppb, 19% of the 15 ppb action level. 1 reported none detected and 0 reported no result.
How many water systems serve Door County?▼
8 community water systems serve 12 communities here.
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