Tapcensus

Wisconsin

Jefferson County drinking water quality

194 active public water systems serve 88,318 people in Jefferson County. 166 are compliant, 28 had at least one EPA violation in the past three years, 0 are designated serious violators, and 0 carry a health flag.

Active systems 194 27 community systems
People served 88K by public water systems
Systems with violations 28 14% of active systems, past 3 years
Serious violators 0 0 systems carry a health flag

Community water systems

27 systems, largest first
SystemServesStatusRules violated, 3 yrUnresolved
Watertown Waterworks
Watertown 		23,945 1 0
Fort Atkinson Waterworks
Fort Atkinson 		12,390 0 0
Jefferson Waterworks
Jefferson 		7,926 3 1
Lake Mills Waterworks
Lake Mills 		6,211 2 2
Waterloo Waterworks
Waterloo 		3,520 2 1
Johnson Creek Waterworks
Johnson Creek 		3,318 4 1
Palmyra Waterworks
Palmyra 		1,756 0 0
Autumn Ridge Water System LLC
Ixonia 		575 2 1
Spacious Acres Mobile Home Community
Sullivan 		525 0 0
Tremain Mobile Home Park
Dousman 		475 4 1
Lakewood Village
Lake Mills 		160 1 0
Oak Ridge Mobile Com 1 & 2
Fort Atkinson 		133 0 0
Breezy Knoll Community
Cambridge 		116 0 0
Stanton Place I
Ixonia 		66 0 0
Oak Ridge Mobile Com 4
Fort Atkinson 		60 1 0
Oak Ridge Mobile Com 3
Fort Atkinson 		58 0 0
River Valley Apts North
Ixonia 		48 1 0
River Valley Apts South
Ixonia 		48 1 0
Parkview Apartments
Ixonia 		45 2 0
Wolfs Mobile Homes
Whitewater 		40 3 1
Ripview Court 1
Cambridge 		35 0 0
Ripview Court 4
Cambridge 		35 0 0
Stanton Place II
Ixonia 		32 0 0
Hickory Hill Park LLC
Watertown 		31 0 0
Ripview Court 2
Cambridge 		31 0 0
Ripview Court 3
Cambridge 		31 0 0
Rock River Mobile Home Park
Johnson Creek 		30 4 1
Non-community systems (167: schools, campgrounds, workplaces, restaurants)

