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Water system · PWSID AZ0407092

GILBERT, TOWN OF

GILBERT, AZ · ~247,600 people served

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PurityRadar safety score

PWSID

AZ0407092

State

Arizona

City

GILBERT

Population served

247,600

Primary source

Surface water

Score history

▼ 57 points — the score moved from 100 to 43 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 43

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 Nov 2024). Levels in parts per trillion (ppt).

PFOS

Perfluorooctanesulfonic acid

9.8 ppt

limit 4 ppt

Above EPA limit · 2.4×

PFOA

Perfluorooctanoic acid

6.5 ppt

limit 4 ppt

Above EPA limit · 1.6×

Lithium

172,000 ppt

limit —

No federal limit

PFBS

13 ppt

limit —

No federal limit

PFPeA

6.2 ppt

limit —

No federal limit

PFBA

5 ppt

limit —

No federal limit

PFHxA

4.4 ppt

limit —

No federal limit

Violations & enforcement

854

Violations on record

Unaddressed

Health-based

302

Enforcement actions

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

Monitoring & reporting · EPA contaminant 0200 began Oct 2025 Resolved

Reporting · Lead & Copper Rule began Jul 2025 Resolved

Monitoring & reporting · Nitrate began Apr 2025 Resolved

Monitoring & reporting · EPA contaminant 0200 began Feb 2025 Resolved

Monitoring & reporting · EPA contaminant 0300 began Nov 2024 Resolved

Monitoring & reporting · EPA contaminant 0200 began Nov 2024 Resolved

Monitoring & reporting · Bromate began Oct 2024 Resolved

Monitoring & reporting · Nitrate began Oct 2024 Resolved

Monitoring & reporting · Arsenic began Oct 2024 Resolved

Monitoring & reporting · Nitrate began Oct 2024 Resolved

Recent enforcement actions

State action · SOX Dec 2025
State action · SIA Dec 2025
State action · SIA Aug 2025
State action · SOX Aug 2025
State action · SIA Aug 2025
State action · SOX Aug 2025
State action · SOX Jun 2025
State action · SIA Mar 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

Fluoride

3 stations · latest May 2022

0.27 · max 0.29 mg/L · 5

Arsenic

3 stations · latest May 2022

2.3 · max 2.8 ug/L · 3

Copper

3 stations · latest May 2022

3.8 · max 4.6 ug/L · 3

Nitrate

3 stations · latest May 2022

8.4 · max 17 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 AZ0407092 — 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.