Tap Water Results

Is Winona, MN tap water safe?

Data: U.S. EPA · How we read the data · How we check it

Summary

No federal limits exceeded in EPA data for Winona Water System.

Winona Water System supplies Winona (27,782 people).

Water system

Winona Water System

27,782 people · Groundwater · EPA ID MN1850013

PFASHighest averageLimitStatus
PFOA
Not detected
–4 pptNot detected
PFOS
Not detected
–4 pptNot detected
PFHxS
Not detected
–10 pptNot detected
PFNA
Not detected
–10 pptNot detected
HFPO-DA (GenX)
Not detected
–10 pptNot detected

ppt = parts per trillion. "Highest average" is the highest average at any of the system's entry points, the way EPA compares results with the limits.

Lead: 2 ppb at the 90th percentile (Dec 2025, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 8

Across Minnesota, 10 of 197 water systems EPA tested had PFAS above a 2024 federal limit, and 7 systems were above the lead action level in results from the last five years. Minnesota results.

Winona homes and lead pipes

74%
of homes built before 1980 (Minnesota 52%, US 50%)
46%
built before 1950 (Minnesota 20%)
42%
of households rent (Minnesota 28%)

Lead service lines and lead solder were allowed until 1986, so homes from before then are the ones to check. Renting? Ask your landlord what the service line is made of, because it's their pipe to replace. How to check your own line.

Housing: Census American Community Survey 2020–2024 5-year estimates for Winona city (tables B25034, B25003). Estimates for small places have a margin of error.

How nearby cities compare

CityMain water systemPFASLead (90th pct.)
Rochester 40 mi
Rochester Water System
Rochester Water SystemNone above limits7 ppb
Owatonna 78 mi
Owatonna Water System
Owatonna Water SystemNone above limits2 ppb
Cottage Grove 81 mi
Cottage Grove Water System
Cottage Grove Water SystemNone above limits3 ppb
Faribault 82 mi
Faribault Water System
Faribault Water SystemNone above limits19 ppb
Rosemount 84 mi
Rosemount Water System
Rosemount Water SystemNone above limits3 ppb
Woodbury 86 mi
Saint Paul Regional Water Services
Saint Paul Regional Water ServicesNone above limits10 ppb
Winona ZIP codes (1)
  • 55987

Questions

Is Winona tap water safe to drink?

Winona Water System had 8 health-based violations since 2016. Utility data can't show lead from your own pipes: if your home was built before 1986, test your tap. Your utility's annual Consumer Confidence Report is the official summary.

Who supplies water in Winona, MN?

Winona Water System, which serves 27,782 people.

Does Winona tap water have PFAS?

None detected above EPA's reporting limits. Winona Water System had no PFAS detected in EPA's 2023–2025 testing. "Not detected" means below the reporting limit (about 2 to 20 ppt), not proven zero.

Do Winona homes have lead pipes?

Census estimates put 74% of Winona homes as built before 1980 (Minnesota: 52%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. Winona Water System's service line inventory says what your line is made of. The only way to know for your home is to check the line where it enters the house and test your tap.

Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.