County · Wisconsin
Waukesha County, Wisconsin: drinking water records
Explore EPA records for 73 community water systems across 26 ZIP codes in Waukesha County, then find water-testing resources and available recent monitoring-station readings.
Data as of EPA UCMR 5 final release, August 2026 (file dated Aug 28, 2026) · EPA SDWIS 2026Q2 (file dated Jul 9, 2026). How we build these pages
Drinking-water records
EPA survey and compliance records are historical reports. UCMR 5 results are available for 12 of the 73 listed systems in this snapshot. A system with no reported PFAS detection is not a test of every tap or every contaminant.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems in this county
All 73 active community systems in the available county records, sorted by record completeness. Scroll the table to explore more systems.
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Waukesha Water Utility WI2680238 | 70,718 | 420 | 0 | 143 | 0.6 ppbbelow the action level |
| Brookfield Water Utility WI2680253 | 29,070 | 1,020 | 4 | 8 | 1.5 ppbbelow the action level |
| Menomonee Falls Ww - Surface Water WI2680082 | 23,867 | 120 | 0 | 1 | 2.1 ppbbelow the action level |
| Sussex Village Hall & Water Utility WI2680233 | 11,750 | 240 | 0 | 40 | 2.8 ppbbelow the action level |
| Pewaukee City Water and Sewer Utility WI2680214 | 8,671 | 480 | 10 | 17 | 2.6 ppbbelow the action level |
| Pewaukee Village Waterworks WI2680229 | 8,166 | 300 | 2 | 23 | 0 ppbbelow the action level |
| Muskego Water Utility WI2681741 | 8,150 | 480 | 0 | 1 | 3.9 ppbbelow the action level |
| New Berlin Water Utility WI2680217 | 27,899 | 120 | 0 | 0 | 0.3 ppbbelow the action level |
| Oconomowoc Waterworks WI2680227 | 15,805 | 240 | 2 | 0 | 6.8 ppbbelow the action level |
| Hartland Waterworks WI2680205 | 9,212 | 300 | 7 | 0 | 4.2 ppbbelow the action level |
| Mukwonago Waterworks WI2680209 | 8,190 | 120 | 0 | 0 | 3.2 ppbbelow the action level |
| Town of Brookfield San Dist 4 WI2680239 | 6,419 | 180 | 2 | 0 | 3.4 ppbbelow the action level |
| Dousman Water Utility WI2680197 | 2,350 | 0 | 0 | 1 | 2.3 ppbbelow the action level |
| Prairie Village Water Trust WI2680277 | 2,100 | 0 | 0 | 1 | 2.6 ppbbelow the action level |
| Lake Drive Water Trust WI2683440 | 500 | 0 | 0 | 1 | 0.5 ppbbelow the action level |
| Brandybrook Subdivision WI2682639 | 474 | 0 | 0 | 1 | 0.1 ppbbelow the action level |
| St Johns Northwestern Academies WI2680761 | 340 | 0 | 0 | 2 | 8.8 ppbbelow the action level |
| Arbors WI2682795 | 280 | 0 | 0 | 1 | 0.2 ppbbelow the action level |
| Emerald Woods Condos WI2685370 | 150 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Norris INC WI2680246 | 141 | 0 | 0 | 2 | 0.7 ppbbelow the action level |
| Willow Glen Apartments WI2683555 | 80 | 0 | 0 | 2 | 1.2 ppbbelow the action level |
| Apartments of Stoneridge WI2682761 | 75 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Knollcrest WI2681104 | 66 | 0 | 0 | 1 | 13.6 ppbbelow the action level |
| Cambridge Place of Delafield WI2686325 | 50 | 0 | 0 | 1 | 0.2 ppbbelow the action level |
| Carriage Hills Condominiums WI2682406 | 50 | 0 | 0 | 2 | 1.3 ppbbelow the action level |
| Hills of Wales Apts WI2680236 | 50 | 0 | 0 | 1 | 1.9 ppbbelow the action level |
| Evergreens WI2680290 | 40 | 0 | 0 | 1 | 1.4 ppbbelow the action level |
| Sanctuary of Delafield WI2685951 | 27 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Butler Waterworks WI2680191 | 2,181 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Eagle Waterworks WI2680198 | 1,950 | 0 | 0 | 0 | 3.8 ppbbelow the action level |
| Menomonee Falls Ww - Groundwater WI2685747 | 1,796 | 0 | 0 | 0 | 0.6 ppbbelow the action level |
