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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 highest level found 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 highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Copper
1330 µg/L 102%
of the EPA limit, in the worst sample — 1300 µg/L
 7/9 SYR4
Nitrate
1200 µg/L 12%
of the EPA limit 10000 µg/L
 2/9 SYR4
Fluoride
460 µg/L 12%
of the EPA limit 4000 µg/L
 3/9 SYR4
Barium
124 µg/L 6.2%
of the EPA limit 2000 µg/L
 4/9 SYR4
Lithium
95 µg/L
No EPA limit set
 3/9 UCMR-5
TTHM
71 µg/L 89%
of the EPA limit 80 µg/L
 7/9 SYR4
Lead
27 µg/L 180%
of the EPA limit, in the worst sample — 15 µg/L
 7/9 SYR4
Total Haloacetic Acids (HAA5)
26 µg/L 43%
of the EPA limit 60 µg/L
 6/9 SYR4
Gross Alpha, Excl. Radon And U
6.8 pCi/L 45%
of the EPA limit 15 pCi/L
 2/9 SYR4
Gross Beta Particle Activity
4.6 pCi/L
No EPA limit set
 1/9 SYR4
Arsenic
2 µg/L 20%
of the EPA limit 10 µg/L
 3/9 SYR4
Chromium
1.7 µg/L 1.7%
of the EPA limit 100 µg/L
 3/9 SYR4
Selenium
1.7 µg/L 3.4%
of the EPA limit 50 µg/L
 3/9 SYR4
Antimony, Total
1 µg/L 17%
of the EPA limit 6 µg/L
 1/9 SYR4
Lead
0.0090 mg/L 60%
of the EPA limit 0.0150 mg/L
 9/9 LCR
Pfba
0.0061 µg/L
No EPA limit set
 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 single worst sample on record — 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 Copper, Nitrate, Fluoride, Barium, Lithium. The full list, with the highest level found 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.