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County drinking water records

Waukesha County, WI drinking water systems

49 community water systems serve Waukesha County, WI, reporting 246,162 people served in all. A system that also serves other counties counts all of its customers here.

18 of them (37%) had at least one health-based violation in the last 10 years. 16 systems still have one unresolved.

45 rely mainly on groundwater and 4 on surface water, counting water bought from other systems.

Their lead service line inventories list 795 lead lines, 36 galvanized lines that must be replaced and 3,860 lines of unknown material.

24 more systems are placed in Waukesha County, WI by the county their records name because they have no service area map that lines up with their own records, so they are listed apart and not counted here.

Community water systems
49
People served, sum of each system's own figure
246,162
Systems with a health-based violation, last 10 years
18
Systems with one unresolved
16
Lead service lines in inventories
795

Water systems serving Waukesha County

49 systems

People served is each system's own figure for its whole service area. Violation counts cover the last 10 years of EPA records.

System Serves People served Main source Health-based violations, 10 years Unresolved Lead lines
Waukesha Water Utility Waukesha 70,718 Purchased surface water 149 2 0
Brookfield Water Utility Brookfield 29,070 Groundwater 7 0 0
New Berlin Water Utility New Berlin 27,899 Purchased surface water 0 0 0
Menomonee Falls WW - Surface Water Menomonee Falls 23,867 Purchased surface water 1 0 4
Oconomowoc Waterworks Oconomowoc and Okauchee Lake 15,805 Groundwater 0 0 780
Sussex Village Hall & Water Utility Sussex and Lisbon 11,750 Groundwater 42 3 0
Hartland Waterworks Hartland 9,212 Groundwater 0 0 10
Pewaukee City Water and Sewer Utility Pewaukee city and Pewaukee village 8,671 Groundwater 16 4 0
Mukwonago Waterworks Mukwonago 8,190 Groundwater 0 2 0
Pewaukee Village Waterworks Pewaukee village and Pewaukee city 8,166 Groundwater 22 11 0
Muskego Water Utility Muskego 8,150 Groundwater 1 2 0
Town of Brookfield San Dist 4 Brookfield and land outside it 6,419 Groundwater 0 0 0
Dousman Water Utility Dousman 2,350 Groundwater 1 1 1
Butler Waterworks Butler 2,181 Purchased surface water 0 0 0
Prairie Village Water Trust North Prairie 2,100 Groundwater 1 0 0
Eagle Waterworks Eagle 1,950 Groundwater 0 0 0
Menomonee Falls WW - Groundwater Menomonee Falls 1,796 Groundwater 0 0 0
Lake Meadows Water Trust Muskego 750 Groundwater 0 0 0
Hale Park Meadows Muskego 720 Groundwater 0 2 0
Durham Meadows Water Trust Muskego 700 Groundwater 0 0 0
Delafield Square Delafield 587 Groundwater 0 0 0
Lake Drive Water Trust Okauchee Lake and Oconomowoc 500 Groundwater 1 0 0
Brandybrook Subdivision Wales 474 Groundwater 1 1 0
Parquelynn Village Nashotah, Okauchee Lake and 1 more 450 Groundwater 0 0 0
Willow Springs MHP 2 & 3 Lisbon and Sussex 446 Groundwater 0 0 0
Nashotah House Nashotah, Summit and 1 more 350 Groundwater 0 0 0
St Johns Northwestern Academies Delafield 340 Groundwater 2 2 0
Sunnyfield Acres Oconomowoc and land outside it 300 Groundwater 0 0 0
Delafield Waterworks Delafield 300 Groundwater 0 0 0
Arbors Delafield 280 Groundwater 1 2 0
Genesee Lake School South Oconomowoc 230 Groundwater 0 1 0
Lad Lake Dousman 180 Groundwater 0 0 0
Lannon Water Utility Lannon 172 Groundwater 0 0 0
Genesee Lake School North Summit and Oconomowoc 110 Groundwater 0 0 0
Heaven City Mukwonago 106 Groundwater 0 0 0
Lincolnshire Place Wales 100 Groundwater 0 0 0
Stoney Creek Adult Community Muskego 95 Groundwater 0 0 0
Country Aire Apartments 2 Delafield, Summit and 1 more 90 Groundwater 0 0 0
Country Aire Apartments 3 Summit and Hartland 80 Groundwater 0 0 0
Apartments of Stoneridge Wales and Delafield 75 Groundwater 1 2 0
Mission Lakes II Okauchee Lake 68 Groundwater 0 0 0
Knollcrest Delafield 66 Groundwater 1 0 0
Douglas Plaza South Elm Grove and land outside it 62 Groundwater 0 2 0
Cambridge Place of Delafield Delafield 50 Groundwater 1 2 0
Country Court Subdivision Menomonee Falls and Pewaukee city and land outside them 45 Groundwater 0 0 0
Evergreens North Lake 40 Groundwater 1 2 0
Country Aire Condos 4835 Hartland 40 Groundwater 0 0 0
Muskego Lake Aire Apartments Okauchee Lake and Muskego 35 Groundwater 0 0 0
Sanctuary of Delafield Delafield 27 Groundwater 1 0 0

