Mariano Lake-Pinedale-Church Rock NTUA

Ft Defiance, AZ · ~4,562 people served

Check your exact address → Ft Defiance overview

100

Excellent

PurityRadar safety score

PWSID

NN3500211

State

Arizona

City

Ft Defiance

Population served

4,562

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

Lithium

32,000 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

107

Enforcement actions

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

Other · Lead & Copper Rule began Apr 2016 Unaddressed

Monitoring & reporting · Fluoride began Jan 2021 Resolved

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

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

Monitoring & reporting · Fluoride 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 · Lead & Copper Rule began Jan 2017 Resolved

Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2014 Resolved

Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2014 Resolved

Monitoring & reporting · EPA contaminant 2034 began Jul 2013 Resolved

Recent enforcement actions

State action · SFJ Apr 2025
State action · SFJ Apr 2025
State action · SFJ Aug 2024
State action · SOX Feb 2022
State action · SOX Feb 2022
State action · SOX Jul 2021
State action · SOX Jul 2021
State action · SFG Mar 2021

This profile is built from EPA public records for system NN3500211 — 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.