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Tap water quality report

Prior Lake, MN

EPA monitoring detected 22 contaminants across the 3 water suppliers serving Prior Lake. 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
50,541
people served
22
contaminants found
Minnesota rankings Lead in Minnesota PFAS in Minnesota

What was found in Prior Lake'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
5200 µg/L 52%
of the EPA limit 10000 µg/L
Highest in the city: NORTH WATER TREATMENT PLANT (NWTP) · 300 people · 2017
2/3 SYR4
Fluoride
948 µg/L 24%
of the EPA limit 4000 µg/L
Main supplier: Prior Lake · 25,282 people · 2019
Highest in the city: 2550 µg/L — NORTH WATER TREATMENT PLANT (NWTP) · 300 people · 2019
3/3 SYR4
Copper
1237.5 µg/L 95%
of the EPA limit 1300 µg/L
Main supplier: Prior Lake · 25,282 people · 2019
3/3 SYR4
Barium
327.18 µg/L 16%
of the EPA limit 2000 µg/L
Main supplier: Prior Lake · 25,282 people · 2018
3/3 SYR4
Nitrate-Nitrite
260 µg/L 2.6%
of the EPA limit 10000 µg/L
Main supplier: Prior Lake · 25,282 people · 2019
3/3 SYR4
Lithium
18.6 µg/L
No EPA limit set
Main supplier: Prior Lake · 25,282 people · 2025
1/3 UCMR-5
Chloroform
13.2 µg/L
No EPA limit set
Main supplier: Prior Lake · 25,282 people · 2019
1/3 SYR4
Lead
8.3 µg/L 55%
of the EPA limit 15 µg/L
Main supplier: Prior Lake · 25,282 people · 2019
3/3 SYR4
Arsenic
7.09 µg/L 71%
of the EPA limit 10 µg/L
Main supplier: Prior Lake · 25,282 people · 2018
1/3 SYR4
Gross Alpha, Excl. Radon And U
6.2 pCi/L 41%
of the EPA limit 15 pCi/L
Main supplier: Prior Lake · 25,282 people · 2018
1/3 SYR4
TTHM
5.35 µg/L 6.7%
of the EPA limit 80 µg/L
Highest in the city: SOUTH WATER TREATMENT PLANT (SWTP) · 24,959 people · 2019
2/3 SYR4
Bromodichloromethane
4.32 µg/L
No EPA limit set
Main supplier: Prior Lake · 25,282 people · 2019
1/3 SYR4
Dibromochloromethane
3.67 µg/L
No EPA limit set
Main supplier: Prior Lake · 25,282 people · 2019
1/3 SYR4
Dichloroacetic Acid
2.83 µg/L
No EPA limit set
Main supplier: Prior Lake · 25,282 people · 2019
1/3 SYR4
Total Haloacetic Acids (HAA5)
2.245 µg/L 3.7%
of the EPA limit 60 µg/L
Highest in the city: SOUTH WATER TREATMENT PLANT (SWTP) · 24,959 people · 2015
2/3 SYR4
Xylenes, Total
2.07 µg/L 0%
of the EPA limit 10000 µg/L
Highest in the city: NORTH WATER TREATMENT PLANT (NWTP) · 300 people · 2017
1/3 SYR4
Trichloroacetic Acid
1.63 µg/L
No EPA limit set
Main supplier: Prior Lake · 25,282 people · 2019
1/3 SYR4
Dibromoacetic Acid
1.575 µg/L
No EPA limit set
Main supplier: Prior Lake · 25,282 people · 2019
1/3 SYR4
Bromoform
1.445 µg/L
No EPA limit set
Main supplier: Prior Lake · 25,282 people · 2019
1/3 SYR4
Combined Radium (-226 And -228)
1.1 pCi/L 22%
of the EPA limit 5 pCi/L
Highest in the city: NORTH WATER TREATMENT PLANT (NWTP) · 300 people · 2019
1/3 SYR4
Chromium
0.2725 µg/L 0.3%
of the EPA limit 100 µg/L
Main supplier: Prior Lake · 25,282 people · 2018
1/3 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: Prior Lake · 25,282 people · 2025
Highest in the city: 0.0011 mg/L — NORTH WATER TREATMENT PLANT (NWTP) · 300 people · 2022
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 Prior Lake

SupplierPopulation served
Prior Lake 25,282
SOUTH WATER TREATMENT PLANT (SWTP) 24,959
NORTH WATER TREATMENT PLANT (NWTP) 300

Frequently asked questions about Prior Lake tap water

Is Prior Lake tap water safe to drink?

EPA testing detected 22 contaminants in the water serving Prior Lake. 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 Prior Lake?

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

What contaminants are in Prior Lake's water?

The contaminants EPA monitoring detected in Prior Lake include Nitrate, Fluoride, Copper, Barium, Nitrate-Nitrite. 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.