Tap WaterIndex

← Minnesota

Tap water quality report

Duluth, MN

EPA monitoring detected 11 contaminants across the 2 water suppliers serving Duluth. 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
87,944
people served
11
contaminants found
Minnesota rankings Lead in Minnesota PFAS in Minnesota

What was found in Duluth'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
Fluoride
878 µg/L 22%
of the EPA limit 4000 µg/L
Main supplier: Duluth · 86,859 people · 2019
1/2 SYR4
Nitrate-Nitrite
390 µg/L 3.9%
of the EPA limit 10000 µg/L
Main supplier: Duluth · 86,859 people · 2019
1/2 SYR4
Copper
101.85 µg/L 7.8%
of the EPA limit 1300 µg/L
Main supplier: Duluth · 86,859 people · 2019
Highest in the city: 105.35 µg/L — Rice Lake · 1,085 people · 2017
2/2 SYR4
Chloroform
20 µg/L
No EPA limit set
Main supplier: Duluth · 86,859 people · 2019
2/2 SYR4
Lead
17.9 µg/L 119%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
Main supplier: Duluth · 86,859 people · 2019
2/2 SYR4
Dichloroacetic Acid
8.99 µg/L
No EPA limit set
Main supplier: Duluth · 86,859 people · 2019
2/2 SYR4
Trichloroacetic Acid
6.6 µg/L
No EPA limit set
Main supplier: Duluth · 86,859 people · 2019
2/2 SYR4
Bromodichloromethane
3.5 µg/L
No EPA limit set
Main supplier: Duluth · 86,859 people · 2019
2/2 SYR4
Dibromochloromethane
0.6850 µg/L
No EPA limit set
Main supplier: Duluth · 86,859 people · 2019
2/2 SYR4
Chromium
0.4065 µg/L 0.4%
of the EPA limit 100 µg/L
Main supplier: Duluth · 86,859 people · 2018
1/2 SYR4
Lead
0.0080 mg/L 53%
of the EPA limit 0.0150 mg/L
Main supplier: Duluth · 86,859 people · 2025
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 Duluth

SupplierPopulation served
Duluth 86,859
Rice Lake 1,085

Frequently asked questions about Duluth tap water

Is Duluth tap water safe to drink?

EPA testing detected 11 contaminants in the water serving Duluth. 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 Duluth?

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

What contaminants are in Duluth's water?

The contaminants EPA monitoring detected in Duluth include Fluoride, Nitrate-Nitrite, Copper, Chloroform, 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.