Tap WaterIndex

← Nebraska

Tap water quality report

South Sioux City, NE

EPA monitoring detected 14 contaminants across the 2 water suppliers serving South Sioux City. 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
14,143
people served
14
contaminants found
Nebraska rankings Lead in Nebraska PFAS in Nebraska

What was found in South Sioux City'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
Copper
447.7 µg/L 34%
of the EPA limit 1300 µg/L
Main supplier: SOUTH SIOUX CITY, CITY OF · 14,043 people · 2019
1/2 SYR4
Lithium
97.3 µg/L
No EPA limit set
Main supplier: SOUTH SIOUX CITY, CITY OF · 14,043 people · 2024
1/2 UCMR-5
TTHM
37.4 µg/L 47%
of the EPA limit 80 µg/L
Main supplier: SOUTH SIOUX CITY, CITY OF · 14,043 people · 2019
1/2 SYR4
Chloroform
17.03 µg/L
No EPA limit set
Main supplier: SOUTH SIOUX CITY, CITY OF · 14,043 people · 2019
1/2 SYR4
Total Haloacetic Acids (HAA5)
16.815 µg/L 28%
of the EPA limit 60 µg/L
Main supplier: SOUTH SIOUX CITY, CITY OF · 14,043 people · 2019
1/2 SYR4
Bromodichloromethane
13.1 µg/L
No EPA limit set
Main supplier: SOUTH SIOUX CITY, CITY OF · 14,043 people · 2019
1/2 SYR4
Lead
10.93 µg/L 73%
of the EPA limit 15 µg/L
Main supplier: SOUTH SIOUX CITY, CITY OF · 14,043 people · 2019
1/2 SYR4
Dibromochloromethane
9.143 µg/L
No EPA limit set
Main supplier: SOUTH SIOUX CITY, CITY OF · 14,043 people · 2019
1/2 SYR4
Monochloroacetic Acid
8.497 µg/L
No EPA limit set
Main supplier: SOUTH SIOUX CITY, CITY OF · 14,043 people · 2019
1/2 SYR4
Dichloroacetic Acid
7.54 µg/L
No EPA limit set
Main supplier: SOUTH SIOUX CITY, CITY OF · 14,043 people · 2019
1/2 SYR4
Trichloroacetic Acid
7.375 µg/L
No EPA limit set
Main supplier: SOUTH SIOUX CITY, CITY OF · 14,043 people · 2019
1/2 SYR4
Dibromoacetic Acid
2.3625 µg/L
No EPA limit set
Main supplier: SOUTH SIOUX CITY, CITY OF · 14,043 people · 2019
1/2 SYR4
Bromoform
1.778 µg/L
No EPA limit set
Main supplier: SOUTH SIOUX CITY, CITY OF · 14,043 people · 2019
1/2 SYR4
Lead
0.0011 mg/L 7.3%
of the EPA limit 0.0150 mg/L
Main supplier: SOUTH SIOUX CITY, CITY OF · 14,043 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 South Sioux City

SupplierPopulation served
SOUTH SIOUX CITY, CITY OF 14,043
CRYSTAL LAKE MHP, LLC 100

Frequently asked questions about South Sioux City tap water

Is South Sioux City tap water safe to drink?

EPA testing detected 14 contaminants in the water serving South Sioux City. 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 South Sioux City?

2 public water suppliers report drinking-water monitoring for South Sioux City, Nebraska to the EPA. Each is listed above with its population served.

What contaminants are in South Sioux City's water?

The contaminants EPA monitoring detected in South Sioux City include Copper, Lithium, TTHM, Chloroform, Total Haloacetic Acids (HAA5). 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.