| Lake Meadows Water Trust WI2680228 | 750 | 0 | 0 | 0 | 3.1 ppbbelow the action level |
| Hale Park Meadows WI2680216 | 720 | 0 | 0 | 0 | 6.4 ppbbelow the action level |
| Durham Meadows Water Trust WI2680213 | 700 | 0 | 0 | 0 | 0.8 ppbbelow the action level |
| Delafield Square WI2685812 | 587 | 0 | 0 | 0 | 1.2 ppbbelow the action level |
| Parquelynn Village WI2680261 | 450 | 0 | 0 | 0 | 1.6 ppbbelow the action level |
| Willow Springs MHP 2 & 3 WI2680232 | 446 | 0 | 0 | 0 | 1.0 ppbbelow the action level |
| Squires Grove WI2680201 | 410 | 0 | 0 | 0 | 1.3 ppbbelow the action level |
| Marian Heights Subdivision WI2680203 | 400 | 0 | 0 | 0 | 3.0 ppbbelow the action level |
| Nashotah House WI2682512 | 350 | 0 | 0 | 0 | 11.3 ppbbelow the action level |
| Delafield Waterworks WI2684642 | 300 | 0 | 0 | 0 | 1.9 ppbbelow the action level |
| Sunnyfield Acres WI2680225 | 300 | 0 | 0 | 0 | 0.2 ppbbelow the action level |
| Genesee Lake School South WI2683331 | 230 | 0 | 0 | 0 | 0.4 ppbbelow the action level |
| Marlan Meadows Homeowners Assoc WI2680224 | 210 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Lad Lake WI2680195 | 180 | 0 | 0 | 0 | 0.3 ppbbelow the action level |
| Lannon Water Utility WI2686008 | 172 | 0 | 0 | 0 | 1.0 ppbbelow the action level |
| Oakton Beach WI2681086 | 144 | 0 | 0 | 0 | 1.6 ppbbelow the action level |
| Pioneer Centre WI2680212 | 140 | 0 | 0 | 0 | 4.7 ppbbelow the action level |
| Genesee Lake School North WI2680806 | 110 | 0 | 0 | 0 | 1.2 ppbbelow the action level |
| Heaven City WI2680624 | 106 | 0 | 0 | 0 | 3.3 ppbbelow the action level |
| Lincolnshire Place WI2686481 | 100 | 0 | 0 | 0 | 0.1 ppbbelow the action level |
| Stoney Creek Adult Community WI2684360 | 95 | 0 | 0 | 0 | 0.6 ppbbelow the action level |
| Country Aire Apartments 2 WI2680247 | 90 | 0 | 0 | 0 | 4.2 ppbbelow the action level |
| Lake Country Apartments WI2682229 | 84 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Country Aire Apartments 3 WI2680249 | 80 | 0 | 0 | 0 | 1.3 ppbbelow the action level |
| Schoenstatt Sisters of Mary WI2680242 | 80 | 0 | 0 | 0 | 1.3 ppbbelow the action level |
| Elm Grove Terrace WI2680279 | 75 | 0 | 0 | 0 | 0.4 ppbbelow the action level |
| Mission Lakes II WI2685839 | 68 | 0 | 0 | 0 | 0.8 ppbbelow the action level |
| Douglas Plaza South WI2680862 | 62 | 0 | 0 | 0 | 2.9 ppbbelow the action level |
| Country Court Subdivision WI2684746 | 45 | 0 | 0 | 0 | 0.4 ppbbelow the action level |
| Country Aire Condos 4821 WI2685101 | 40 | 0 | 0 | 0 | 0.6 ppbbelow the action level |
| Country Aire Condos 4835 WI2685210 | 40 | 0 | 0 | 0 | 0.1 ppbbelow the action level |
| Country Aire Condos 4875 WI2685345 | 40 | 0 | 0 | 0 | 0.6 ppbbelow the action level |
| Country Aire Condos 4887 WI2685211 | 40 | 0 | 0 | 0 | 0.5 ppbbelow the action level |
| Delafield Lakes 402 WI2686101 | 40 | 0 | 0 | 0 | 3.2 ppbbelow the action level |
| Delafield Lakes 404 WI2686114 | 40 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Delafield Woods 411 WI2686336 | 40 | 0 | 0 | 0 | 0.2 ppbbelow the action level |
| Delafield Woods 828 WI2686337 | 40 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Muskego Lake Aire Apartments WI2680218 | 35 | 0 | 0 | 0 | 0.7 ppbbelow the action level |
| Douglas Plaza North WI2680288 | 30 | 0 | 0 | 0 | 4.5 ppbbelow the action level |
| Quail Hollow Condos WI2686359 | 30 | 0 | 0 | 0 | 0.1 ppbbelow the action level |
| Wells St Station 425 West WI2686466 | 25 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Wells St Station 435 East WI2686619 | 25 | 0 | 0 | 0 | 0 ppbbelow the action level |
USGS · Monitoring stations
The water, more recently.
