Nitrate violations in Wisconsin
226 active public water systems in Wisconsin had a Nitrate violation in the past three years, 9 of them in the latest quarter of EPA's data. What Nitrate is and why it matters.
Health effects: Methemoglobinemia in infants under 6 months: gut bacteria convert nitrate to nitrite, which blocks oxygen transport in blood. Pregnant women should also take precautions. Chronic adult exposure at elevated levels may increase cancer risk.
Systems with a Nitrate violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Moxies Supper Club Casco · Kewaunee County |
110 | 3 | 0 | |
|
Northern D Lites Drive Inn Lakewood · Oconto County |
110 | 3 | 2 | |
|
Terrys Hitching Post Manchester · Green Lake County |
105 | 3 | 1 | |
|
Whiskey Dix Malone · Fond du Lac County |
104 | 3 | 1 | |
|
Zion EV Lutheran CH Egg Harbor · Door County |
104 | 2 | 0 | |
|
7-Eleven 35845 Oconomowoc · Waukesha County |
103 | 2 | 0 | |
|
New Vision Bretheren in Christ Church Pewaukee · Waukesha County |
102 | 2 | 0 | |
|
Kingdom Hall of Jev Witness Green Lake · Green Lake County |
100 | 1 | 0 | |
|
Lynn Dairy INC Granton · Clark County |
100 | 1 | 0 | |
|
View the Chippewa Falls · Chippewa County |
100 | 2 | 0 | |
|
Aztalan Bio Johnson Creek · Jefferson County |
99 | 3 | 1 | |
|
Lac DU Flambeau Tribal Campgrd County |
99 | 2 | 0 | |
|
Andersons Trailer Court Rice Lake · Barron County |
95 | 7 | 4 | |
|
Manitou Falls Sanitary District NO 1 Superior · Douglas County |
95 | 10 | 5 | |
|
S and J Wild River MHP Hayward · Sawyer County |
90 | 4 | 1 | |
|
Baileys Harbor Yacht Club Resort Baileys Harbor · Door County |
82 | 3 | 1 | |
|
Party Palace Fond Du Lac · Fond du Lac County |
82 | 2 | 0 | |
|
School House Tavern Westfield · Marquette County |
81 | 1 | 0 | |
|
Five Star Building F Window Coating Randall · Kenosha County |
80 | 4 | 1 | |
|
Rivers Bend Cmpgd Montello · Marquette County |
80 | 2 | 0 | |
|
Provision Partners Auburndale Auburndale · Wood County |
80 | 3 | 2 | |
|
Mels Micro Brewery Richland Center · Richland County |
77 | 2 | 0 | |
|
Bedrock Church Rio · Columbia County |
76 | 2 | 0 | |
|
Indian Shores Camp Strongheart Woodruff · Oneida County |
75 | 2 | 0 | |
|
Northland Mission Dunbar · Marinette County |
75 | 7 | 0 | |
|
WI Dnr Harrington Beach Quarry Lake Belgium · Ozaukee County |
75 | 2 | 1 | |
|
WI Dnr Harrington Beach Welcome Center & North Picnic Belgium · Ozaukee County |
75 | 2 | 1 | |
|
Holy Rosary School Durand · Pepin County |
70 | 2 | 0 | |
|
ST Johns EV Lutheran CH Kingston · Green Lake County |
70 | 2 | 0 | |
|
West Riverside Energy Center Beloit · Rock County |
67 | 1 | 0 | |
|
Center House Ripon · Green Lake County |
65 | 3 | 0 | |
|
Ritchie Implement Lancaster · Grant County |
65 | 3 | 1 | |
|
Advanced Disposal Beloit Beloit · Rock County |
60 | 1 | 0 | |
|
Baer Manufacturing Hudson · St. Croix County |
60 | 2 | 0 | |
|
Sevenwinds RV Park County |
60 | 2 | 0 | |
|
Washington Island Recreation Ctr Washington Island · Door County |
58 | 3 | 1 | |
|
Honkers Muscoda · Richland County |
56 | 3 | 1 | |
|
UP the Street Glen Haven · Grant County |
56 | 3 | 1 | |
|
Parkside Inn Ellison Bay · Door County |
54 | 3 | 1 | |
|
Menominee Cultural Museum County |
53 | 3 | 1 | |
|
Yoders Rockville Bar Potosi · Grant County |
53 | 3 | 1 | |
|
Browns Lake Condos Well 1 by Pool Burlington · Racine County |
52 | 3 | 1 | |
|
Silica Pub Malone · Fond du Lac County |
52 | 2 | 0 | |
|
Murfs Neshkoro · Marquette County |
51 | 4 | 0 | |
|
Caseys 4 Corners Chippewa Falls · Chippewa County |
50 | 1 | 0 | |
|
Crossroads Cafe Saxeville · Waushara County |
50 | 3 | 1 | |
|
Eau Galle Cheese Factory LLC Durand · Pepin County |
50 | 1 | 0 | |
|
Jts on 96 Bar and Grill Medina · Outagamie County |
50 | 1 | 0 | |
|
True Harvest Bourbon CO Wild Rose · Waushara County |
50 | 3 | 1 | |
|
LK Helen Bible CP Dining Wausaukee · Marinette County |
50 | 2 | 1 |
About this data
A system is counted once if any of its violations in the past three years involved Nitrate, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Nitrate 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.