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Water system · PWSID NN0400206

Tuba City NTUA

Fort Defiance, AZ · ~6,276 people served

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

PWSID

NN0400206

State

Arizona

City

Fort Defiance

Population served

6,276

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

Lithium

12,000 ppt

limit —

No federal limit

Violations & enforcement

56

Violations on record

0

Unaddressed

3

Health-based

58

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement May 2022. Official EPA record →

Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2020 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2020 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2015 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2015 Resolved
Monitoring & reporting · Total coliform began Apr 2014 Resolved
Monitoring & reporting · Lead & Copper Rule began Jan 2014 Resolved
Monitoring & reporting · Lead & Copper Rule began Jan 2013 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2012 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2012 Resolved
Monitoring & reporting · Total coliform began Dec 2011 Resolved
Monitoring & reporting · Total coliform began Nov 2011 Resolved
Monitoring & reporting · Total coliform began Oct 2011 Resolved

Recent enforcement actions

  • State action · SOX May 2022
  • State action · SFJ Mar 2022
  • State action · SFG Mar 2022
  • State action · SOX Jul 2021
  • State action · SOX Jul 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 NN0400206 — 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.