ST LOUIS CITY PWS

ST LOUIS, MO · ~304,709 people served

Check your exact address → ST LOUIS overview

100

Excellent

PurityRadar safety score

PWSID

MO6010715

State

Missouri

City

ST LOUIS

Population served

304,709

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

Latest detections from EPA’s UCMR5 monitoring (through Dec 2024). Levels in parts per trillion (ppt).

Lithium

36,300 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement May 2024. Official EPA record →

Monitoring & reporting · Lead & Copper Rule began Dec 2025 Unaddressed

Monitoring & reporting · EPA contaminant 2050 began Oct 2022 Resolved

Monitoring & reporting · EPA contaminant 2051 began Oct 2022 Resolved

Monitoring & reporting · EPA contaminant 2037 began Oct 2022 Resolved

Monitoring & reporting · EPA contaminant 2037 began Jul 2022 Resolved

Monitoring & reporting · EPA contaminant 2050 began Jul 2022 Resolved

Monitoring & reporting · EPA contaminant 2051 began Jul 2022 Resolved

Recent enforcement actions

State action · SOX May 2024
State action · SIF Mar 2023
State action · SIF Mar 2023
State action · SIA Feb 2023
State action · SIA Feb 2023
State action · SIE Feb 2023
State action · SIE Feb 2023
State action · SIA Nov 2019

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

2 stations · latest Sep 2024

0.0775 · max 0.659 mg/L · 37

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 MO6010715 — 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.