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Water system · PWSID MO4010402

MO AMERICAN IRONTON

CHESTERFIELD, MO · ~1,460 people served

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

PWSID

MO4010402

State

Missouri

City

CHESTERFIELD

Population served

1,460

Primary source

Surface water

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

9

Violations on record

0

Unaddressed

9

Health-based

34

Enforcement actions

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

Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jul 2024 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Apr 2024 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jan 2024 Resolved
Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Jan 2024 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Oct 2023 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jul 2022 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Apr 2022 Resolved
Treatment technique · EPA contaminant 0400 health-based began Feb 2022 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Apr 2016 Resolved

Recent enforcement actions

  • State action · SOX Jan 2025
  • State action · SIF Oct 2024
  • State action · SIF Oct 2024
  • State action · SFJ Oct 2024
  • State action · SIE Oct 2024
  • State action · SFJ Sep 2024
  • State action · SIE Sep 2024
  • State action · SIF Apr 2024

This profile is built from EPA public records for system MO4010402 — 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.