Water Health Check Report

Herndon, VA

Fairfax County Water Authority · Surface water source

28

Poor

2 above EPA limit
4 above EWG guideline

Score methodology →
EPA · VA6059501UCMR5 PFAS data included1,121,613 people servedLast updated Dec 2024

Poor — with 6 concerns

Fairfax County Water Authority has 2 contaminants above EPA legal limits and 4 above EWG health guidelines. Lead levels within limits at treatment plant

Lead levels within limits at treatment plant

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Contaminants tested

26 total · 4 above EWG guideline
ContaminantLevelStatus
6.2 ppt
Above EPA limit
5.2 ppt
Above EPA limit
14.9 ppt
Above guideline
4.8 ppt
Above guideline
8.2 ppt
Above guideline
7.0 ppt
Above guideline
5.4 ppt
Within limits
9.5 ppt
Within limits
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
Lithium

CAS 7439-93-2

ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
LegendWithin limitsAbove EWG guidelineAbove EPA limitNot detectedSource: EPA SDWIS · UCMR5 · EWG Health Guidelines

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6 contaminants above guidelines. Here's what removes them.

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Data sources

EPA UCMR5 (PFAS + lithium)·December 2024·One-time programme 2023–2025

Status flags compare detected levels against both EPA legal limits and EWG health-based guidelines—which are stricter and science-derived, independent of political feasibility.

Herndon, VA water quality report · WaterHealthCheck