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Tap water quality report

Big Lake, MN

EPA monitoring detected 16 contaminants across the 1 water supplier serving Big 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.

1
water supplier
13,056
people served
16
contaminants found
Minnesota rankings Lead in Minnesota PFAS in Minnesota

What was found in Big 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-Nitrite
5830 µg/L 58%
of the EPA limit 10000 µg/L
Main supplier: Big Lake · 13,056 people · 2019
1/1 SYR4
Fluoride
1100 µg/L 28%
of the EPA limit 4000 µg/L
Main supplier: Big Lake · 13,056 people · 2019
1/1 SYR4
Copper
393.5 µg/L 30%
of the EPA limit 1300 µg/L
Main supplier: Big Lake · 13,056 people · 2019
1/1 SYR4
Barium
62.8 µg/L 3.1%
of the EPA limit 2000 µg/L
Main supplier: Big Lake · 13,056 people · 2017
1/1 SYR4
Gross Alpha, Excl. Radon And U
12.7 pCi/L 85%
of the EPA limit 15 pCi/L
Main supplier: Big Lake · 13,056 people · 2019
1/1 SYR4
Lead
8.5 µg/L 57%
of the EPA limit 15 µg/L
Main supplier: Big Lake · 13,056 people · 2019
1/1 SYR4
Chloroform
5.55 µg/L
No EPA limit set
Main supplier: Big Lake · 13,056 people · 2019
1/1 SYR4
Bromodichloromethane
5.325 µg/L
No EPA limit set
Main supplier: Big Lake · 13,056 people · 2019
1/1 SYR4
Dibromochloromethane
4.125 µg/L
No EPA limit set
Main supplier: Big Lake · 13,056 people · 2019
1/1 SYR4
Dichloroacetic Acid
2.375 µg/L
No EPA limit set
Main supplier: Big Lake · 13,056 people · 2019
1/1 SYR4
Dibromoacetic Acid
1.625 µg/L
No EPA limit set
Main supplier: Big Lake · 13,056 people · 2019
1/1 SYR4
Trichloroacetic Acid
1.59 µg/L
No EPA limit set
Main supplier: Big Lake · 13,056 people · 2019
1/1 SYR4
Bromoform
1.09 µg/L
No EPA limit set
Main supplier: Big Lake · 13,056 people · 2019
1/1 SYR4
Pfba
0.0155 µg/L
No EPA limit set
Main supplier: Big Lake · 13,056 people · 2024
1/1 UCMR-5
Pfpea
0.0033 µg/L
No EPA limit set
Main supplier: Big Lake · 13,056 people · 2024
1/1 UCMR-5
Lead
0.0010 mg/L 6.7%
of the EPA limit 0.0150 mg/L
Main supplier: Big Lake · 13,056 people · 2025
1/1 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 Big Lake

SupplierPopulation served
Big Lake 13,056

Frequently asked questions about Big Lake tap water

Is Big Lake tap water safe to drink?

EPA testing detected 16 contaminants in the water serving Big 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 Big Lake?

1 public water supplier report drinking-water monitoring for Big Lake, Minnesota to the EPA. Each is listed above with its population served.

What contaminants are in Big Lake's water?

The contaminants EPA monitoring detected in Big Lake include Nitrate-Nitrite, Fluoride, Copper, Barium, Gross Alpha, Excl. Radon And U. 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.