Revised Total Coliform Rule (RTCR) violations in Wisconsin
888 active public water systems in Wisconsin had a Revised Total Coliform Rule (RTCR) violation in the past three years, 97 of them in the latest quarter of EPA's data. What Revised Total Coliform Rule (RTCR) is and why it matters.
Systems with a Revised Total Coliform Rule (RTCR) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Delavan Waterworks Delavan · Walworth County |
9,028 | 1 | 0 | |
|
Rice Lake Waterworks Rice Lake · Barron County |
9,012 | 1 | 0 | |
|
Black River Falls Waterworks Black River Falls · Jackson County |
3,608 | 3 | 1 | |
|
Stanley Waterworks Stanley · Chippewa County |
3,500 | 2 | 0 | |
|
Barron Light & Water Dept Barron · Barron County |
3,423 | 1 | 0 | |
|
Peshtigo Waterworks Peshtigo · Marinette County |
3,420 | 3 | 0 | |
|
Johnson Creek Waterworks Johnson Creek · Jefferson County |
3,318 | 4 | 1 | |
|
Hortonville Water Utility Hortonville · Outagamie County |
3,028 | 3 | 0 | |
|
Denmark Waterworks Denmark · Brown County |
2,684 | 3 | 1 | |
|
Spooner Waterworks Spooner · Washburn County |
2,653 | 1 | 0 | |
|
Loves Travel Stop Sheboygan Sheboygan · Sheboygan County |
2,070 | 4 | 1 | |
|
WI Dot Rest Area 13 Aztalan Lake Mills · Jefferson County |
1,904 | 1 | 0 | |
|
WI Dot Rest Area 14 Aztalan Milford · Jefferson County |
1,904 | 1 | 0 | |
|
Sevenwinds Casino County |
1,900 | 2 | 0 | |
|
Cambridge Water & Sewer Utility Cambridge · Dane County |
1,638 | 3 | 1 | |
|
Sharon Waterworks Sharon · Walworth County |
1,549 | 4 | 3 | |
|
Eagle River Waterworks Eagle River · Vilas County |
1,530 | 3 | 1 | |
|
Woodville Waterworks Woodville · St. Croix County |
1,386 | 1 | 0 | |
|
Manawa Waterworks Manawa · Waupaca County |
1,300 | 3 | 1 | |
|
WI Dnr Devils Lake North Shore Baraboo · Sauk County |
1,115 | 1 | 0 | |
|
Crivitz Waterworks Crivitz · Marinette County |
1,026 | 3 | 1 | |
|
Athens Waterworks Athens · Marathon County |
1,025 | 3 | 1 | |
|
Blue Mounds Waterworks Blue Mounds · Dane County |
950 | 2 | 0 | |
|
Southern Wisconsin Center Union Grove · Racine County |
950 | 4 | 0 | |
|
Arlington Waterworks Arlington · Columbia County |
946 | 3 | 1 | |
|
Rib Lake Waterworks Rib Lake · Taylor County |
945 | 2 | 0 | |
|
Necedah Waterworks Necedah · Juneau County |
844 | 3 | 1 | |
|
Birnamwood Waterworks Birnamwood · Shawano County |
832 | 1 | 0 | |
|
Pepin Waterworks Pepin · Pepin County |
816 | 5 | 2 | |
|
Melrose Mindoro United Campus Melrose · Jackson County |
800 | 2 | 1 | |
|
Wyocena Waterworks Wyocena · Columbia County |
768 | 1 | 0 | |
|
Glidden Sanitary District Glidden · Ashland County |
750 | 2 | 0 | |
|
Ridgeway Waterworks Ridgeway · Iowa County |
690 | 3 | 0 | |
|
Viola Waterworks Viola · Vernon County |
667 | 2 | 0 | |
|
WI Dnr Lake Wissota Shop Chippewa Falls · Chippewa County |
665 | 1 | 0 | |
|
Madison Country Day School Waunakee · Dane County |
660 | 2 | 0 | |
|
Prentice Waterworks Prentice · Price County |
660 | 3 | 1 | |
|
Rose Glen Elementary Waukesha · Waukesha County |
652 | 2 | 1 | |
|
Rockland Waterworks Rockland · La Crosse County |
642 | 3 | 1 | |
|
Kinney Lake Cmpgd Site 701 Marion · Waupaca County |
615 | 2 | 1 | |
|
Wicked Events and Rodeo Arena Medford · Taylor County |
603 | 4 | 1 | |
|
Elmbrook Lake Country Hartland · Waukesha County |
600 | 4 | 1 | |
|
Iron River Sanitary District Iron River · Bayfield County |
600 | 5 | 1 | |
|
Soldiers Grove Waterworks Soldiers Grove · Crawford County |
592 | 2 | 0 | |
|
Yorkville School Union Grove · Racine County |
561 | 2 | 1 | |
|
Ontario Waterworks Ontario · Vernon County |
554 | 4 | 1 | |
|
Alpine Valley Resort Elkhorn · Walworth County |
550 | 4 | 1 | |
|
New Auburn Waterworks New Auburn · Chippewa County |
549 | 1 | 0 | |
|
Boyd Waterworks Boyd · Chippewa County |
540 | 1 | 0 | |
|
Farm & Fleet of Dodgeville Dodgeville · Iowa County |
540 | 2 | 1 |
About this data
A system is counted once if any of its violations in the past three years involved Revised Total Coliform Rule (RTCR), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Revised Total Coliform Rule (RTCR) alone.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Wisconsin records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.