County · Wisconsin
Ozaukee County, Wisconsin: drinking water records
Explore EPA records for 48 community water systems across 8 ZIP codes in Ozaukee 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 5 of the 48 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 48 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 |
|---|---|---|---|---|---|
| Port Washington Waterworks WI2460054 | 12,853 | 120 | 0 | 0 | 5.9 ppbbelow the action level |
| Cedarburg L & W Commission WI2460108 | 12,500 | 240 | 0 | 0 | 7.6 ppbbelow the action level |
| Grafton Waterworks WI2460111 | 12,269 | 360 | 0 | 0 | 3.3 ppbbelow the action level |
| Mequon Water Utility WI2460112 | 11,152 | 240 | 0 | 0 | 0.5 ppbbelow the action level |
| Saukville Waterworks WI2460134 | 4,268 | 300 | 9 | 0 | 7.6 ppbbelow the action level |
| Belgium Waterworks WI2460107 | 2,493 | 0 | 0 | 1 | 1.3 ppbbelow the action level |
| Mequon Trail Townhomes WI2460817 | 615 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Pines Subdivision WI2460982 | 200 | 0 | 0 | 1 | 0.1 ppbbelow the action level |
| Osprey Mobile Home Park WI2460113 | 150 | 0 | 0 | 5 | 0.7 ppbbelow the action level |
| Vintage Estates WI2460705 | 130 | 0 | 0 | 1 | 0 ppbbelow the action level |
| River Trails Estates Water Users WI2460680 | 84 | 0 | 0 | 1 | 0.5 ppbbelow the action level |
| Williamsburg 207 209 and 214 WI2460147 | 70 | 0 | 0 | 2 | 0.6 ppbbelow the action level |
| Stonecroft Condominium Assn WI2460114 | 50 | 0 | 0 | 1 | 1.4 ppbbelow the action level |
| Heidel Rd Apts 139 WI2460152 | 40 | 0 | 0 | 2 | 6.0 ppbbelow the action level |
| Pw Lake View Estates LLC WI2460162 | 30 | 0 | 0 | 2 | 0 ppbbelow the action level |
| Mequon Water Trust WI2460131 | 26 | 0 | 0 | 1 | 0 ppbbelow the action level |
| River Garden Apts WI2460139 | 25 | 0 | 0 | 1 | 1.6 ppbbelow the action level |
| Fredonia Waterworks WI2460109 | 2,279 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Concordia University WI2460118 | 1,500 | 0 | 0 | 0 | 0.3 ppbbelow the action level |
| Huntington Park WI2460151 | 600 | 0 | 0 | 0 | 1.7 ppbbelow the action level |
| Beechwood Farms Estates WI2460791 | 300 | 0 | 0 | 0 | 0.3 ppbbelow the action level |
| Westchester Lakes Subdivision WI2460794 | 300 | 0 | 0 | 0 | 0.6 ppbbelow the action level |
| Park Place Subdivision WI2460066 | 260 | 0 | 0 | 0 | 0.5 ppbbelow the action level |
| Brighton Ridge Subdivision WI2460973 | 200 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Haddonstone Subdivision WI2460694 | 195 | 0 | 0 | 0 | 0.3 ppbbelow the action level |
| Country Terrace Condo Homes WI2460128 | 160 | 0 | 0 | 0 | 2.9 ppbbelow the action level |
| Century Estates 1 WI2460143 | 130 | 0 | 0 | 0 | 0.7 ppbbelow the action level |
| Village Heights WI2460145 | 130 | 0 | 0 | 0 | 0.5 ppbbelow the action level |
| Kenilworth Subd WI2460796 | 120 | 0 | 0 | 0 | 0.2 ppbbelow the action level |
| Mequon on the Square Condominium Owners Association INC WI2460955 | 110 | 0 | 0 | 0 | 0.5 ppbbelow the action level |
| Ravine Farms Hm Owners Assoc WI2460124 | 100 | 0 | 0 | 0 | 0.6 ppbbelow the action level |
| River Lake Subdivision WI2460685 | 100 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Woodridge Estates WI2460824 | 100 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Wyngate Subdivision WI2460781 | 100 | 0 | 0 | 0 | 0.5 ppbbelow the action level |
| Linden Lane Apts 117 WI2460142 | 90 | 0 | 0 | 0 | 1.6 ppbbelow the action level |
| Highland Colony Estates Condo WI2460120 | 88 | 0 | 0 | 0 | 1.4 ppbbelow the action level |
| Grand Ave Apartments WI2460640 | 80 | 0 | 0 | 0 | 0.4 ppbbelow the action level |
| Laurel Lakes 608 WI2460137 | 80 | 0 | 0 | 0 | 1.1 ppbbelow the action level |
| Alberta Subdivision WI2460141 | 75 | 0 | 0 | 0 | 0.5 ppbbelow the action level |
| Linden Lane Apts 141 WI2460154 | 75 | 0 | 0 | 0 | 4.6 ppbbelow the action level |
| Mequon Colony Estates WI2460132 | 75 | 0 | 0 | 0 | 0.7 ppbbelow the action level |
| Mequon Parc Apartments LLC WI2460159 | 60 | 0 | 0 | 0 | 0.7 ppbbelow the action level |
| Laurel Lakes 508 WI2460150 | 50 | 0 | 0 | 0 | 0.9 ppbbelow the action level |
| Waters Edge Condominium Association WI2460823 | 50 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Williamsburg 206 WI2460148 | 48 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Heidel Rd Apts 152 WI2460158 | 40 | 0 | 0 | 0 | 2.1 ppbbelow the action level |
| Williamsburg 220 WI2460067 | 32 | 0 | 0 | 0 | 0.2 ppbbelow the action level |
| Village Glen Apts WI2460140 | 30 | 0 | 0 | 0 | 0.8 ppbbelow the action level |
USGS · Monitoring stations
The water, more recently.
Available station readings in Ozaukee 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 Ozaukee County
8ZIP 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
- Belgium
- Cedarburg
- Fredonia
- Grafton
- Mequon
- Port Washington
- Saukville
View ZIP areas and understand coverage
- 53004Belgium
- 53012Cedarburg
- 53021Fredonia
- 53024Grafton
- 53074Port Washington
- 53080Saukville
- 53092Mequon
- 53097Mequon
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.