City overview · District Of Columbia County

PFAS in Washington, DC

Low Level

EPA UCMR 5 tested 4 public water systems serving the Washington area across 260 ZIP codes. Only trace PFAS were detected across Washington's tested systems.

Water systems tested

Systems above EPA limits

ZIP codes covered

260

County

District Of Columbia County, Washington D.C.

Plain English

01What this means for Washington

The water systems serving the Washington 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 Washington

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.

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Source & Methodology

About this data

Source

EPA UCMR 5

Sampling period

January 2023 – December 2025

Aggregation

4 utilities across 260 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 Washington 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.