States › Wisconsin › St. Croix County

St. Croix County, WI Water Quality

Water quality data for 15 public water systems serving St. Croix County, Wisconsin — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 15 water systems · 26 cities
✅
Excellent — All Systems Performing Well

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

A

St. Croix County Earns a A

St. Croix County: 26 communities across 15 water systems. 100.0% have no open violations.

  • Median lead where detected: 1.50 ppb
  • 20 communities with a lead detection, 6 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 2 with significant inspection deficiencies
  • 100.0% of communities have no open violations
1.5 ppb
Median Lead Level
County-wide, 90th percentile
15
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
  • Hammond
    1.00 ppb
    No federal limits exceeded on record
    A
  • Glenwood
    Not detected
    No federal limits exceeded on record
    B
  • Baldwin
    0.65 ppb
    No federal limits exceeded on record
    B
  • New Richmond
    1.50 ppb
    No federal limits exceeded on record
    A
  • Baldwin
    1.00 ppb
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • St. Joseph
    Not detected
    2 significant inspection deficiencies
    B
  • Hudson
    6.10 ppb
    2 health-based violations since 2015
    B
  • North Hudson
    6.10 ppb
    2 health-based violations since 2015
    B
  • Hudson
    6.10 ppb
    2 health-based violations since 2015
    B
  • Cady
    Not detected
    1 significant inspection deficiency
    B
County Lead Level — Median 1.5 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 1.5 ppb — 10% of the federal action level
Systems by Lead Level
Under 5 ppb
16
5 – 10 ppb
3
10 – 15 ppb
1
No Data
6

All Cities in St. Croix County

Hudson 6.10 ppb B
New Richmond 1.50 ppb A
Baldwin 1.00 ppb A
North Hudson 6.10 ppb B
Somerset 1.80 ppb B
Roberts 1.00 ppb B
Hammond Not detected B
Hudson 6.10 ppb B
Woodville 0.65 ppb B
Glenwood City Not detected B
Star Prairie 0.39 ppb B
Somerset 11.48 ppb B
St. Joseph Not detected B
Richmond 1.50 ppb A
Troy Not detected B
Wilson 3.50 ppb B
Star Prairie 1.80 ppb B
Stanton 1.50 ppb A
Eau Galle 0.65 ppb B
Kinnickinnic 0.88 ppb A
Warren 1.00 ppb B
Baldwin 0.65 ppb B
Glenwood Not detected B
Cady Not detected B
Springfield 3.50 ppb B
Hammond 1.00 ppb A
Showing 26 cities
No active violations Active violations

About St. Croix County Drinking Water

St. Croix County is served by 15 water systems covering 26 communities. No community here has an open violation on record.

Of the communities reporting lead results, 20 recorded a detection, with a median of 1.50 ppb — 10% of the federal action level. 6 reported none detected, which means below the laboratory limit rather than an absence of lead.

No community here has PFAS above the federal limit on record. State inspectors recorded significant deficiencies at 2 of them.

Frequently Asked Questions

Is St. Croix County tap water safe to drink?▼
No community in St. Croix County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in St. Croix County?▼
Among communities with a detection the median is 1.50 ppb, 10% of the 15 ppb action level. 6 reported none detected and 0 reported no result.
How many water systems serve St. Croix County?▼
15 community water systems serve 26 communities here.
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