City overview · Saint Louis City County

PFAS in Saint Louis, MO

Low Level

EPA UCMR 5 tested 4 public water systems serving the Saint Louis area across 47 ZIP codes. Only trace PFAS were detected across Saint Louis's tested systems.

Water systems tested

Systems above EPA limits

ZIP codes covered

County

Saint Louis City County, Missouri

Plain English

01What this means for Saint Louis

The water systems serving the Saint Louis area measured only low, trace concentrations of PFAS — well below the EPA's Maximum Contaminant Levels. For most residents this represents minimal risk from drinking water. Review your specific ZIP below, and check your utility's annual Consumer Confidence Report for year-over-year trends.

By utility

02Water systems serving Saint Louis

By ZIP code

03Find your exact result

Contamination can differ block to block. Select your ZIP code for the precise reading at the utility that serves your address.

Source & Methodology

About this data

Source

EPA UCMR 5

Sampling period

January 2023 – December 2025

Aggregation

4 utilities across 47 ZIP codes

Detection threshold (MRL)

~1.5–2 ppt

City-level figures aggregate the individual public water systems tested under EPA UCMR 5 whose service area falls within the Saint Louis area. Values reflect water quality at the treatment plant; your home's plumbing can affect what reaches your tap. Select your ZIP above for the utility-specific reading.