Systems placed by county record in Waukesha County

24 systems

EPA has no service area map for some of these systems, and the maps it has for the others do not line up with their own records. They are placed by the county their records name (the counties EPA lists them serving, or the county coded in their IDs where EPA lists none), and without a map they are not counted in the figures above.

System Serves People served Main source Health-based violations, 10 years Unresolved Lead lines
Squires Grove County on record 410 Groundwater 0 0 0
Marian Heights Subdivision County on record 400 Groundwater 0 0 0
Marlan Meadows Homeowners Assoc County on record 210 Groundwater 0 0 0
Emerald Woods Condos County on record 150 Groundwater 1 2 0
Oakton Beach County on record 144 Groundwater 0 0 0
Norris Inc County on record 141 Groundwater 2 4 0
Pioneer Centre County on record 140 Groundwater 0 0 0
Lake Country Apartments County on record 84 Groundwater 0 1 0
Schoenstatt Sisters of Mary County on record 80 Groundwater 0 0 0
Willow Glen Apartments County on record 80 Groundwater 2 2 0
Elm Grove Terrace County on record 75 Groundwater 0 0 0
Hills of Wales Apts County on record 50 Groundwater 1 2 0
Carriage Hills Condominiums County on record 50 Groundwater 2 4 0
Delafield Lakes 402 County on record 50 Groundwater 0 0 0
Country Aire Condos 4821 County on record 40 Groundwater 0 0 0
Country Aire Condos 4887 County on record 40 Groundwater 0 0 0
Country Aire Condos 4875 County on record 40 Groundwater 0 0 0
Douglas Plaza North County on record 30 Groundwater 0 2 0
Quail Hollow Condos County on record 30 Groundwater 0 0 0
Delafield Woods 411 County on record 28 Groundwater 0 0 0
Delafield Woods 828 County on record 26 Groundwater 0 0 0
Delafield Lakes 404 County on record 25 Groundwater 0 0 0
Wells St Station 425 West County on record 25 Groundwater 0 0 0
Wells St Station 435 East County on record 25 Purchased groundwater 0 0 0

Cities and towns in Waukesha County

24 places

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Counties come from the counties EPA lists each system serving, matched to 2024 Census counties; where EPA lists none, from the county coded in the system's ID, its service area map, or its mailing address. A county holding at least a fifth of a system's service area map is added when at least a fifth of that map lies in those counties. Towns are the ones EPA lists and the Census places such a map covers, always inside those counties. In New England, where EPA's town names a whole Town, it is not matched to the village of the same name. A system is not listed in a county holding less than a fifth of its map, or in a county or town its map reaches when the map lies mostly outside the counties EPA lists, so a page can leave out a system that serves part of the area. Methodology and limitations