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Tap water quality report

Granite Falls, MN

EPA monitoring detected 16 contaminants across the 2 water suppliers serving Granite Falls. 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
4,743
people served
16
contaminants found
Minnesota rankings Lead in Minnesota PFAS in Minnesota

What was found in Granite Falls'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
1200 µg/L 12%
of the EPA limit 10000 µg/L
Main supplier: Granite Falls · 2,843 people · 2019
Highest in the city: 2040 µg/L — UPPER SIOUX COMMUNITY · 1,900 people · 2019
2/2 SYR4
Fluoride
1100 µg/L 28%
of the EPA limit 4000 µg/L
Main supplier: Granite Falls · 2,843 people · 2019
2/2 SYR4
Copper
167.45 µg/L 13%
of the EPA limit 1300 µg/L
Main supplier: Granite Falls · 2,843 people · 2017
Highest in the city: 551.5 µg/L — UPPER SIOUX COMMUNITY · 1,900 people · 2018
2/2 SYR4
Barium
29 µg/L 1.5%
of the EPA limit 2000 µg/L
Highest in the city: UPPER SIOUX COMMUNITY · 1,900 people · 2018
1/2 SYR4
Lead
15.64 µg/L 104%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
Main supplier: Granite Falls · 2,843 people · 2017
2/2 SYR4
Total Haloacetic Acids (HAA5)
14.93 µg/L 25%
of the EPA limit 60 µg/L
Highest in the city: UPPER SIOUX COMMUNITY · 1,900 people · 2019
1/2 SYR4
TTHM
5.935 µg/L 7.4%
of the EPA limit 80 µg/L
Highest in the city: UPPER SIOUX COMMUNITY · 1,900 people · 2019
1/2 SYR4
Gross Beta Particle Activity
3.865 pCi/L
No EPA limit set
Highest in the city: UPPER SIOUX COMMUNITY · 1,900 people · 2013
1/2 SYR4
Chloroform
3.315 µg/L
No EPA limit set
Main supplier: Granite Falls · 2,843 people · 2019
1/2 SYR4
Dichloroacetic Acid
3.03 µg/L
No EPA limit set
Main supplier: Granite Falls · 2,843 people · 2019
1/2 SYR4
Gross Alpha, Excl. Radon And U
2.725 pCi/L 18%
of the EPA limit 15 pCi/L
Highest in the city: UPPER SIOUX COMMUNITY · 1,900 people · 2016
1/2 SYR4
Combined Radium (-226 And -228)
2.138 pCi/L 43%
of the EPA limit 5 pCi/L
Highest in the city: UPPER SIOUX COMMUNITY · 1,900 people · 2016
1/2 SYR4
Arsenic
2 µg/L 20%
of the EPA limit 10 µg/L
Highest in the city: UPPER SIOUX COMMUNITY · 1,900 people · 2018
1/2 SYR4
Nitrate
1.15 µg/L 0%
of the EPA limit 10000 µg/L
Highest in the city: UPPER SIOUX COMMUNITY · 1,900 people · 2017
1/2 SYR4
Combined Uranium
0.4731 µg/L 1.6%
of the EPA limit 30 µg/L
Highest in the city: UPPER SIOUX COMMUNITY · 1,900 people · 2013
1/2 SYR4
Lead
0.0100 mg/L 67%
of the EPA limit 0.0150 mg/L
Main supplier: Granite Falls · 2,843 people · 2023
Highest in the city: 0.0130 mg/L — UPPER SIOUX COMMUNITY · 1,900 people · 2022
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 Granite Falls

SupplierPopulation served
Granite Falls 2,843
UPPER SIOUX COMMUNITY 1,900

Frequently asked questions about Granite Falls tap water

Is Granite Falls tap water safe to drink?

EPA testing detected 16 contaminants in the water serving Granite Falls. 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 Granite Falls?

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

What contaminants are in Granite Falls's water?

The contaminants EPA monitoring detected in Granite Falls include Nitrate-Nitrite, Fluoride, Copper, Barium, Lead. 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.