All water systems in Wisconsin
11,026 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Old Crow Bar & Grill Little Suamico Tn · Oconto County |
25 | 0 | 0 | |
|
Old Finley Tavern Necedah · Juneau County |
25 | 0 | 0 | |
|
Old Still Saloon Gillett Tn · Oconto County |
25 | 2 | 0 | |
|
Old Town Hall the Townsend Tn · Oconto County |
25 | 3 | 1 | |
|
Olde World Pastries Plus Green Bay · Brown County |
25 | 0 | 0 | |
|
Olin-Sang-Ruby Union Institute Pool Well Oconomowoc · Jefferson County |
25 | 0 | 0 | |
|
Olive Pit the Townsend Tn · Oconto County |
25 | 1 | 0 | |
|
Oliver Tavern Oliver · Douglas County |
25 | 0 | 0 | |
|
Oliver Village Hall Oliver · Douglas County |
25 | 0 | 0 | |
|
Olivet Lutheran Church and Addition La Crosse · La Crosse County |
25 | 0 | 0 | |
|
Oma Town Supplemental Well Hurley · Iron County |
25 | 0 | 0 | |
|
Omaha Trail Wayside Mauston · Juneau County |
25 | 0 | 0 | |
|
ON a Whim Sweet Treats Manitowoc · Manitowoc County |
25 | 0 | 0 | |
|
ON the Rocks Kampground Gresham · Shawano County |
25 | 1 | 0 | |
|
ON the Rocks Kampground 300s North Gresham · Shawano County |
25 | 0 | 0 | |
|
ON the Rocks Kampground 300s South Gresham · Shawano County |
25 | 0 | 0 | |
|
ON the Rocks Kampground House Well Gresham · Shawano County |
25 | 0 | 0 | |
|
ON the Rocks Kampground Pavilion Gresham · Shawano County |
25 | 0 | 0 | |
|
One Barrel Brewing Egg Harbor St · Door County |
25 | 2 | 0 | |
|
One O One Florence · Florence County |
25 | 0 | 0 | |
|
Oneida Golf Snack Shack Green Bay · Brown County |
25 | 0 | 0 | |
|
Oneil Creek Cmpgd Store Chippewa Falls · Chippewa County |
25 | 0 | 0 | |
|
Ono United Methodist Church Maiden Rock · Pierce County |
25 | 0 | 0 | |
|
Open Door Bible Church Port Washington · Ozaukee County |
25 | 0 | 0 | |
|
Operating Engineers Maint Bldg Coloma · Waushara County |
25 | 0 | 0 | |
|
Orchard Hill Assembly of God Mukwonago · Walworth County |
25 | 0 | 0 | |
|
Organique Clinic Spa Cafe Tomahawk · Lincoln County |
25 | 0 | 0 | |
|
Organized Chaos Shell Lake · Washburn County |
25 | 0 | 0 | |
|
Osborn Town Hall Seymour · Outagamie County |
25 | 0 | 0 | |
|
Osceola Community Church Osceola · Polk County |
25 | 0 | 0 | |
|
Osceola Rod & Gun Club Osceola · Polk County |
25 | 0 | 0 | |
|
Oshkosh Country Club Pool Area Oshkosh · Winnebago County |
25 | 0 | 0 | |
|
Oshvegas Palms Resort Oshkosh · Winnebago County |
25 | 0 | 0 | |
|
Osseo Cenex Osseo · Eau Claire County |
25 | 0 | 0 | |
|
Osseo Community Church Osseo · Trempealeau County |
25 | 1 | 1 | |
|
Osseo Junior Baseball & Softball Park Osseo · Trempealeau County |
25 | 0 | 0 | |
|
Osseo Merchants Baseball Park Osseo · Trempealeau County |
25 | 0 | 0 | |
|
Otter Bay Cable · Bayfield County |
25 | 0 | 0 | |
|
Otter Creek Christian Fellowship Wheeler · Dunn County |
25 | 0 | 0 | |
|
Otter Lake Bait Shop and Camp Store Stanley · Chippewa County |
25 | 0 | 0 | |
|
Otter Springs Bar Bowler · Shawano County |
25 | 0 | 0 | |
|
Otter Springs Cmpgd Bowler · Shawano County |
25 | 0 | 0 | |
|
Otter Springs Mobile Homes Bowler · Shawano County |
25 | 0 | 0 | |
|
Ottery Transportation Campbellsport · Fond du Lac County |
25 | 0 | 0 | |
|
Otto Finell Memorial Park Lake Nebagamon · Douglas County |
25 | 0 | 0 | |
|
Oulu Pioneer Memorial Park Iron River · Bayfield County |
25 | 0 | 0 | |
|
Our Lady of Lourdes Church and Office Rice Lake · Barron County |
25 | 0 | 0 | |
|
Our Lady of the Lake Cath CH Mauston · Juneau County |
25 | 0 | 0 | |
|
Our Redeemer Lutheran CH Maple Valley Tn · Oconto County |
25 | 0 | 0 | |
|
Our Savior Free Lutheran Church Mason · Bayfield County |
25 | 1 | 1 |
About this data
Rules violated counts the rules a system was in violation of in the past three years, including monitoring and reporting lapses; one rule can carry several violations. Unresolved is the number of those rules currently in violation at EPA's latest data refresh.
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.