F0/100
Yankton Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 15,411 residents · South Dakota
What's In Yankton's Tap Water?
69
Contaminants Tested
0
Exceed EPA Limits
0
Above EPA Goals
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
Water Utility Details
YANKTON
Population Served
15,411
Water Source
Groundwater
System ID
SD4600423
Frequently Asked Questions About Yankton Water
Is Yankton tap water safe to drink?
Yankton, South Dakota tap water receives a grade of F (0/100), which is considered failing. 0 contaminant(s) exceed EPA maximum contaminant levels and 32 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Yankton's water?
69 contaminants were tested in Yankton's water supply. No contaminants exceed EPA legal limits (MCLs) or health goals (MCLGs), which is a positive indicator of water quality.
Does Yankton have any water quality violations?
Yes, Yankton has 32 EPA violation(s) on record, with the most recent in 2020. Violation types include MCL, TT, MR. 20 of these are health-based violations, which are the most serious category.
Do I need a water filter in Yankton?
Yankton water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. All contaminants are within health goals.
Where does Yankton's tap water come from?
Yankton's drinking water is sourced from groundwater and supplied by YANKTON. The system serves approximately 15,411 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Yankton'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. Yankton'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 Yankton's water compare to other cities in South Dakota?
Yankton's water quality score of 0/100 earns a grade of F, which is considered failing. This is a concerning score that suggests significant water quality issues. Visit our South Dakota state page to see how all cities in the state compare.
What should I do if I'm concerned about Yankton's water quality?
If you have concerns about Yankton'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 (YANKTON) 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.