County · Wisconsin
Rock County, Wisconsin: drinking water records
Explore EPA records for 20 community water systems across 13 ZIP codes in Rock 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 20 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 20 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 |
|---|---|---|---|---|---|
| Beloit City of WI1540112 | 36,677 | 420 | 1 | 2 | 4.5 ppbbelow the action level |
| Evansville Waterworks WI1540047 | 5,703 | 120 | 0 | 6 | 6.3 ppbbelow the action level |
| Milton Waterworks WI1540130 | 5,588 | 240 | 0 | 1 | 1.5 ppbbelow the action level |
| Edgerton Waterworks WI1540119 | 5,512 | 180 | 0 | 2 | 2.8 ppbbelow the action level |
| Janesville Water Utility WI1540127 | 64,415 | 180 | 0 | 0 | 10 ppbbelow the action level |
| Clinton Waterworks WI1540114 | 2,119 | 120 | 0 | 0 | 0.3 ppbbelow the action level |
| Footville Waterworks WI1540125 | 816 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Caravilla Education and Rehab Center WI1540111 | 298 | 0 | 0 | 1 | 3.0 ppbbelow the action level |
| County Line Estates WI1540135 | 240 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Fulton Utility District WI1541223 | 200 | 0 | 0 | 2 | 2.5 ppbbelow the action level |
| Midway Village Mobile Home Park WI1540124 | 160 | 0 | 0 | 2 | 3.6 ppbbelow the action level |
| Shady Hill Mobile Home Park WI1540115 | 140 | 0 | 0 | 1 | 0.4 ppbbelow the action level |
| Pirates Cove Mobile Home Community WI1540118 | 25 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Orfordville Waterworks WI1540132 | 1,475 | 0 | 0 | 0 | 0.7 ppbbelow the action level |
| Rockvale MHP WI1540126 | 1,200 | 0 | 0 | 0 | 0.7 ppbbelow the action level |
| Rock River Leisure Estates Coop WI1540167 | 650 | 0 | 0 | 0 | 10.1 ppbbelow the action level |
| Oakhill Waterworks WI1540116 | 130 | 0 | 0 | 0 | 1.1 ppbbelow the action level |
| Mountain View MHP 1 WI1540121 | 50 | 0 | 0 | 0 | 1.6 ppbbelow the action level |
| Birchwood Trailer Court WI1540770 | 32 | 0 | 0 | 0 | 0.5 ppbbelow the action level |
| Mountain View MHP 2 WI1541112 | 25 | 0 | 0 | 0 | 2.9 ppbbelow the action level |
USGS · Monitoring stations
The water, more recently.
Available station readings in Rock 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 Rock County
13ZIP 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
- Beloit
- Brodhead
- Clinton
- Edgerton
- Evansville
- Footville
- Janesville
- Milton
- Orfordville
View ZIP areas and understand coverage
- 53501
- 53505
- 53511Beloit
- 53520Brodhead
- 53525Clinton
- 53534Edgerton
- 53536Evansville
- 53537Footville
- 53545Janesville
- 53546Janesville
- 53548Janesville
- 53563Milton
- 53576Orfordville
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.