Skip to main content
WaterSafeCheck

Yankton, SD Tap Water Quality

Water safety reports for all 1 ZIP code in Yankton, South Dakota

Average Score

64/100

Health Violations

1

ZIP Codes

1

High Lead Risk

0

of 1 ZIP codes

C

About Tap Water in Yankton, SD

Water quality in Yankton, SD is currently rated with a moderate C grade (average score: 64/100 across 1 ZIP code). This rating indicates that while the water provided by Yankton is treated and regulated, there have been notable compliance issues or contaminant detections recently. Residents should stay informed about the specific challenges affecting their local supply.

Over the past 5 years, Yankton has recorded 1 health-based violation. While occasional violations can occur due to seasonal changes or temporary infrastructure issues, Yankton is legally required to resolve these quickly and notify the public via their annual Consumer Confidence Report. The city's water supply, primarily drawn from ground water, is treated to address these specific contaminants.

Fortunately, the modeled risk for widespread lead exposure in Yankton's municipal water is relatively low compared to national averages. However, because lead typically enters drinking water through the corrosion of older, individual home plumbing rather than the main supply lines, residents in homes built before 1986 should still exercise caution by running the tap before use.

Health-Based Contaminant Violations in Yankton

EPA records indicate that the following contaminants have exceeded Safe Drinking Water Act Maximum Contaminant Levels (MCLs) in Yankton water systems over the past 5 years.

Chlorine residual

Note: The presence of a past violation does not necessarily mean current water is unsafe. Utilities are required to take corrective action. Review your Consumer Confidence Report for the latest status.

Water Quality by ZIP Code — Yankton, SD

Click any ZIP code for the full water quality report

C
57078

Yankton, SD

Score: 64/1001 violation

Frequently Asked Questions — Yankton Water Quality

Is tap water safe to drink in Yankton, SD?+
Tap water in Yankton has a grade of C, indicating compliance concerns in recent years. Families with young children or pregnant women should consider using a certified NSF/ANSI 53 water filter for drinking and cooking.
What is the water quality score for Yankton?+
The average water quality score across 1 ZIP code in Yankton, SD is 64/100. Scores are derived from EPA violation history, lead levels, enforcement actions, and infrastructure risk indicators. Individual ZIP codes may vary — search your specific ZIP above for a personalized report.
Does Yankton have lead in its tap water?+
Lead risk ratings in Yankton are relatively low based on EPA monitoring data. However, lead in home plumbing is a separate concern — if your home was built before 1986, individual tap testing is recommended.
How do I get the water quality report for Yankton?+
Each ZIP code in Yankton has a full water quality report on this site — click any ZIP code below. You can also get the annual Consumer Confidence Report (CCR) from your local water utility. The CCR is required to be published every year by July 1 and contains actual contaminant measurements and violation history.
Where does Yankton's tap water come from?+
Tap water in Yankton, SD primarily comes from ground water. Groundwater systems pump water from underground aquifers, which is naturally filtered through soil and rock but can still contain naturally occurring contaminants.

Looking for water quality in other cities in South Dakota?

View All Cities in South Dakota →