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Water system · PWSID MO6024406

MONTGOMERY CO PWSD 1

WARRENTON, MO · ~3,850 people served

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

PWSID

MO6024406

State

Missouri

City

WARRENTON

Population served

3,850

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 Jun 2025). Levels in parts per trillion (ppt).

Lithium

40,900 ppt

limit —

No federal limit

Violations & enforcement

22

Violations on record

2

Unaddressed

1

Health-based

67

Enforcement actions

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

Other · EPA contaminant 7500 began Oct 2024 Unaddressed
Monitoring & reporting · Lead & Copper Rule began Oct 2020 Unaddressed
Reporting · EPA contaminant 5200 began Oct 2024 Resolved
Monitoring & reporting · Lead & Copper Rule began Oct 2024 Resolved
Treatment technique · EPA contaminant 0700 health-based began Aug 2024 Resolved
Monitoring · Lead & Copper Rule began Jun 2023 Resolved
Monitoring · Lead & Copper Rule began Mar 2017 Resolved
Other · EPA contaminant 7500 began Apr 2016 Resolved
Monitoring & reporting · Total coliform began Mar 2015 Resolved
Monitoring & reporting · Total coliform began Jun 2008 Resolved
Monitoring & reporting · Total coliform began May 2008 Resolved
Monitoring & reporting · EPA contaminant 0600 began Apr 2008 Resolved

Recent enforcement actions

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

Nitrate

1 station · latest Aug 2023

0.867 · max 2.42 mg/l as N · 102

Arsenic

1 station · latest Oct 2023

3 · max 5.3 ug/l · 52

Atrazine

1 station · latest Oct 2023

307 · max 2,350 ng/l · 52

Fluoride

1 station · latest Oct 2023

0.305 · max 0.48 mg/l · 52

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 MO6024406 — 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.