Navajo Mountain Community Boarding School BIA

Tonalea, AZ · ~163 people served

Check your exact address → Tonalea overview

100

Excellent

PurityRadar safety score

PWSID

NN4933011

State

Arizona

City

Tonalea

Population served

163

Primary source

GWP

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

Violations on record

Unaddressed

Health-based

Enforcement actions

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

Other · EPA contaminant 7000 began Jul 2024 Resolved

Monitoring · Lead & Copper Rule began Mar 2024 Resolved

Monitoring · Lead & Copper Rule began Feb 2024 Resolved

Monitoring · Lead & Copper Rule began Jan 2024 Resolved

Reporting · Lead & Copper Rule began Oct 2023 Resolved

Reporting · Lead & Copper Rule began Oct 2022 Resolved

Reporting · Lead & Copper Rule began Dec 2020 Resolved

Reporting · Lead & Copper Rule began May 2020 Resolved

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

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

Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2018 Resolved

Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2018 Resolved

Recent enforcement actions

State action · SOX Jul 2025
State action · SFJ Mar 2025
State action · SOX Apr 2024
State action · SOX Apr 2024
State action · SOX Apr 2024
State action · SOX Nov 2023
State action · SOX Nov 2022
State action · SOX Jul 2021

This profile is built from EPA public records for system NN4933011 — 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.