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Water system · PWSID AZ0412004

NOGALES CITY OF

NOGALES, AZ · ~22,000 people served

Check your exact address → NOGALES overview
85
Excellent
PurityRadar safety score

PWSID

AZ0412004

State

Arizona

City

NOGALES

Population served

22,000

Primary source

Groundwater

Score history

No change since tracking began Jun 18, 2026.

Jun 18, 2026 · score 85 Jun 18, 2026 · score 85

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

39,700 ppt

limit —

No federal limit

Violations & enforcement

1,216

Violations on record

0

Unaddressed

23

Health-based

503

Enforcement actions

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

Other · EPA contaminant 7500 began Dec 2024 Resolved
Reporting · EPA contaminant 5200 began Oct 2024 Addressed
Treatment technique · EPA contaminant 5200 health-based began Oct 2024 Addressed
Monitoring & reporting · Total trihalomethanes (TTHM) began Oct 2024 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Oct 2024 Resolved
Monitoring & reporting · Arsenic began Oct 2024 Resolved
Other · EPA contaminant 7500 began Apr 2024 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Oct 2023 Resolved
Monitoring & reporting · Arsenic began Oct 2023 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Oct 2023 Resolved
Monitoring & reporting · Arsenic began Jul 2023 Resolved
Reporting · Lead & Copper Rule began Jul 2023 Resolved

Recent enforcement actions

  • EPA/federal action · EFL Oct 2025
  • State action · SIF Jul 2025
  • State action · SOX Feb 2025
  • State action · SIF Feb 2025
  • State action · SIF Feb 2025
  • State action · SOX Feb 2025
  • State action · SIA Jan 2025
  • State action · SIA Jan 2025

Area water-quality monitoring

Environmental monitoring (rivers, wells, intakes) recorded in this system’s service area in the EPA/USGS Water Quality Portal since 2018 — source/ambient water, not finished tap water. Context for the watershed, not a reading from your tap.

ContaminantMedian · max · samples

Copper

1 station · latest Apr 2025

0.0026 · max 0.051 mg/L · 7

Arsenic

1 station · latest Apr 2025

0.00465 · max 0.0095 mg/L · 6

Manganese

1 station · latest Apr 2025

0.36 · max 0.39 mg/L · 6

Lead

1 station · latest Apr 2025

0.0074 · max 0.03 mg/L · 3

Fluoride

1 station · latest Apr 2025

0.5 · max 0.5 mg/L · 1

Source: Water Quality Portal (EPA/USGS/state agencies). Values are as-reported and aren’t health thresholds.

This profile is built from EPA public records for system AZ0412004 — 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.