Tap WaterIndex

← Minnesota

Tap water quality report

Willmar, MN

EPA monitoring detected 15 contaminants across the 2 water suppliers serving Willmar. 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.

2
water suppliers
21,135
people served
15
contaminants found
Minnesota rankings Lead in Minnesota PFAS in Minnesota

What was found in Willmar'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
Copper
1535.5 µg/L 118%
of the EPA limit, at the 95th percentile of samples — 1300 µg/L
Main supplier: Willmar · 21,045 people · 2019
2/2 SYR4
Fluoride
1200 µg/L 30%
of the EPA limit 4000 µg/L
Main supplier: Willmar · 21,045 people · 2019
1/2 SYR4
Barium
325.45 µg/L 16%
of the EPA limit 2000 µg/L
Main supplier: Willmar · 21,045 people · 2015
1/2 SYR4
Nitrate-Nitrite
100 µg/L 1%
of the EPA limit 10000 µg/L
Main supplier: Willmar · 21,045 people · 2019
1/2 SYR4
Lithium
35.7 µg/L
No EPA limit set
Main supplier: Willmar · 21,045 people · 2024
1/2 UCMR-5
Lead
8.8 µg/L 59%
of the EPA limit 15 µg/L
Main supplier: Willmar · 21,045 people · 2019
Highest in the city: 15.41 µg/L — Sunray Glacial Waters INC · 90 people · 2017
2/2 SYR4
Dichloroacetic Acid
7.05 µg/L
No EPA limit set
Main supplier: Willmar · 21,045 people · 2019
Highest in the city: 11.19 µg/L — Sunray Glacial Waters INC · 90 people · 2018
2/2 SYR4
Chloroform
2.625 µg/L
No EPA limit set
Main supplier: Willmar · 21,045 people · 2019
Highest in the city: 6.52 µg/L — Sunray Glacial Waters INC · 90 people · 2019
2/2 SYR4
Gross Alpha, Excl. Radon And U
3.4 pCi/L 23%
of the EPA limit 15 pCi/L
Highest in the city: Sunray Glacial Waters INC · 90 people · 2015
1/2 SYR4
Monochloroacetic Acid
3 µg/L
No EPA limit set
Highest in the city: Sunray Glacial Waters INC · 90 people · 2018
1/2 SYR4
Trichloroacetic Acid
1.57 µg/L
No EPA limit set
Main supplier: Willmar · 21,045 people · 2019
Highest in the city: 1.71 µg/L — Sunray Glacial Waters INC · 90 people · 2018
2/2 SYR4
Bromodichloromethane
1.6 µg/L
No EPA limit set
Main supplier: Willmar · 21,045 people · 2019
2/2 SYR4
Arsenic
1.1985 µg/L 12%
of the EPA limit 10 µg/L
Main supplier: Willmar · 21,045 people · 2015
1/2 SYR4
Chromium
0.2820 µg/L 0.3%
of the EPA limit 100 µg/L
Main supplier: Willmar · 21,045 people · 2015
1/2 SYR4
Lead
0.0020 mg/L 13%
of the EPA limit 0.0150 mg/L
Main supplier: Willmar · 21,045 people · 2025
Highest in the city: 0.0030 mg/L — Sunray Glacial Waters INC · 90 people · 2023
2/2 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 Willmar

SupplierPopulation served
Willmar 21,045
Sunray Glacial Waters INC 90

Frequently asked questions about Willmar tap water

Is Willmar tap water safe to drink?

EPA testing detected 15 contaminants in the water serving Willmar. 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 Willmar?

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

What contaminants are in Willmar's water?

The contaminants EPA monitoring detected in Willmar include Copper, Fluoride, Barium, Nitrate-Nitrite, Lithium. 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.