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Tap water quality report

Sioux Falls, SD

EPA monitoring detected 16 contaminants across the 9 water suppliers serving Sioux 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.

9
water suppliers
227,575
people served
16
contaminants found
South Dakota rankings Lead in South Dakota PFAS in South Dakota

What was found in Sioux 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
810 µg/L 8.1%
of the EPA limit 10000 µg/L
Main supplier: SIOUX FALLS · 216,462 people · 2018
Highest in the city: 1200 µg/L — VALLEY VIEW ESTATES · 230 people · 2019
2/9 SYR4
Copper
113.1 µg/L 8.7%
of the EPA limit 1300 µg/L
Main supplier: SIOUX FALLS · 216,462 people · 2018
Highest in the city: 1169 µg/L — PINE LAKE HILLS · 320 people · 2018
7/9 SYR4
Fluoride
460 µg/L 12%
of the EPA limit 4000 µg/L
Highest in the city: TM RURAL WATER DISTRICT · 4,250 people · 2019
3/9 SYR4
Barium
8 µg/L 0.4%
of the EPA limit 2000 µg/L
Main supplier: SIOUX FALLS · 216,462 people · 2019
Highest in the city: 124 µg/L — VALLEY VIEW ESTATES · 230 people · 2013
4/9 SYR4
Lithium
70.9 µg/L
No EPA limit set
Main supplier: SIOUX FALLS · 216,462 people · 2024
Highest in the city: 95 µg/L — TM RURAL WATER DISTRICT · 4,250 people · 2025
3/9 UCMR-5
TTHM
48.2725 µg/L 60%
of the EPA limit 80 µg/L
Main supplier: SIOUX FALLS · 216,462 people · 2019
Highest in the city: 61.94 µg/L — PARADISE WATER COMPANY LLC · 178 people · 2019
7/9 SYR4
Total Haloacetic Acids (HAA5)
16 µg/L 27%
of the EPA limit 60 µg/L
Main supplier: SIOUX FALLS · 216,462 people · 2019
Highest in the city: 21.1 µg/L — LINCOLN COUNTY RURAL WATER SYSTEM · 5,965 people · 2019
6/9 SYR4
Gross Alpha, Excl. Radon And U
6.8 pCi/L 45%
of the EPA limit 15 pCi/L
Highest in the city: PINE LAKE HILLS · 320 people · 2015
2/9 SYR4
Lead
6 µg/L 40%
of the EPA limit 15 µg/L
Main supplier: SIOUX FALLS · 216,462 people · 2018
7/9 SYR4
Gross Beta Particle Activity
4.6 pCi/L
No EPA limit set
Main supplier: SIOUX FALLS · 216,462 people · 2018
1/9 SYR4
Arsenic
1 µg/L 10%
of the EPA limit 10 µg/L
Main supplier: SIOUX FALLS · 216,462 people · 2019
Highest in the city: 2 µg/L — TM RURAL WATER DISTRICT · 4,250 people · 2014
3/9 SYR4
Chromium
1.7 µg/L 1.7%
of the EPA limit 100 µg/L
Highest in the city: VALLEY VIEW ESTATES · 230 people · 2013
3/9 SYR4
Selenium
1.7 µg/L 3.4%
of the EPA limit 50 µg/L
Highest in the city: VALLEY VIEW ESTATES · 230 people · 2013
3/9 SYR4
Antimony, Total
1 µg/L 17%
of the EPA limit 6 µg/L
Main supplier: SIOUX FALLS · 216,462 people · 2019
1/9 SYR4
Lead
0.0030 mg/L 20%
of the EPA limit 0.0150 mg/L
Main supplier: SIOUX FALLS · 216,462 people · 2024
Highest in the city: 0.0090 mg/L — SKYLINE HEIGHTS · 110 people · 2024
9/9 LCR
Pfba
0.0061 µg/L
No EPA limit set
Highest in the city: LINCOLN COUNTY RURAL WATER SYSTEM · 5,965 people · 2024
1/9 UCMR-5
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 Sioux Falls

SupplierPopulation served
SIOUX FALLS 216,462
LINCOLN COUNTY RURAL WATER SYSTEM 5,965
TM RURAL WATER DISTRICT 4,250
PINE LAKE HILLS 320
VALLEY VIEW ESTATES 230
PARADISE WATER COMPANY LLC 178
SKYLINE HEIGHTS 110
GOLDEN HILLS SUBDIVISION 30
TWO BIT RANCH ESTATES 30

Frequently asked questions about Sioux Falls tap water

Is Sioux Falls tap water safe to drink?

EPA testing detected 16 contaminants in the water serving Sioux 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 Sioux Falls?

9 public water suppliers report drinking-water monitoring for Sioux Falls, South Dakota to the EPA. Each is listed above with its population served.

What contaminants are in Sioux Falls's water?

The contaminants EPA monitoring detected in Sioux Falls include Nitrate, Copper, Fluoride, Barium, Lithium. 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.