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Water system · PWSID AZ0410140

MT LEMMON DWID

TUCSON, AZ · ~290 people served

Check your exact address → TUCSON overview
100
Excellent
PurityRadar safety score

PWSID

AZ0410140

State

Arizona

City

TUCSON

Population served

290

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

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

218

Violations on record

1

Unaddressed

0

Health-based

82

Enforcement actions

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

Reporting · EPA contaminant 5200 began Jul 2025 Unaddressed
Other · EPA contaminant 7500 began Mar 2024 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2024 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2024 Resolved
Monitoring · Lead & Copper Rule began Feb 2023 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2023 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2023 Resolved
Monitoring & reporting · Lead & Copper Rule began Jan 2023 Resolved
Reporting · Lead & Copper Rule began May 2022 Resolved
Other · EPA contaminant 7000 began Jul 2021 Resolved
Monitoring & reporting · Lead & Copper Rule began Oct 2020 Resolved
Monitoring & reporting · Lead & Copper Rule began Nov 2017 Resolved

Recent enforcement actions

  • State action · SOX Nov 2025
  • State action · SIF Jun 2025
  • State action · SIF Mar 2025
  • State action · SIE Jan 2025
  • State action · SIA Jan 2025
  • State action · SIF Apr 2024
  • State action · SIA Apr 2024
  • State action · SIE Feb 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

Arsenic

3 stations · latest Oct 2025

0.00031 · max 0.00032 mg/L · 7

Copper

3 stations · latest Oct 2025

0.0053 · max 0.012 mg/L · 7

Manganese

3 stations · latest Oct 2025

0.012 · max 0.022 mg/L · 7

Lead

1 station · latest Oct 2025

0.00034 · max 0.00037 mg/L · 3

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 AZ0410140 — 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.