County · Wisconsin

Grant County, Wisconsin: drinking water records

Name: Drinking water records for Grant County, Wisconsin
Creator: U.S. Environmental Protection Agency
License: https://www.usa.gov/government-works

Explore EPA records for 28 community water systems across 21 ZIP codes in Grant County, then find water-testing resources and available recent monitoring-station readings.

In focus28Community water systems

Public records. Clearer context.

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 3 of the 28 listed systems in this snapshot. A system with no reported PFAS detection is not a test of every tap or every contaminant.

systems in EPA's PFAS survey

systems where PFAS was found

systems at or above the PFOA or PFOS limit, on the yearly-average basis EPA uses

systems that have reached the lead action level

systems with a health-based violation since 2016

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 28 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	Health-based violations	Lead, 9 in 10 homes at or below
Platteville Waterworks WI1220115	12,268	180	0	10.3 ppbbelow the action level
Lancaster Waterworks WI1220107	3,907	180	0	1.8 ppbbelow the action level
Cuba City Waterworks WI1220092	2,141	0	1	0 ppbbelow the action level
Hazel Green Waterworks WI1220102	1,193	0	2	2.8 ppbbelow the action level
Cassville Waterworks WI1220091	777	0	1	15.1 ppbat or above the action level
Montfort Waterworks WI1220110	718	0	2	1.1 ppbbelow the action level
Potosi Waterworks WI1220117	718	0	2	1.7 ppbbelow the action level
Bloomington Waterworks WI1220085	682	60	0	1.2 ppbbelow the action level
Kieler Sd No 1 WI1220103	560	0	1	0 ppbbelow the action level
Tennyson Waterworks WI1220120	367	0	2	3.8 ppbbelow the action level
Bagley Waterworks WI1220084	353	0	1	3.8 ppbbelow the action level
Mount Hope Waterworks WI1220111	181	0	1	1.5 ppbbelow the action level
Stitzer Sanitary Dist 1 WI1220047	150	0	2	0 ppbbelow the action level
Maryville Sd 2 WI1220105	100	0	1	0.7 ppbbelow the action level
Oak Park Community WI1220095	90	0	2	1.3 ppbbelow the action level
Bluffside Court WI1220090	40	0	1	1.0 ppbbelow the action level
Stateline Mobile Home Park WI1220100	37	0	2	0 ppbbelow the action level
Boscobel Waterworks WI1220089	3,237	0	0	1.1 ppbbelow the action level
Fennimore Waterworks WI1220096	2,507	0	0	1.6 ppbbelow the action level
Muscoda Waterworks WI1220112	1,453	0	0	2.6 ppbbelow the action level
Dickeyville Waterworks WI1220094	1,069	0	0	0 ppbbelow the action level
Livingston Waterworks WI1220109	664	0	0	0.9 ppbbelow the action level
Blue River Waterworks WI1220087	424	0	0	0 ppbbelow the action level
Sinsinawa Dominicans INC WI1220118	213	0	0	0 ppbbelow the action level
Patch Grove Waterworks WI1220113	160	0	0	0 ppbbelow the action level
Cozy Acres MHP WI1220088	80	0	0	2.1 ppbbelow the action level
Patriot Park WI1220114	80	0	0	0.8 ppbbelow the action level
River Vista Estates LLC WI1220121	30	0	0	4.1 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 Grant 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.

U.S. Environmental Protection Agency
Source reviewed 2026-09-15 · Source updated 2026-08-05

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.

U.S. Environmental Protection Agency
Source reviewed 2026-09-15 · Source updated 2026-08-11

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.

U.S. Environmental Protection Agency
Source reviewed 2026-09-15 · Source updated 2026-09-09

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.

U.S. Geological Survey
Source reviewed 2026-09-15

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 reports

Resource 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 Grant County

21ZIP 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

Bagley
Bloomington
Boscobel
Cassville
Cuba City
Dickeyville
Fennimore
Glen Haven
Kieler
Lancaster
Livingston
Montfort
Mount Hope
Muscoda
Patch Grove
Platteville
Potosi
Sandy Hook
Woodman

Explore water-system records Find water-testing resources

View ZIP areas and understand coverage

53554Livingston
53569Montfort
53573Muscoda
53801Bagley
53802
53804Bloomington
53805Boscobel
53806Cassville
53807Cuba City
53808Dickeyville
53809Fennimore
53810Glen Haven
53811Sandy Hook
53812Kieler
53813Lancaster
53816Mount Hope
53817Patch Grove
53818Platteville
53820Potosi
53825
53827Woodman

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.

Beyond this county page

Keep reading. Compare nearby.

PFASReading PFAS survey resultsWhat a detection, a reporting level and a yearly average mean in EPA’s PFAS survey records.LeadChoosing a lead filter6 systems here have reached the lead action level. See how to check a filter’s lead-reduction certification.Your utilityFind your annual water reportConfirm the supplier on your bill, then read its Consumer Confidence Report for local results.

Counties near Grant County

All Wisconsin counties

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.