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Counties → Wisconsin

St. Croix County, Wisconsin

SDWIS compliance plate

Sheet WI109 · St. Croix County 164 sys · 3,287 viol · #893/3254

VIOL-SEVERE · HEALTH-MID · RANK-UPPER · PHOTO-FINISH · PFAS-HIGH · SRC-GW · SYS-LARGE · BOOK-FULL

  • VIOL-SEVERE 67.7% flagged
  • HEALTH-MID 26.3% health
  • RANK-UPPER #893/3254
  • PHOTO-FINISH ±0.4 pp
  • PFAS-HIGH 66.7% detect
  • SRC-GW GW lead 100%
  • SYS-LARGE 164 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Lincoln County (+ 0.4 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, St. Croix County ranks #893 of 3,254 counties by people served, and #24 of 71 counties in Wisconsin. See methodology · corpus placement.

St. Croix County standing, lower-flagged corpus third

Flagged-system rate 67.7% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 26.3% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 66.7% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #893 of 3,254 · #24 of 71 in Wisconsin.

Flagged-rate neighbourhood around St. Croix County

Lowest/highest poles plus in-state counties nearest St. Croix County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.

0% 20% 40% 60% 80% 100% Bayfield · lowest St. Croix · this county Sawyer · near Milwaukee · highest 52.1% 67.1% 67.7% 68% 68.2% 68.6% 95.3%

Source: EPA SDWIS (county aggregates) As of 2026-05-15

Water Systems

System Name Population Violations PFAS
Hudson Waterworks 17,635 16 Detected
New Richmond Waterworks 10,824 52 Detected
Baldwin Waterworks 4,440 19 Clean
Somerset Waterworks 2,854 44 -
Hammond Waterworks 1,884 33 -
Roberts Waterworks 1,872 8 -
Woodville Waterworks 1,386 28 -
Glenwood City Waterworks 1,102 25 -
Cedar Lake Speedway-West Well 919 7 -
Cedar Lake Speedway-East Well 919 18 -
WI DNR Willow River Cmpgd - 300 800 0 -
Star Prairie Waterworks 553 61 -
St Croix Natl Golf Course 520 0 -
YMCA Camp St Croix - Dining Hall 400 0 -
WI DNR Willow River Srvc Bldg 350 33 -
WI DNR Willow River Pic 300 4 -
Eau Galle Recreation Area 250 0 -
Nor Lake 250 11 -
Houlton Elementary School 250 14 -
Rivers Edge Cmpgd 210 10 -
Wall Street Village 191 14 -
Houlton MHP LLC 170 158 -
Wilson Waterworks 170 44 -
Country Cove Court LLC 150 37 -
St Croix Co Glen Hills Pk Group Area 150 26 -
St Croix Co Glen Hills Pk Picnic Area 150 19 -
New Richmond Golf Club 150 5 -
Peace Lutheran Church 150 14 -
St Croix Co Glen Hills Pk Cmpgd 150 20 -
Kingdom Hall Jehovahs Witnesses 145 0 -
Baldwin Christian School 137 75 -
Trinity Family Center 136 80 -
Hudson Town Hall 135 0 -
WI DNR Willow River Grp Cmpgd 130 10 -
Travel Centers of America 125 34 -
YMCA Camp St Croix - Bath House 125 0 -
Rivers Edge Restaurant 120 12 -
Bethel Highlands Lutheran Church 120 10 -
Abundant Life Church 110 177 -
Immanuel Evangelical Lutheran Church 100 5 -
Andersen Scout Camp Good Medicine 100 3 -
Andersen Scout Camp Shelter 2 100 2 -
Andersen Scout Camp Adirondack 123 100 7 -
Andersen Scout Camp Master Cabin 100 9 -
Andersen Scout Camp Peterson Cabins 100 4 -
Andersen Scout Camp House 100 8 -
Circle K #474 100 5 -
Badlands Recreation Inc 100 8 -
Rooster's Roadhouse 100 54 -
Big Guys BBQ Roadhouse 100 26 -

Compare beyond Wisconsin

Lower-flagged peers for St. Croix County

Cross-state counties nearest St. Croix County on flagged-system share (67.7%) and cumulative violation count (3,287). In-state neighbours stay on the compliance plate above.

Similar flagged-system rate

Nearest cross-state counties by % of SDWIS systems with at least one violation on record.

4 peers

Similar violation load

Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).

4 peers

Read our methodology · Check your water system - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.