Vapor Intrusion
12 expert articles on vapor intrusion from Envicon Group's NY and NJ environmental engineers.
Vapor Intrusion Assessment NYC: E-Designation, Soil Vapor Testing, and Real Estate Closing Risk
A vapor intrusion assessment can determine whether volatile organic compounds in soil or groundwater are migrating into a building. For New York City property transactions, the assessment can also determine whether an acquisition stays on schedule or moves into a longer regulatory and lender review. The issue often appears during Phase I or Phase II […]
NYSDEC Vapor Intrusion Guidance: 2026 Soil Vapor Sampling and Decision Matrix Updates for NYC Sites
For NYC and Lower Hudson Valley property transactions, vapor intrusion is no longer a late-stage technical issue. It can affect acquisition decisions, lender approval, building design, remediation budgets, and closing schedules. The current NYSDEC vapor intrusion guidance 2026 framework remains anchored in the New York State Department of Health’s 2006 Soil Vapor Intrusion Guidance, with […]
Vapor Intrusion Mitigation Systems in NYC and NJ: Design, Installation, and Long-Term Monitoring
Vapor intrusion mitigation systems protect occupied buildings from volatile organic compounds, or VOCs, migrating from contaminated soil or groundwater into indoor air. In New York City and New Jersey, the right system must do more than reduce vapor concentrations. It must satisfy agency requirements, support the construction schedule, and remain functional after the building opens. […]
Vapor Intrusion Mitigation Cost in NYC & NJ: Sub-Slab Depressurization System Pricing
Published August 12, 2026 · 8-minute read If you’re budgeting a vapor intrusion remedy in New York City or New Jersey, the first number you’ll find online may be misleading. A basic residential radon-style system can cost a few thousand dollars. A regulated vapor intrusion mitigation system for a commercial, multifamily, or mixed-use building can […]
Vapor Intrusion Testing and Screening: NJDEP Levels and NYC OER Requirements
A vapor intrusion investigation answers one practical question: Are volatile chemicals in soil, soil gas, or groundwater entering a building at concentrations that require further action? The answer depends on the jurisdiction, the chemical, the building, and the quality of the sampling data. New Jersey and New York City use related but different frameworks. NJDEP […]
NJDEP Modernizes Remedial Action Permits: Indoor Air Regulation and Consolidated Applications
For years, managing environmental compliance across complex commercial and industrial properties in New Jersey meant juggling a fragmented suite of applications, permits, and schedules. If your site had both soil impacts and a vapor mitigation system, you were managing separate regulatory tracks with different timelines, separate renewal cycles, and administrative overhead that drained valuable resources […]
Vapor Intrusion Assessments for NYC/NJ Real Estate Closings: Environmental Due Diligence Essentials
A commercial real estate closing in Brooklyn, Jersey City, Newark, or anywhere across the New York–New Jersey region can move quickly, until a Phase I ESA identifies a potential vapor concern. Volatile organic compounds, or VOCs, can migrate from contaminated soil or groundwater into buildings through cracks, utility penetrations, sump pits, elevator shafts, and other […]
NJDEP Overhauls Remedial Action Permits: Indoor Air Now a Third Media Component Alongside Soil and Groundwater
The landscape of site remediation in New Jersey just underwent its most significant regulatory modernization in years. As of February 2026, the New Jersey Department of Environmental Protection (NJDEP) has officially restructured the Remedial Action Permit (RAP) program, fundamentally changing how vapor intrusion and indoor air are managed. For years, the industry operated under a […]
Vapor Intrusion: What the 2021 NJDEP Remediation Standards Mean for Your Next Build
If you’re developing in New Jersey, you already know the regulatory landscape is a moving target. But the update that hit in May 2021 wasn’t just a minor adjustment: it was a fundamental shift in how the state handles vapor intrusion (VI). What used to be "guidance" is now codified law. The NJDEP’s 2021 amendments […]
Vapor Intrusion Mitigation: Protecting the Asset, Not Just the Building
If you’re developing in the New York/New Jersey metro area, you already know that what’s under the slab is just as important as what’s going up on top. But for many developers, vapor intrusion mitigation in NYC is treated like a late-stage tax: a regulatory box to check so the lender stays happy. That’s a […]
Vapor Intrusion: The Silent Project Killer and How to Proactively Manage the Risk
It’s 7:00 AM on a Tuesday. You’re on-site, the concrete trucks are scheduled for next week, and your lender just called. They’ve been reviewing the latest round of indoor air data, and suddenly, your "clean" site isn’t so clean. They’re seeing hits of Trichloroethylene (TCE) or Tetrachloroethylene (PCE) that weren't there in the initial Phase […]
Vapor Intrusion and Mitigation: The NYC Developer’s Guide to Avoiding Long-Term Liability
In the high-stakes world of New York City real estate development, what you can’t see is often more dangerous than what you can. You’ve likely managed the obvious hurdles: zoning variances, foundation challenges, and the rising costs of materials. But beneath the surface of many NYC sites lies a "silent" liability that can stall a […]