Pinon-District 4 NTUA

Ft Defiance, AZ · ~5,195 people served

Check your exact address → Ft Defiance overview

100

Excellent

PurityRadar safety score

PWSID

NN0403004

State

Arizona

City

Ft Defiance

Population served

5,195

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

Lithium

74,400 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

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

Monitoring & reporting · EPA contaminant 0600 began Oct 2013 Unaddressed

Monitoring & reporting · EPA contaminant 1075 began Jan 2020 Resolved

Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2020 Resolved

Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2020 Resolved

Monitoring & reporting · Arsenic began Jan 2017 Resolved

Other · Lead & Copper Rule began Apr 2016 Resolved

Monitoring & reporting · Total coliform began Dec 2012 Resolved

Monitoring & reporting · Total coliform began Nov 2012 Resolved

Monitoring & reporting · Nitrite began Jan 2010 Resolved

Monitoring & reporting · Total coliform began Aug 2006 Resolved

Monitoring & reporting · EPA contaminant 2964 began Jan 2005 Resolved

Monitoring & reporting · EPA contaminant 2979 began Jan 2005 Resolved

Recent enforcement actions

State action · SOX Feb 2025
State action · SFJ Aug 2024
State action · SOX Jul 2021
State action · SOX Jul 2021
State action · SFG Mar 2021
State action · SFG Mar 2021
State action · SFG Mar 2021
State action · SFJ Mar 2021

This profile is built from EPA public records for system NN0403004 — 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.