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Water system · PWSID IL0311770

MARKHAM

MARKHAM, IL · ~12,500 people served

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

PWSID

IL0311770

State

Illinois

City

MARKHAM

Population served

12,500

Primary source

SWP

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

PFHxA

3 ppt

limit —

No federal limit

Violations & enforcement

24

Violations on record

2

Unaddressed

3

Health-based

91

Enforcement actions

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

Reporting · EPA contaminant 5200 began Jul 2025 Unaddressed
Other · EPA contaminant 7000 began Jul 2025 Unaddressed
Monitoring & reporting · Total trihalomethanes (TTHM) began Jul 2025 Resolved
Other · EPA contaminant 7000 began Jul 2023 Resolved
Other · EPA contaminant 7500 began Jun 2023 Resolved
Other · EPA contaminant 7500 began Jun 2023 Resolved
Monitoring · Lead & Copper Rule began May 2022 Resolved
Monitoring & reporting · EPA contaminant 0999 began Apr 2022 Resolved
Monitoring & reporting · Lead & Copper Rule began Dec 2020 Resolved
Max contaminant level (MCL) · Total coliform health-based began Aug 2013 Resolved
Monitoring & reporting · EPA contaminant 0999 began Jul 2013 Resolved
Other · EPA contaminant 7000 began Jul 2011 Resolved

Recent enforcement actions

  • State action · SOX Oct 2025
  • State action · SIE Oct 2025
  • State action · SIA Oct 2025
  • State action · SIA Aug 2025
  • State action · SIA Jul 2025
  • State action · SIE Jul 2025
  • State action · SIF Jun 2024
  • State action · SIF Jun 2024

This profile is built from EPA public records for system IL0311770 — 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.