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Water system · PWSID AZ0414005

SAN LUIS CITY OF

SAN LUIS, AZ · ~39,705 people served

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

PWSID

AZ0414005

State

Arizona

City

SAN LUIS

Population served

39,705

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

Lithium

63,800 ppt

limit —

No federal limit

Violations & enforcement

577

Violations on record

0

Unaddressed

8

Health-based

298

Enforcement actions

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

Monitoring & reporting · Lead & Copper Rule began Oct 2024 Resolved
Treatment technique · EPA contaminant 0700 health-based began Jun 2024 Resolved
Reporting · Lead & Copper Rule began Feb 2024 Resolved
Monitoring & reporting · Lead & Copper Rule began Sep 2021 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Sep 2021 Resolved
Monitoring & reporting · EPA contaminant 3014 began Sep 2021 Resolved
Treatment technique · EPA contaminant 0700 health-based began Aug 2021 Resolved
Other · Lead & Copper Rule began Aug 2021 Resolved
Other · EPA contaminant 7000 began Jul 2019 Resolved
Reporting · Lead & Copper Rule began May 2019 Resolved
Reporting · Lead & Copper Rule began Sep 2017 Resolved
Monitoring & reporting · EPA contaminant 3014 began Feb 2015 Resolved

Recent enforcement actions

  • State action · SIF Jan 2025
  • State action · SIF Jan 2025
  • State action · SIA Dec 2024
  • State action · SOX Dec 2024
  • State action · SIE Dec 2024
  • State action · SIA Dec 2024
  • State action · SIE Dec 2024
  • State action · SOX Nov 2024

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

Nitrate

1 station · latest Aug 2023

0.736 · max 1.8 mg/l as N · 76

Manganese

1 station · latest Nov 2023

153 · max 749 ug/l · 42

Fluoride

1 station · latest Nov 2023

0.33 · max 0.54 mg/l · 41

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 AZ0414005 — 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.