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Tap water quality report

St. Joseph, MN

EPA monitoring detected 16 contaminants across the 2 water suppliers serving St. Joseph. 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
8,700
people served
16
contaminants found
Minnesota rankings Lead in Minnesota PFAS in Minnesota

What was found in St. Joseph'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
Nitrate-Nitrite
1590 µg/L 16%
of the EPA limit 10000 µg/L
Main supplier: Saint Joseph · 7,100 people · 2019
2/2 SYR4
Fluoride
1340 µg/L 34%
of the EPA limit 4000 µg/L
Main supplier: Saint Joseph · 7,100 people · 2019
1/2 SYR4
Copper
281.2 µg/L 22%
of the EPA limit 1300 µg/L
Main supplier: Saint Joseph · 7,100 people · 2017
Highest in the city: 287.5 µg/L — College of St. Benedict · 1,600 people · 2018
2/2 SYR4
Barium
75.22 µg/L 3.8%
of the EPA limit 2000 µg/L
Main supplier: Saint Joseph · 7,100 people · 2019
Highest in the city: 82.475 µg/L — College of St. Benedict · 1,600 people · 2019
2/2 SYR4
Chloroform
30.6 µg/L
No EPA limit set
Main supplier: Saint Joseph · 7,100 people · 2019
2/2 SYR4
Trichloroacetic Acid
12.985 µg/L
No EPA limit set
Main supplier: Saint Joseph · 7,100 people · 2019
1/2 SYR4
Bromodichloromethane
12 µg/L
No EPA limit set
Main supplier: Saint Joseph · 7,100 people · 2019
2/2 SYR4
Nitrite
10 µg/L 1%
of the EPA limit 1000 µg/L
Highest in the city: College of St. Benedict · 1,600 people · 2016
1/2 SYR4
Lead
6.87 µg/L 46%
of the EPA limit 15 µg/L
Main supplier: Saint Joseph · 7,100 people · 2017
Highest in the city: 9.9 µg/L — College of St. Benedict · 1,600 people · 2018
2/2 SYR4
Dichloroacetic Acid
9.55 µg/L
No EPA limit set
Main supplier: Saint Joseph · 7,100 people · 2019
1/2 SYR4
Dibromochloromethane
4.04 µg/L
No EPA limit set
Main supplier: Saint Joseph · 7,100 people · 2019
2/2 SYR4
Dichloromethane
2.5 µg/L 50%
of the EPA limit 5 µg/L
Main supplier: Saint Joseph · 7,100 people · 2019
1/2 SYR4
Dibromoacetic Acid
1.2 µg/L
No EPA limit set
Main supplier: Saint Joseph · 7,100 people · 2019
1/2 SYR4
P-Dichlorobenzene
0.2300 µg/L 0.3%
of the EPA limit 75 µg/L
Highest in the city: College of St. Benedict · 1,600 people · 2018
1/2 SYR4
Mercury
0.1030 µg/L 5.1%
of the EPA limit 2 µg/L
Main supplier: Saint Joseph · 7,100 people · 2019
1/2 SYR4
Lead
0.0050 mg/L 33%
of the EPA limit 0.0150 mg/L
Main supplier: Saint Joseph · 7,100 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 St. Joseph

SupplierPopulation served
Saint Joseph 7,100
College of St. Benedict 1,600

Frequently asked questions about St. Joseph tap water

Is St. Joseph tap water safe to drink?

EPA testing detected 16 contaminants in the water serving St. Joseph. 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 St. Joseph?

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

What contaminants are in St. Joseph's water?

The contaminants EPA monitoring detected in St. Joseph include Nitrate-Nitrite, Fluoride, Copper, Barium, Chloroform. 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.