County · Wisconsin
Walworth County, Wisconsin: drinking water records
Explore EPA records for 30 community water systems across 14 ZIP codes in Walworth 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 6 of the 30 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 30 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 |
|---|---|---|---|---|---|
| Elkhorn Waterworks WI2650062 | 10,317 | 180 | 0 | 6 | 14 ppbbelow the action level |
| Bloomfield, Village of WI2651469 | 4,071 | 120 | 0 | 3 | 1.9 ppbbelow the action level |
| Whitewater Waterworks WI2650056 | 14,000 | 300 | 0 | 0 | 10 ppbbelow the action level |
| Delavan Waterworks WI2650113 | 9,028 | 180 | 0 | 0 | 10 ppbbelow the action level |
| Lake Geneva Utility Commission WI2650066 | 7,107 | 120 | 3 | 0 | 8 ppbbelow the action level |
| East Troy Waterworks WI2650123 | 5,054 | 240 | 1 | 0 | 4.4 ppbbelow the action level |
| Genoa City Waterworks WI2650058 | 2,766 | 0 | 0 | 1 | 4.6 ppbbelow the action level |
| Williams Bay Waterworks WI2650060 | 2,601 | 0 | 0 | 1 | 16 ppbat or above the action level |
| Walworth Waterworks WI2650149 | 2,304 | 0 | 0 | 1 | 6.3 ppbbelow the action level |
| Fontana Water Utility WI2650128 | 1,839 | 0 | 0 | 1 | 3.1 ppbbelow the action level |
| Sharon Waterworks WI2650145 | 1,549 | 0 | 0 | 1 | 1.4 ppbbelow the action level |
| Ludwell Estates WI2650157 | 100 | 0 | 0 | 1 | 5.1 ppbbelow the action level |
| East Troy S D 3 WI2650156 | 40 | 0 | 0 | 1 | 0.7 ppbbelow the action level |
| Lake Como Sanitary Dist 1 WI2651536 | 3,038 | 0 | 0 | 0 | 2.5 ppbbelow the action level |
| Geneva National Community Services WI2650907 | 2,250 | 0 | 0 | 0 | 1.2 ppbbelow the action level |
| Darien Waterworks WI2650057 | 1,573 | 0 | 0 | 0 | 0.9 ppbbelow the action level |
| Country Estates Sanitary District Town of Lyons 1 WI2650127 | 500 | 0 | 0 | 0 | 1.4 ppbbelow the action level |
| Interlaken Resort and Village WI2650143 | 500 | 0 | 0 | 0 | 3.7 ppbbelow the action level |
| Pioneer Estates of Delavan WI2650116 | 400 | 0 | 0 | 0 | 1.2 ppbbelow the action level |
| Delavan Club Condos WI2650929 | 395 | 0 | 0 | 0 | 0.8 ppbbelow the action level |
| Westshire Farms at the Lakes WI2651598 | 300 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Troy Center Sanitary District WI2650146 | 170 | 0 | 0 | 0 | 1.3 ppbbelow the action level |
| Troy Terrace MHP WI2650124 | 150 | 0 | 0 | 0 | 0.9 ppbbelow the action level |
| Coachmans Terrace MHP WI2650150 | 125 | 0 | 0 | 0 | 4.1 ppbbelow the action level |
| Town Hall Apts WI2651216 | 90 | 0 | 0 | 0 | 0.5 ppbbelow the action level |
| Inspiration Ministries & Meadows Apts WI2650148 | 80 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Vintage on the Ponds WI2651311 | 60 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Sage Meadow of Lake Geneva WI2651013 | 33 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Snug Harbor Inn MHP WI2650494 | 30 | 0 | 0 | 0 | 0.3 ppbbelow the action level |
| Geneva Landings WI2651482 | 25 | 0 | 0 | 0 | 0.7 ppbbelow the action level |
Shaded rows report lead at or above the 15 ppb action level in their latest monitoring period. EPA sets that level for the value 9 in 10 sampled homes fall at or below; reaching it requires the utility to act, and it is not a measurement of any single tap. One system in this table is at or above it. What an action level means
USGS · Monitoring stations
The water, more recently.
Available station readings in Walworth 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 Walworth County
14ZIP 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
- Bloomfield
- Darien
- Delavan
- East Troy
- Elkhorn
- Fontana-on-Geneva Lake
- Lake Geneva
- Sharon
- Springfield
- Walworth
- Whitewater
- Williams Bay
View ZIP areas and understand coverage
- 53114Darien
- 53115Delavan
- 53120East Troy
- 53121Elkhorn
- 53125Fontana-on-Geneva Lake
- 53128Bloomfield
- 53147Lake Geneva
- 53157Bloomfield
- 53176Springfield
- 53184Walworth
- 53190Whitewater
- 53191Williams Bay
- 53195
- 53585Sharon
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.