These systems serve places people visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
WI Dot Rest Area 13 Aztalan
Lake Mills 		1,904 1 0
WI Dot Rest Area 14 Aztalan
Milford 		1,904 1 0
River Bend Resort
Watertown 		1,520 0 0
T&s Buss INC
Sullivan 		864 0 0
Concord General Store
Oconomowoc 		807 0 0
Olin-Sang-Ruby Union Institute Main System
Oconomowoc 		704 0 0
Olin-Sang-Ruby Union Institute Bath House
Oconomowoc 		700 0 0
Olin-Sang-Ruby Union Institute Dining Hall
Oconomowoc 		700 1 1
Lake Mills Travel Plaza
Lake Mills 		662 0 0
Hubbleton Brewing Taproom & Grill
Watertown 		610 0 0
Faith Community Church/school
Fort Atkinson 		550 0 0
Crawfish Junction
Johnson Creek 		412 0 0
ST Pauls EV Lutheran Church
Ixonia 		406 0 0
Station Ixonia
Ixonia 		360 0 0
Silo Ridge Clubhouse
Fort Atkinson 		322 0 0
Ixonia Elementary School
Ixonia 		310 1 0
Rons Market
Helenville 		308 0 0
Wishing Well RV Resort Lodge Well System
Fort Atkinson 		303 0 0
Grace Lutheran Church
Cambridge 		302 0 0
First Congreg United CH of Christ/gingerbread Preschool
Watertown 		280 0 0
North Shore Chophouse
Fort Atkinson 		257 0 0
Wayside Tavern
Jefferson 		251 0 0
Bark River Campground Main Building System
Jefferson 		250 0 0
WI Dnr Glacial Drumlin Trail Sullivan Rst AR
Delafield 		250 2 1
Sullivan Elementary School
Sullivan 		233 0 0
Immanuel Lutheran Church
Johnson Creek 		231 0 0
Pernats of Ixonia
Ixonia 		227 0 0
Rosy Lane Holsteins Farm Office
Watertown 		221 0 0
Lake Ripley Country Club Clubhouse
Cambridge 		208 0 0
Edge of Town Cafe
Palmyra 		206 0 0
Lake Ripley Family Restaurant
Cambridge 		206 0 0
Real Maccoy the
Whitewater 		205 0 0
Sullivan Saloon
Sullivan 		205 0 0
Koshkonong Mounds Country Club
Fort Atkinson 		204 0 0
Rome Riverside Campground
Sullivan 		202 2 0
Bark River Lanes
Sullivan 		201 0 0
Aztalan Inn
Lake Mills 		200 0 0
Wishing Well RV Resort Deep Well Syst
Fort Atkinson 		200 0 0
Von Loppys
Ixonia 		177 0 0
ST Johns EV Luth Church
Sullivan 		154 0 0
Donnys
Watertown 		152 0 0
Lous Riverview
Jefferson 		152 0 0
Skate Express
Watertown 		151 0 0
Hebron Community & Head Start Building
Hebron 		143 0 0
VFW Post 3709 -Beaudoin-Koehler-Draeger
Watertown 		130 0 0
Lake Ripley Lanes
Cambridge 		129 0 0
Wingin IT
Helenville 		128 0 0
G & V Machine CO INC
Ixonia 		127 0 0
ST Lukes Lutheran Church
Sullivan 		126 0 0
Black Frog Grill LLC
Sullivan 		125 1 0
Natures Villa
Helenville 		125 0 0
ST Lawrence Cath Parish Center
Jefferson 		125 0 0
Eberts Greenhouse Village Retail Store
Ixonia 		124 0 0
Bark River Campground East Area
Jefferson 		122 0 0
Binggs
Whitewater 		122 0 0
Create-A-Pack Foods
Ixonia 		120 0 0
ST Pauls Lutheran School
Ixonia 		117 0 0
Ixonia Bank
Ixonia 		114 0 0
Spring Creek Golf Center
Whitewater 		110 0 0
Island Bar & Grille
Fort Atkinson 		108 0 0
Days Inn
Johnson Creek 		105 0 0
Hwy 18 Outdoor Theatre
Jefferson 		105 0 0
Jellis Market
Helenville 		105 0 0
Topcon Positioning Systems
Fort Atkinson 		105 1 0
Cash & Olives Pub
Cambridge 		104 0 0
Kingdom Hall of Jehovahs Witnesses
Fort Atkinson 		103 0 0
Whats the Point
Fort Atkinson 		103 0 0
Creekwood Cage Free
Lake Mills 		102 0 0
Ixonia Pub
Ixonia 		102 0 0
Kroghville Oasis
Waterloo 		102 0 0
Lake Ripley Country Club Course System
Cambridge 		102 0 0
Bitzs Outer Limits
Fort Atkinson 		101 0 0
Pilgrims Campground
Fort Atkinson 		100 0 0
Ripley Park Bath House
Cambridge 		100 0 0
Western Waukesha County Dog Training Club
Oconomowoc 		100 0 0
Aztalan Bio
Johnson Creek 		99 3 1
Edgewater Supper Club
Jefferson 		96 0 0
Busseyville Park
Fort Atkinson 		95 0 0
Ebenezer Moravian Church
Watertown 		89 0 0
Econo Lodge
Lake Mills 		88 0 0
Koshkonong Mounds Country Club Bear Trap
Fort Atkinson 		88 0 0
ST Peters Lutheran School
Helenville 		87 0 0
Pour Mans Pub & Grill
Sullivan 		80 0 0
IN Good Spirits
Sullivan 		79 0 0
Lilypad the
Fort Atkinson 		78 0 0
Dig-N-Kats
Sullivan 		77 0 0
ST Johns Lutheran Church
Waterloo 		77 0 0
Sunset Bar & Grill
Fort Atkinson 		77 0 0
K & S Manufacturing Bldg 1
Ixonia 		76 1 1
Firemens Park
Sullivan 		75 0 0
ST Mary Help of Christians
Sullivan 		75 0 0
WI Dnr Sandhill Station Cmpgrd New
Lake Mills 		75 0 0
ST Johns Lutheran Church
Ixonia 		74 0 0
Casserly Properties
Ixonia 		73 0 0
Cross Lutheran Church
Ixonia 		66 0 0
Petes Bar
Fort Atkinson 		63 0 0
Edwin Frohmader VFW Post 1879
Fort Atkinson 		60 0 0
Milford Hills Hunt Club
Johnson Creek 		60 0 0
Rock River CO Park
Johnson Creek 		60 0 0
SP Park at Palmyra Eagle HS
Palmyra 		60 0 0
All 167 in the systems table
Inactive systems (181, no longer operating or reporting)

Kept for the record and excluded from the county totals above. Browse inactive systems.

About this data

Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.

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. Retrieved from ECHO on Oct 11, 2026.