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Water system · PWSID NN0403000

Fort Defiance-Window Rock-St Michaels NTUA

Ft Defiance, AZ · ~12,869 people served

Check your exact address → Ft Defiance overview
100
Excellent
PurityRadar safety score

PWSID

NN0403000

State

Arizona

City

Ft Defiance

Population served

12,869

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 Aug 2025). Levels in parts per trillion (ppt).

Lithium

124,000 ppt

limit —

No federal limit

Violations & enforcement

154

Violations on record

2

Unaddressed

20

Health-based

246

Enforcement actions

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

Treatment technique · Lead & Copper Rule health-based began Feb 2025 Unaddressed
Other · EPA contaminant 7500 began Feb 2025 Unaddressed
Monitoring & reporting · Haloacetic acids (HAA5) began Jul 2018 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Jul 2018 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Apr 2018 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Apr 2018 Resolved
Monitoring & reporting · Nitrite began Jan 2018 Resolved
Monitoring & reporting · Nitrate began Jan 2018 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jan 2017 Resolved
Other · EPA contaminant 7500 began Jan 2017 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Oct 2016 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jul 2016 Resolved

Recent enforcement actions

  • State action · SFJ Dec 2025
  • State action · SOX Sep 2025
  • State action · SFJ Jun 2025
  • State action · SFJ Jun 2025
  • State action · SFJ Apr 2025
  • State action · SFJ Apr 2025
  • State action · SFJ Aug 2024
  • State action · SOX Feb 2019

This profile is built from EPA public records for system NN0403000 — 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.