---
title: "What Is VEC (Vapor Encroachment Condition)? | Calibre Glossary"
description: "A vapor encroachment condition is the presence or likely presence of chemical vapors in the subsurface of a property from contaminated soil or groundwater,."
url: https://calibre.multisites.ai/glossary/vapor-encroachment-condition
publisher: Calibre Commercial Inspections
phone: "+1-208-305-6245"
email: Schedule@CalibreCBI.com
---

Environmental

# Vapor Encroachment Condition (VEC)

A vapor encroachment condition is the presence or likely presence of chemical vapors in the subsurface of a property from contaminated soil or groundwater, identified through screening under ASTM E2600.

## Why it matters

Vapors can migrate from nearby dry cleaners, fuel sites and industrial uses. ASTM E2600 gives a two-tier screening method that environmental professionals use alongside a Phase I. A confirmed concern may lead to sampling or vapor mitigation planning.

Source: [store.astm.org](https://store.astm.org/e2600-22.html)

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