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Water system · PWSID AZ0411128

EPCOR - SAN TAN

SAN TAN VALLEY, AZ · ~87,435 people served

Check your exact address → SAN TAN VALLEY overview
100
Excellent
PurityRadar safety score

PWSID

AZ0411128

State

Arizona

City

SAN TAN VALLEY

Population served

87,435

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

Lithium

133,000 ppt

limit —

No federal limit

Violations & enforcement

267

Violations on record

0

Unaddressed

7

Health-based

140

Enforcement actions

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

Monitoring & reporting · EPA contaminant 0999 began Dec 2024 Resolved
Monitoring & reporting · EPA contaminant 0999 began Sep 2024 Resolved
Monitoring & reporting · EPA contaminant 0999 began Apr 2024 Resolved
Monitoring & reporting · EPA contaminant 2969 began Jan 2024 Resolved
Monitoring & reporting · EPA contaminant 2380 began Jan 2024 Resolved
Monitoring & reporting · EPA contaminant 2968 began Jan 2024 Resolved
Monitoring & reporting · EPA contaminant 2955 began Jan 2024 Resolved
Monitoring & reporting · Nitrate began Jan 2024 Resolved
Monitoring & reporting · Nitrate began Jan 2024 Resolved
Monitoring & reporting · EPA contaminant 2378 began Jan 2024 Resolved
Monitoring & reporting · EPA contaminant 2964 began Jan 2024 Resolved
Monitoring & reporting · EPA contaminant 2977 began Jan 2024 Resolved

Recent enforcement actions

  • State action · SIF Sep 2025
  • State action · SOX Feb 2025
  • State action · SOX Feb 2025
  • State action · SOX Feb 2025
  • State action · SOX Feb 2025
  • State action · SOX Feb 2025
  • State action · SIA Jan 2025
  • State action · SIA Jan 2025

This profile is built from EPA public records for system AZ0411128 — 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.