B63/100
NORTH SIOUX CITY — Water Quality Report 2026
Serving 3,042 people · South Dakota
Water Source
Groundwater
County
—
System ID
SD4600226
Violations
34
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.004 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2008.
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
Frequently Asked Questions About NORTH SIOUX CITY
Is NORTH SIOUX CITY water safe to drink?
NORTH SIOUX CITY water receives a grade of B (63/100), which is considered good. Out of 1 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has NORTH SIOUX CITY detected?
1 contaminants were tested in NORTH SIOUX CITY's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does NORTH SIOUX CITY have any EPA violations?
Yes, NORTH SIOUX CITY has 34 EPA violation(s) on record, with the most recent in 2008. Violation types include MR, Other.
How many people does NORTH SIOUX CITY serve?
NORTH SIOUX CITY serves approximately 3,042 people, South Dakota. The system provides water to 1 community: North Sioux City.
What type of water does NORTH SIOUX CITY provide?
NORTH SIOUX CITY sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is SD4600226.
How does NORTH SIOUX CITY compare to other utilities in South Dakota?
NORTH SIOUX CITY scores 63/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our South Dakota state page for a full comparison of water systems.