Chinle-Many Farms-Del Muerto NTUA

Ft Defiance, AZ · ~8,458 people served

Check your exact address → Ft Defiance overview

100

Excellent

PurityRadar safety score

PWSID

NN0400174

State

Arizona

City

Ft Defiance

Population served

8,458

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

Lithium

37,800 ppt

limit —

No federal limit

Violations & enforcement

149

Violations on record

Unaddressed

Health-based

292

Enforcement actions

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

Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2021 Resolved

Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2021 Resolved

Monitoring & reporting · Cadmium began Jan 2020 Resolved

Monitoring & reporting · EPA contaminant 1075 began Jan 2020 Resolved

Monitoring · Lead & Copper Rule began Apr 2017 Resolved

Monitoring · Lead & Copper Rule began Mar 2017 Resolved

Monitoring · Lead & Copper Rule began Feb 2017 Resolved

Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2017 Resolved

Monitoring · Lead & Copper Rule began Jan 2017 Resolved

Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2017 Resolved

Max contaminant level (MCL) · Total coliform health-based began Aug 2014 Resolved

Monitoring & reporting · Total coliform began Dec 2012 Resolved

Recent enforcement actions

State action · SOX Aug 2022
State action · SOX Aug 2022
State action · SFJ Mar 2022
State action · SFJ Mar 2022
State action · SFG Mar 2022
State action · SFG Mar 2022
State action · SFG Aug 2020
State action · SFJ Aug 2020

This profile is built from EPA public records for system NN0400174 — 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.