St. Croix County Water Quality: 2 Cities Ranked by the Records
St. Croix County, Wisconsin: 2 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.
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.
LithiumDetected in 1 system of 2 tested10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest16 µg/L
- HUDSON WATERWORKS16 µg/LSample date: 2023-05-09 to 2023-11-14
- NEW RICHMOND WATERWORKSNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-05-17 to 2023-11-08
Lead (90th percentile)Detected in 2 systems15 µg/L federal action level · US EPAHighest6.1 µg/L
- HUDSON WATERWORKS6.1 µg/LMonitoring period: 2023–2023
- NEW RICHMOND WATERWORKS1.5 µg/LMonitoring period: 2023–2023
Perfluorobutanoic acid (PFBA)Detected in 2 systemsNo federal or state limit; shown for transparencyHighest32 ng/L
- HUDSON WATERWORKS32 ng/LSample date: 2023-05-09 to 2024-07-31
- NEW RICHMOND WATERWORKS6.4 ng/LSample date: 2023-05-17 to 2023-11-08
28 PFAS tested, none detected in any systemShow
Tested in these 2 systems: HUDSON WATERWORKS, NEW RICHMOND 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)
- 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)
- Perfluorobutanesulfonic acid (PFBS)
- Perfluorodecanoic acid (PFDA)
- Perfluorododecanoic acid (PFDoA)
- Perfluoroheptanesulfonic acid (PFHpS)
- Perfluoroheptanoic acid (PFHpA)
- Perfluorohexanesulfonic acid (PFHxS)
- 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)
Cities ranked by the records
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.
0of 2 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 WisconsinLargest water systems
- HudsonHUDSON WATERWORKS · WI656008718,558 served
- New RichmondNEW RICHMOND WATERWORKS · WI656012610,824 served
Frequently asked
How does St. Croix County tap water compare across cities?
PurityMap ranks 2 cities in St. Croix 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 New Richmond's main water system: NEW RICHMOND WATERWORKS · PWSID WI6560126 · 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 St. Croix County cities have PFAS above the federal limit?
None of the 2 St. Croix County cities on record had a regulated PFAS above the 2024 federal limit in EPA's UCMR 5 testing. PFAS were detected below the limit in 2.
Is there lead in St. Croix County tap water?
Utilities report lead as a 90th-percentile result from home taps. 2 of 2 St. Croix 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.
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