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Tap water quality report

Winona, MN

EPA monitoring detected 16 contaminants across the 3 water suppliers serving Winona. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

3
water suppliers
32,026
people served
16
contaminants found
Minnesota rankings Lead in Minnesota PFAS in Minnesota

What was found in Winona's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Fluoride
1400 µg/L 35%
of the EPA limit 4000 µg/L
Main supplier: Winona · 27,782 people · 2019
2/3 SYR4
Copper
124.1 µg/L 9.5%
of the EPA limit 1300 µg/L
Main supplier: Winona · 27,782 people · 2019
Highest in the city: 1191.5 µg/L — Goodview · 4,158 people · 2019
3/3 SYR4
Nitrate-Nitrite
140 µg/L 1.4%
of the EPA limit 10000 µg/L
Main supplier: Winona · 27,782 people · 2019
1/3 SYR4
Lead
4.42 µg/L 29%
of the EPA limit 15 µg/L
Main supplier: Winona · 27,782 people · 2019
Highest in the city: 60.08 µg/L — Goodview · 4,158 people · 2019
3/3 SYR4
Barium
56.495 µg/L 2.8%
of the EPA limit 2000 µg/L
Main supplier: Winona · 27,782 people · 2019
3/3 SYR4
Lithium
50.1 µg/L
No EPA limit set
Main supplier: Winona · 27,782 people · 2024
2/3 UCMR-5
Gross Alpha, Excl. Radon And U
11.75 pCi/L 78%
of the EPA limit 15 pCi/L
Main supplier: Winona · 27,782 people · 2019
3/3 SYR4
Bromoform
11.04 µg/L
No EPA limit set
Main supplier: Winona · 27,782 people · 2019
2/3 SYR4
Dibromoacetic Acid
5.94 µg/L
No EPA limit set
Main supplier: Winona · 27,782 people · 2019
1/3 SYR4
Dibromochloromethane
5.625 µg/L
No EPA limit set
Main supplier: Winona · 27,782 people · 2019
1/3 SYR4
Bromodichloromethane
2.13 µg/L
No EPA limit set
Main supplier: Winona · 27,782 people · 2019
1/3 SYR4
Dichloroacetic Acid
1.29 µg/L
No EPA limit set
Main supplier: Winona · 27,782 people · 2019
1/3 SYR4
Chloroform
0.9600 µg/L
No EPA limit set
Main supplier: Winona · 27,782 people · 2019
1/3 SYR4
Chromium
0.3860 µg/L 0.4%
of the EPA limit 100 µg/L
Main supplier: Winona · 27,782 people · 2019
1/3 SYR4
Mercury
0.0320 µg/L 1.6%
of the EPA limit 2 µg/L
Highest in the city: Goodview · 4,158 people · 2019
1/3 SYR4
Lead
0.0020 mg/L 13%
of the EPA limit 0.0150 mg/L
Main supplier: Winona · 27,782 people · 2025
3/3 LCR
Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of the system's samples — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Winona

SupplierPopulation served
Winona 27,782
Goodview 4,158
Green Terrace Mobile Estates 86

Frequently asked questions about Winona tap water

Is Winona tap water safe to drink?

EPA testing detected 16 contaminants in the water serving Winona. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Winona?

3 public water suppliers report drinking-water monitoring for Winona, Minnesota to the EPA. Each is listed above with its population served.

What contaminants are in Winona's water?

The contaminants EPA monitoring detected in Winona include Fluoride, Copper, Nitrate-Nitrite, Lead, Barium. The full list, with the level at the main supplier and the data source, is in the table above.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.