Dane County Water Quality: 7 Cities Ranked by the Records

Name: Dane County Water Quality Data (2026)
Creator: PurityMap
License: https://creativecommons.org/licenses/by/4.0/

Dane County, Wisconsin: 7 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

Find my system Open on the map Private wells in Dane County

Across the county's systems

Highest result for each contaminant

One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.

Perfluorohexanesulfonic acid (PFHxS)Detected in 2 systems of 7 tested10 ng/L federal MCL (2024) · US EPAHighest7.3 ng/L

MADISON WATER UTILITY7.3 ng/LSample date: 2023-10-02 to 2024-10-08
STOUGHTON WATERWORKS3.6 ng/LSample date: 2024-11-18 to 2025-05-20
MIDDLETON WATERWORKSNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-10-22 to 2025-04-15
OREGON WATERWORKSNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-09-18 to 2025-03-05
SUN PRAIRIE UTILITIESNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-06-15 to 2023-12-05
VERONA WATERWORKSNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-10-02 to 2025-04-16
WAUNAKEE WATERWORKSNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-03-11 to 2025-09-09

Lead (90th percentile)Detected in 7 systems15 µg/L federal action level · US EPAHighest4.97 µg/L

OREGON WATERWORKS4.97 µg/LMonitoring period: 2023–2023
STOUGHTON WATERWORKS4.2 µg/LMonitoring period: 2023–2023
MIDDLETON WATERWORKS4 µg/LMonitoring period: 2023–2023
VERONA WATERWORKS2.86 µg/LMonitoring period: 2023–2023
SUN PRAIRIE UTILITIES2.8 µg/LMonitoring period: 2023–2023
MADISON WATER UTILITY1.8 µg/LMonitoring period: 2023–2023
WAUNAKEE WATERWORKS1.7 µg/LMonitoring period: 2023–2023

Perfluorobutanesulfonic acid (PFBS)Detected in 1 system of 7 tested2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest3.5 ng/L

VERONA WATERWORKS3.5 ng/LSample date: 2024-10-02 to 2025-04-16
MADISON WATER UTILITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-10-02 to 2024-10-08
MIDDLETON WATERWORKSNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-10-22 to 2025-04-15
OREGON WATERWORKSNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-09-18 to 2025-03-05
STOUGHTON WATERWORKSNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-11-18 to 2025-05-20
SUN PRAIRIE UTILITIESNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-06-15 to 2023-12-05
WAUNAKEE WATERWORKSNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-03-11 to 2025-09-09

Perfluorobutanoic acid (PFBA)Detected in 1 system of 7 testedNo federal or state limit; shown for transparencyHighest46.5 ng/L

MADISON WATER UTILITY46.5 ng/LSample date: 2023-10-02 to 2024-10-08
MIDDLETON WATERWORKSNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-10-22 to 2025-04-15
OREGON WATERWORKSNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-09-18 to 2025-03-05
STOUGHTON WATERWORKSNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-11-18 to 2025-05-20
SUN PRAIRIE UTILITIESNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-06-15 to 2023-12-05
VERONA WATERWORKSNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-10-02 to 2025-04-16
WAUNAKEE WATERWORKSNot detected · below 5.0 ng/L lab reporting limitSample date: 2025-03-11 to 2025-09-09

27 substances tested, none detected in any systemShow

Tested in these 7 systems: MADISON WATER UTILITY, MIDDLETON WATERWORKS, OREGON WATERWORKS, STOUGHTON WATERWORKS, SUN PRAIRIE UTILITIES, VERONA WATERWORKS, WAUNAKEE WATERWORKS

11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
Lithium
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
Perfluoro-3-methoxypropanoic acid (PFMPA)
Perfluoro-4-methoxybutanoic acid (PFMBA)
Perfluorodecanoic acid (PFDA)
Perfluorododecanoic acid (PFDoA)
Perfluoroheptanesulfonic acid (PFHpS)
Perfluoroheptanoic acid (PFHpA)
Perfluorohexanoic acid (PFHxA)
Perfluorononanoic acid (PFNA)
Perfluorooctanesulfonic acid (PFOS)
Perfluorooctanoic acid (PFOA)
Perfluoropentanesulfonic acid (PFPeS)
Perfluoropentanoic acid (PFPeA)
Perfluorotetradecanoic acid (PFTA)
Perfluorotridecanoic acid (PFTrDA)
Perfluoroundecanoic acid (PFUnA)

7 cities

Cities ranked by the records

1
WaunakeeWAUNAKEE WATERWORKS
No PFAS detectedLead below action level
Open city report →
2
Sun PrairieSUN PRAIRIE UTILITIES
No PFAS detectedLead below action level
Open city report →
3
VeronaVERONA WATERWORKS
PFAS detected, within limitLead below action level
Open city report →
4
OregonOREGON WATERWORKS
No PFAS detectedLead below action level
Open city report →
5
MiddletonMIDDLETON WATERWORKS
No PFAS detectedLead below action level
Open city report →
6
StoughtonSTOUGHTON WATERWORKS
PFAS detected, within limitLead below action level
Open city report →
7
MadisonMADISON WATER UTILITY
PFAS detected, within limitLead below action level
Open city report →

Showing 6 of 7 cities · scores are system-level, not tap tests

Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.

PFAS in Dane CountyPFAS detected in 3 of 7 cities; none had a sample above a 2024 EPA limit

4.0 ng/L federal MCL · PFOS, ng/LPFAS in Wisconsin

Lead

0of 7 cities above the 15 µg/L action level

Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.

Lead in Wisconsin

Who supplies the county

Largest water systems

MadisonMADISON WATER UTILITY · WI1130224
272,000 served
Sun PrairieSUN PRAIRIE UTILITIES · WI1130258
39,300 served
MiddletonMIDDLETON WATERWORKS · WI1130242
23,868 served
WaunakeeWAUNAKEE WATERWORKS · WI1130265
14,879 served
VeronaVERONA WATERWORKS · WI1130259
14,030 served
StoughtonSTOUGHTON WATERWORKS · WI1130078
13,078 served
OregonOREGON WATERWORKS · WI1130251
11,200 served

Questions

Frequently asked

How does Dane County tap water compare across cities?

PurityMap ranks 7 cities in Dane County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Waunakee's main water system: WAUNAKEE WATERWORKS · PWSID WI1130265 · Purity Score 98 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.

How many Dane County cities had a PFAS sample above a 2024 EPA limit?

None of the 7 Dane County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing. PFAS were detected below the limit in 3.

Is there lead in Dane County tap water?

Utilities report lead as a 90th-percentile result from home taps. 7 of 7 Dane County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

Have Dane County water systems had drinking-water violations?

1 city in Dane County has a health-based violation in the federal SDWIS record within about the last ten years. Each city report lists the contaminant, year and whether it was resolved.

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