F0/100
YANKTON — Water Quality Report 2026
Serving 15,411 people · South Dakota
Water Source
Groundwater
County
—
System ID
SD4600423
Violations
32
Contaminant Test Results
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2020.
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 YANKTON
Is YANKTON water safe to drink?
YANKTON water receives a grade of F (0/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 32 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has YANKTON detected?
69 contaminants were tested in YANKTON's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does YANKTON have any EPA violations?
Yes, YANKTON has 32 EPA violation(s) on record, with the most recent in 2020. Violation types include MCL, TT, MR. 20 are health-based violations.
How many people does YANKTON serve?
YANKTON serves approximately 15,411 people, South Dakota. The system provides water to 1 community: Yankton.
What type of water does YANKTON provide?
YANKTON sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is SD4600423.
How does YANKTON compare to other utilities in South Dakota?
YANKTON scores 0/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our South Dakota state page for a full comparison of water systems.