Phase 1 Environmental Site Assessment (ESAs)
Protect your investment. Uncover risk. Stay compliant.
KOW Building Consultants provides ASTM-compliant Phase 1 Environmental Site Assessments (ESAs) to help clients evaluate potential environmental risks before closing a real estate transaction. Our reports support financing, acquisition, and redevelopment strategies, ensuring due diligence, liability protection, and long-term peace of mind.
Whether you're pursuing a HUD-insured loan, working with Fannie Mae or Freddie Mac, or acquiring a value-add asset, our team delivers clear, timely reports trusted by lenders, equity partners, and developers across the country.
What Is a Phase 1 ESA (Environmental Site Assessment)?
A Phase I ESA is a non-intrusive environmental study that evaluates a property’s current and historical use to determine the likelihood of environmental contamination in soil, groundwater, or vapor. Conducted according to ASTM E1527-21 standards (updated from E1527-13), the ESA helps clients comply with All Appropriate Inquiry (AAI) requirements under CERCLA and supports the Innocent Landowner Defense.
The goal: identify any Recognized Environmental Conditions (RECs) that could pose a legal, financial, or regulatory liability.
Who Needs a Phase 1 ESA?
Phase 1 ESAs are typically required by:
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Lenders issuing loans secured by real estate
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Developers acquiring urban or industrial properties
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Investors pursuing brownfield or value-add opportunities
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Public agencies involved in land transfers or funding
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Owners seeking environmental risk mitigation during disposition
KOW’s ESA reports meet or exceed requirements for:
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HUD (MAP & LEAN)
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SBA 504 and 7(a) loans
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Fannie Mae & Freddie Mac due diligence
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Private equity & institutional investors
What’s Included in a Phase 1 ESA?
Each Phase I ESA is completed by a qualified team with deep experience in environmental due diligence and regulatory compliance.
Records Review
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Federal, state, and tribal environmental databases
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Historical aerials, topographic maps, Sanborn fire insurance maps
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City directories, title records, building permits
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Regulatory records from fire departments, DOH, DEC, etc.
Site Visit
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Visual inspection of the property and adjoining parcels
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Documentation of hazardous substances, storage tanks, stains, or stressed vegetation
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Identification of above-ground and underground storage tanks (ASTs and USTs)
Interviews
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Current and past property owners, occupants, and managers
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Local agencies (fire, health, building departments)
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Report user input (to meet AAI user obligations)
Evaluation & Report
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Summary of findings and conclusions
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Identification of RECs, HRECs, and CRECs
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Photographic documentation and site map
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Recommendations for Phase II (if needed)
Additional Environmental Investigation Services
In addition to Phase I ESAs, KOW provides a wide range of environmental due diligence services tailored to meet lender, agency, and client-specific requirements. Whether you're evaluating risk early, responding to specific concerns, or fulfilling ongoing obligations, we offer the flexibility and expertise to support your project.
Environmental Transaction Screens
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A cost-effective alternative to a full Phase I for low-risk properties or portfolio screening.
Desktop Environmental Reviews
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High-level research and risk flagging—ideal for early-stage underwriting or preliminary diligence.
HRD & HRDR Reports
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Housing Rehabilitation Determinations and Housing Rehabilitation Determination Reports for agency funding, particularly HUD, HPD, and HDC.
Custom Scope Reviews
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We build tailored assessments to match your lender, agency, or internal risk requirements.
Operations & Maintenance (O&M) Plans
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Clear guidance for managing known environmental materials during occupancy or renovation.
Mold & Moisture Management
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Visual evaluations, documentation, and risk flagging for dampness and biological growth.
Our Environmental Qualifications & Certifications
KOW is trusted by lenders, housing agencies, and developers because of our deep experience and technical credibility. Our team brings certified expertise across multiple environmental disciplines to ensure your projects are supported from every angle.
Certifications & Credentials Include:
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Professional Engineer (PE)
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Registered Architect (RA)
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ASTM Phase I & Phase II ESA Training Certified
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Certified Commercial Mold Inspector
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24-Hour Asbestos-Containing Materials (ACM) Certified
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Certified Lead-Based Paint Subcontractor
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NYC Health Homes Certified Consultant
Why Choose KOW Building Consultants for Environmental Due Diligence?
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Nationwide coverage for lenders, developers, and REITs
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ASTM E1527-21 compliant reports prepared by qualified EPs
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Trusted by HUD, SBA, and institutional lenders
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Quick turnaround options to meet deal deadlines
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Seamless coordination with Phase II ESAs, IPNAs, and PCAs
Get Started with KOW
Environmental risk doesn’t have to derail your deal. KOW helps you uncover issues early, respond with confidence, and protect your investment from day one.
Email Us: incoming@kowbc.com
Call Us: (855) 966-5888
Phase 1 ESA Blogs
FAQs: Phase 1 Environmental Site Assessments
What is a Phase 1 Environmental Site Assessment (Phase 1 ESA)?
A Phase 1 ESA is a due-diligence investigation of a commercial property's environmental condition, conducted to the ASTM E1527-21 standard. It identifies Recognized Environmental Conditions (RECs) — signs of existing or potential contamination from past or present property use. The assessment is non-intrusive: it relies on records review, a site visit, and interviews, with no soil or groundwater sampling.
What does a Phase 1 ESA include?
A Phase 1 ESA includes a review of historical records (aerial photos, fire insurance maps, city directories), regulatory database research, a physical site reconnaissance, interviews with owners and occupants, and a review of the property's chain of title for environmental liens. The deliverable is a written report documenting any RECs and a professional opinion on environmental risk.
When do I need a Phase 1 ESA?
A Phase 1 ESA is typically required before purchasing, refinancing, or developing commercial real estate. Lenders almost always require one as a condition of financing, and completing it is how a buyer qualifies for the "innocent landowner" and other liability protections under federal CERCLA law through All Appropriate Inquiries (AAI).
How long does a Phase 1 ESA take?
Most Phase 1 ESAs take roughly two to three weeks from authorization to final report, depending on property size, complexity, and how quickly third-party records and interviews come back. Expedited turnaround is often available when a transaction timeline is tight.
How much does a Phase 1 ESA cost?
Cost varies with property type, size, location, and complexity. For a detailed breakdown of pricing factors and typical ranges, see our guide to Phase 1 Environmental Site Assessment cost. KOW provides fixed-fee quotes upfront so there are no surprises.
What is a Recognized Environmental Condition (REC)?
A REC is the presence, or likely presence, of hazardous substances or petroleum products on a property under conditions that indicate an existing release, a past release, or a material threat of a future release. Identifying RECs is the central purpose of a Phase 1 ESA.
Does KOW perform Phase 1 ESAs nationwide?
Yes. KOW Building Consultants conducts Phase 1 Environmental Site Assessments for commercial properties across the country, with reports prepared by qualified Environmental Professionals to the current ASTM E1527-21 standard.
