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Water system · PWSID NN0400322

Shonto NTUA

Ft Defiance, AZ · ~397 people served

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

PWSID

NN0400322

State

Arizona

City

Ft Defiance

Population served

397

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

No PFAS detections are on record for this system from EPA’s UCMR5 monitoring (2023–25). Absence of a detection isn’t a guarantee — not every system was sampled, and this dataset doesn’t cover other contaminants.

Violations & enforcement

28

Violations on record

2

Unaddressed

0

Health-based

35

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Aug 2024. Official EPA record →

Other · Lead & Copper Rule began Apr 2016 Unaddressed
Monitoring & reporting · EPA contaminant 0600 began Oct 2013 Unaddressed
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 · EPA contaminant 2968 began Jan 2005 Resolved
Monitoring & reporting · EPA contaminant 2964 began Jan 2005 Resolved
Monitoring & reporting · EPA contaminant 2378 began Jan 2005 Resolved
Monitoring & reporting · EPA contaminant 2979 began Jan 2005 Resolved
Monitoring & reporting · EPA contaminant 2977 began Jan 2005 Resolved
Monitoring & reporting · EPA contaminant 2980 began Jan 2005 Resolved
Monitoring & reporting · EPA contaminant 2955 began Jan 2005 Resolved

Recent enforcement actions

  • State action · SFJ Aug 2024
  • State action · SOX Apr 2021
  • State action · SFJ Mar 2021
  • State action · SFG Mar 2021
  • State action · SFJ Aug 2017
  • State action · SFG Aug 2017
  • State action · SFJ Jan 2013
  • State action · SOX Jan 2013

This profile is built from EPA public records for system NN0400322 — 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.