A84/100
South Sioux City Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 14,043 residents · Nebraska
What's In South Sioux City's Tap Water?
70
Contaminants Tested
1
Exceed EPA Limits
1
Above EPA Goals
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.80 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2000.
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Water Utility Details
SOUTH SIOUX CITY, CITY OF
Population Served
14,043
Water Source
GUP
System ID
NE3104309
Frequently Asked Questions About South Sioux City Water
Is South Sioux City tap water safe to drink?
South Sioux City, Nebraska tap water receives a grade of A (84/100), which is considered excellent. Out of 70 contaminants tested, 1 exceed EPA maximum contaminant levels (MCLs) and 2 exceed health guidelines (MCLGs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.
What contaminants are in South Sioux City's water?
Of the 70 contaminants tested in South Sioux City's water supply, the most notable include Copper (90th percentile), Lead (90th percentile). 1 contaminant(s) exceed EPA legal limits (MCLs). 2 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does South Sioux City have any water quality violations?
Yes, South Sioux City has 1 EPA violation(s) on record, with the most recent in 2000. Violation types include MCL. 1 of these are health-based violations, which are the most serious category.
Do I need a water filter in South Sioux City?
Based on EPA data, using a water filter in South Sioux City is recommended. 1 contaminant(s) exceed legal limits. An NSF-certified filter — such as a reverse osmosis or activated carbon system — can effectively reduce many common contaminants. Choose a filter certified to remove the specific contaminants found in your area.
Where does South Sioux City's tap water come from?
South Sioux City's drinking water is sourced from gup and supplied by SOUTH SIOUX CITY, CITY OF. The system serves approximately 14,043 people.
How often is South Sioux City's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. South Sioux City's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does South Sioux City's water compare to other cities in Nebraska?
South Sioux City's water quality score of 84/100 earns a grade of A, which is considered excellent. This places South Sioux City among the better-performing water systems in Nebraska. Visit our Nebraska state page to see how all cities in the state compare.
What should I do if I'm concerned about South Sioux City's water quality?
If you have concerns about South Sioux City's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (SOUTH SIOUX CITY, CITY OF) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.