A86/100
SIOUX FALLS — Water Quality Report 2026
Serving 216,462 people · South Dakota
Water Source
Surface Water
County
—
System ID
SD4600294
Violations
4
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
chlorate | 230.00 µg/L | — | Above Goal |
Lead (90th percentile) | 0.003 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2009.
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 SIOUX FALLS
Is SIOUX FALLS water safe to drink?
SIOUX FALLS water receives a grade of A (86/100), which is considered excellent. Out of 76 contaminants tested, none exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has SIOUX FALLS detected?
76 contaminants were tested in SIOUX FALLS's water. Notable contaminants include Lead (90th percentile), chlorate. No contaminants exceed EPA legal limits. 2 exceed EPA health goals (MCLGs).
Does SIOUX FALLS have any EPA violations?
Yes, SIOUX FALLS has 4 EPA violation(s) on record, with the most recent in 2009. Violation types include TT, MR. 1 are health-based violations.
How many people does SIOUX FALLS serve?
SIOUX FALLS serves approximately 216,462 people, South Dakota. The system provides water to 1 community: Sioux Falls.
What type of water does SIOUX FALLS provide?
SIOUX FALLS sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is SD4600294.
How does SIOUX FALLS compare to other utilities in South Dakota?
SIOUX FALLS scores 86/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our South Dakota state page for a full comparison of water systems.