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Water system · PWSID 090400051

Colorado River Regional Water System

Parker, AZ · ~8,490 people served

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

PWSID

090400051

State

Arizona

City

Parker

Population served

8,490

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

150,000 ppt

limit —

No federal limit

Violations & enforcement

52

Violations on record

0

Unaddressed

17

Health-based

132

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jan 2026. Official EPA record →

Reporting · Lead & Copper Rule began Mar 2025 Resolved
Monitoring & reporting · Lead & Copper Rule began Oct 2023 Resolved
Monitoring & reporting · Nitrate began Jan 2021 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2021 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2021 Resolved
Treatment technique · Lead & Copper Rule health-based began Apr 2020 Resolved
Monitoring & reporting · Nitrate began Jan 2017 Resolved
Max contaminant level (MCL) · Lead & Copper Rule health-based began Sep 2016 Resolved
Monitoring · Lead & Copper Rule began Jun 2016 Resolved
Monitoring & reporting · Nitrate began Jan 2016 Resolved
Max contaminant level (MCL) · Total coliform health-based began Oct 2015 Resolved
Other · EPA contaminant 7500 began Oct 2015 Resolved

Recent enforcement actions

  • EPA/federal action · EOX Jan 2026
  • EPA/federal action · EIA Jun 2025
  • EPA/federal action · EIA Jun 2025
  • EPA/federal action · EOX Apr 2025
  • EPA/federal action · EOX Mar 2024
  • EPA/federal action · EOX Dec 2022
  • EPA/federal action · EOX Aug 2022
  • EPA/federal action · EOX Jun 2020

This profile is built from EPA public records for system 090400051 — 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.