What's in YANKTON's water?
YANKTON has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. It serves 15,411 people through 5,500 service connections.
Ranked against every other system in this dataset
YANKTON has 33 violations on record in total, 20 of thems health-based - ranking it 895th of 12,903 systems by violation count, the 93th percentile nationally.
Against the SD average
SD's 74 covered systems average 3.0 health-based violations each; YANKTON carries 20, more than typical for the state. See the lead and copper guide for why lead counts differently.
Most recent violation on record
YANKTON's most recent violation on record is dated 2020-01-01, with the most recent health-based one dated 2020-01-01. Last reported to EPA: 06/17/2026.
The concern categories on record
YANKTON's flagged contaminants and rule violations, grouped by what they actually mean for a filter choice rather than left as EPA's raw code list:
- Microbial contamination / treatment technique - flagged from: Stage 1 Disinfectants and Disinfection Byproducts Rule; Surface Water Treatment Rule
- Synthetic organic chemicals / pesticides / VOCs - flagged from: Pentachlorophenol
- Disinfection byproducts - flagged from: TTHM
The most severe category on record is microbial contamination / treatment technique, which points toward a microbial-class filter if you want to address it directly.
What YANKTON's record does not cover
This is what YANKTON reported to its state primacy agency and EPA under the Safe Drinking Water Act - real regulatory record, not a lab test of your specific tap. This record - 20 health-based violations on file for YANKTON - stops at the meter and cannot see household plumbing on the other side of it. The guide to what this data misses covers that gap.