South Sioux City Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

mixed

pH Level

neutral = 7.0

Lead

0.007 mg/L

✓ Below action level

TDS

528 mg/L

Est. Daily Cost

$0.40

energy & soap waste

Source: See methodology section below · Updated 2026

hard~120–179 mg/LHard · est.

0–60

mg/L

Soft

61–120

mg/L

Moderately Hard

121–180

mg/L

Hard

180+

mg/L

Very Hard

Appliance Damage Report

In South Sioux City, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In South Sioux City	Soft Water City	Efficiency Loss
Kettle	6.8 yrs	8.5 yrs	-20%
Washing Machine	9.6 yrs	12 yrs	-20%
Water Heater	12 yrs	15 yrs	-20%

Regional Water Comparison

How South Sioux City compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ South Sioux City, Nebraska	≈ 120–179 mg/L	0 ppt	🟠 Hard	mixed
Sioux City, Iowa	≈ 180+ mg/L	464.9 ppt	🔴 Very Hard	mixed
Vermillion, South Dakota	≈ 180+ mg/L	0 ppt	🔴 Very Hard	groundwater
Fremont, Nebraska	≈ 120–179 mg/L	16.8 ppt	🟠 Hard	groundwater
Yankton, South Dakota	870 mg/L	0 ppt	🔴 Very Hard	groundwater

National Benchmark

How South Sioux City compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ South Sioux City	≈ 120–179 mg/L	🟠 Moderate
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes South Sioux City's Water Unique?

Local geology and source profile

Source: MixedTDS: 528 mg/LpH: 7

South Sioux City Utilities supplies drinking water to about 13,000 residents in Dakota County, Nebraska, and nearby areas close to the Nebraska-Iowa border. The main supply comes from the Missouri River, with groundwater from local wells providing a backup. The city's Water Treatment Plant uses standard methods like filtration and disinfection, along with softening, to make sure the water is safe and meets all regulations.

The Missouri River flows through areas rich in Cretaceous and Tertiary sedimentary rocks, including the Pierre Shale and Ogallala Formation. These rock layers, along with limestone and dolomite, dissolve minerals into the river. The groundwater wells tap into the Dakota Group sands within the High Plains Aquifer system, which also interacts with limestone bedrock. This geological makeup naturally results in water that's hard, meaning it contains higher levels of calcium and magnesium.

Homeowners in South Sioux City often deal with scale buildup in their pipes, water heaters, and dishwashers because of the hard water. This buildup can make appliances less efficient and shorten their lifespan, with some studies showing energy costs can rise by as much as 30%. You might notice deposits on faucets or inside coffee makers. Regularly cleaning with vinegar or installing a water softener can help protect your plumbing and improve appliance. While the water meets EPA standards, the Consumer Confidence Reports offer detailed contaminant information.

Geology & Source: Missouri River watershed and Great Plains aquifers; Cretaceous and Tertiary sedimentary formations, Pierre Shale, Ogallala Formation, Dakota Sandstone aquifer; limestone and dolomite dissolution cause moderate to high hardness.

Other Nebraska Water Reports

Sioux City

≈ 180+ mg/L

🔴 Very Hard

Vermillion

≈ 180+ mg/L

🔴 Very Hard

Fremont

≈ 120–179 mg/L

🟠 Hard

Yankton

870 mg/L

🔴 Very Hard

Report an Issue

Notice an error or missing data? Help us keep this page accurate. If you spot incorrect water hardness, outdated utility info, or missing details, please let us know.

All reports are reviewed by our team. Thank you for supporting data quality!

Frequently Asked Questions

Is South Sioux City's water safe to drink?

Yes. South Sioux City's water meets all federal safety standards. The hardness is ≈ 120–179 mg/L (Hard), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in South Sioux City?

At ≈ 120–179 mg/L (Hard), South Sioux City's water will cause significant limescale on kettles, washing machines, and water heaters. A water softener or descaler is strongly recommended to extend appliance lifespan and reduce energy bills by up to 20%.

How does South Sioux City compare to the USA average?

The USA national average is 151 mg/L. South Sioux City (≈ 120–179 mg/L) is 1 mg/L below the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for South Sioux City is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.

Estimated

Water Hardness

Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.

Estimated

Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.

Estimated

TDS — Total Dissolved Solids

Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.

Measured

PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances

EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.

Modelled

Lead

Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.

Calculated

Appliance Lifespan

Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.