Available station readings in Waukesha County, Wisconsin. Each measurement keeps its time, unit and original source.
These readings describe water at a monitoring station. They do not test your tap, measure PFAS or lead, or determine whether water is safe to drink or swim in.
Recent observations load when this section comes into view.
How these readings update
We check for updates every 10 minutes while this section is visible and show supported observations from the last 48 hours. The time beside a reading is when USGS measured it; the checked time is when our service retrieved the response. We mark a reading more than 6 hours old as older. Provisional observations can change after USGS review. A missing reading does not mean zero or clean water.
Temperature, pH, dissolved oxygen, turbidity, conductivity, streamflow and water level are shown only where a station reports them. Different measurements have different units and sampling intervals. USGS data and documentation.
Your next step
Water testing, reports & local help.
Use these official directories to find your drinking-water agency, a certified laboratory and public water records. We have not yet added an individually reviewed local resource list for this county.
Official national directories
Water testing
Find your state’s private-well program
EPA’s state directory points well owners to local program information. Services and eligibility vary by state and county.
Water testing
Find a certified drinking-water laboratory
Use EPA’s directory to reach your state’s laboratory certification program. EPA does not provide on-request testing of residential drinking water.
Public records
Find your utility’s Consumer Confidence Report
EPA links to community water-system reports and explains how to read them. Look for your actual supplier rather than assuming every address in a county shares one system.
Public records
Explore USGS water observations
Find current and historical observations from USGS monitoring locations, including available stream, lake, and groundwater data. Measurements vary by station and do not replace a test of your household water.
A county overview cannot identify every property’s water provider. If you use a public water system, confirm its name on your bill and request its annual Consumer Confidence Report. Private wells need their own testing; public-system records do not describe a private well.
Understand water testing and laboratory reportsResource descriptions are compiled by Tap Water Lookup. Review dates describe our source check, not a new water sample. How we review sources · Suggest a correction
Explore your area
Local coverage in Waukesha County
26ZIP areas in this overview
Explore the water-system records, recent station readings and testing resources on this county page. They describe the systems and stations identified in each section; they are not a separate water test for every community.
Towns and communities
- Big Bend
- Brookfield
- Butler
- Delafield
- Dousman
- Eagle
- Elm Grove
- Hartland
- Lannon
- Menomonee Falls
- Mukwonago
- Muskego
- Nashotah
- New Berlin
- North Prairie
- Okauchee Lake
- Pewaukee
- Summit
- Sussex
- Wales
- Waukesha
View ZIP areas and understand coverage
- 53005Brookfield
- 53007Butler
- 53018Delafield
- 53029Hartland
- 53045Brookfield
- 53046Lannon
- 53051Menomonee Falls
- 53058Nashotah
- 53066Summit
- 53069Okauchee Lake
- 53072Pewaukee
- 53089Sussex
- 53103Big Bend
- 53118Dousman
- 53119Eagle
- 53122Elm Grove
- 53127
- 53146New Berlin
- 53149Mukwonago
- 53150Muskego
- 53151New Berlin
- 53153North Prairie
- 53183Wales
- 53186Waukesha
- 53188Waukesha
- 53189Waukesha
These Census ZIP Code Tabulation Areas are grouped here by their largest county overlap. A ZIP area can cross county lines and contain several water suppliers or private wells. Place labels reflect Census geography, not verified postal city names or utility service boundaries.
Records for these areas are currently presented in this county overview rather than individual ZIP reports. An unpublished report does not mean there are no water records. Confirm your supplier on your water bill; if you use a private well, testing your own well is the relevant next step.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Database prepared 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.
Compiled by Tap Water Lookup from the sources identified on this page. Read the methodology and review process.