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Water system · PWSID SD4600423

YANKTON

YANKTON, SD · ~15,411 people served

Check your exact address → YANKTON overview
100
Excellent
PurityRadar safety score

PWSID

SD4600423

State

South Dakota

City

YANKTON

Population served

15,411

Primary source

Groundwater

Score history

No change since tracking began Jun 18, 2026.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 100

2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.

PFAS & contaminant readings

Latest detections from EPA’s UCMR5 monitoring (through Jan 2024). Levels in parts per trillion (ppt).

Lithium

69,000 ppt

limit —

No federal limit

Violations & enforcement

30

Violations on record

0

Unaddressed

20

Health-based

88

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jun 2020. Official EPA record →

Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jan 2020 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Oct 2019 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jul 2019 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Apr 2019 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Apr 2016 Resolved
Treatment technique · EPA contaminant 0400 health-based began Feb 2011 Resolved
Treatment technique · EPA contaminant 0400 health-based began Feb 2010 Resolved
Monitoring & reporting · EPA contaminant 0600 began Jan 2010 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jan 2009 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Oct 2008 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jul 2008 Resolved
Monitoring & reporting · EPA contaminant 2041 began Apr 2008 Resolved

Recent enforcement actions

  • State action · SOX Jun 2020
  • State action · SOX Jun 2020
  • State action · SOX Jun 2020
  • State action · SOX Jun 2020
  • State action · SIF May 2020
  • State action · SIE Apr 2020
  • State action · SIF Jan 2020
  • State action · SIE Jan 2020

This profile is built from EPA public records for system SD4600423 — SDWIS violations and UCMR5 PFAS sampling. The score is system-level and can’t account for your home’s plumbing (older pipes can add lead at the tap). For health decisions, check your exact address, read the utility’s Consumer Confidence Report, and confirm with your provider.