Home/ Directory/ WY/ YNP-OLD FAITHFUL

Water system · PWSID WY5680085

YNP-OLD FAITHFUL

YELLOWSTONE, WY · ~7,675 people served

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

PWSID

WY5680085

State

Wyoming

City

YELLOWSTONE

Population served

7,675

Primary source

Surface water

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 Nov 2023). Levels in parts per trillion (ppt).

Lithium

74,800 ppt

limit —

No federal limit

Violations & enforcement

19

Violations on record

0

Unaddressed

11

Health-based

26

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement May 2025. Official EPA record →

Treatment technique · Lead & Copper Rule health-based began Jul 2024 Resolved
Monitoring & reporting · Lead & Copper Rule began Jul 2024 Resolved
Treatment technique · Lead & Copper Rule health-based began Jun 2024 Resolved
Treatment technique · Lead & Copper Rule health-based began Mar 2024 Resolved
Monitoring & reporting · Lead & Copper Rule began Dec 2023 Resolved
Treatment technique · Lead & Copper Rule health-based began Nov 2023 Resolved
Monitoring & reporting · Lead & Copper Rule began Oct 2023 Resolved
Max contaminant level (MCL) · Arsenic health-based began Oct 2023 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Jul 2023 Resolved
Max contaminant level (MCL) · Arsenic health-based began Jul 2023 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Jul 2023 Resolved
Max contaminant level (MCL) · Arsenic health-based began Apr 2023 Resolved

Recent enforcement actions

  • State action · SOX May 2025
  • State action · SOX May 2025
  • State action · SOX May 2025
  • State action · SOX Mar 2025
  • State action · SOX Mar 2025
  • State action · SOX Mar 2025
  • State action · SOX Mar 2025
  • State action · SOX Mar 2025

This profile is built from EPA public records for system WY5680085 — 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.