---
title: "Phase 1 Environmental Site Assessment (ESA) | ASTM E1527-21 | Calibre"
description: "Phase 1 ESA services compliant with ASTM E1527-21. Environmental due diligence for commercial property acquisitions and lender requirements. Boise, ID."
url: https://calibre.multisites.ai/cre-services/esa-environmental-site-assessments
publisher: Calibre Commercial Inspections
phone: "+1-208-305-6245"
email: Schedule@CalibreCBI.com
---

ASTM E1527-21

# Phase 1 ESA (Environmental Site Assessment)

In short

Phase 1 ESA services compliant with ASTM E1527-21. Environmental due diligence for commercial property acquisitions and lender requirements. Boise, ID.

#### Comprehensive Environmental Due Diligence for Your Property

At Calibre CBI, we understand that purchasing or managing a commercial property comes with significant responsibility. A Phase 1 Environmental Site Assessment (ESA) is a critical step in identifying potential environmental risks before they become costly liabilities. Our expert team provides thorough, reliable assessments to help you make informed decisions with confidence.

#### What is a Phase 1 Environmental Site Assessment?

A Phase 1 ESA is a detailed investigation designed to uncover potential or existing environmental contamination on a property. Required by many lenders and aligned with the ASTM E1527-21 standard, this assessment protects property owners, investors, and buyers by evaluating historical and current site conditions. Whether you’re acquiring a new property or ensuring compliance, our Phase 1 ESA services deliver peace of mind.

#### Our Process

Calibre CBI’s Phase 1 ESA services are tailored to meet your needs while adhering to industry best practices. Our comprehensive approach includes:

-   Site Inspection: A meticulous walkthrough of the property to identify visible signs of environmental concerns, such as chemical storage or soil discoloration.
    
-   Historical Records Review: Examination of past property uses, aerial photographs, and local records to detect potential risks from previous activities.
    
-   Regulatory Database Search: Analysis of federal, state, and local environmental records to assess nearby contamination sources.
    
-   Interviews: Conversations with owners, occupants, or local officials to gather additional insights about the property’s history.
    
-   Detailed Reporting: A clear, concise report summarizing findings, potential risks, and recommendations for next steps.
    

#### Why Choose Calibre CBI?

-   Expertise: Our certified inspectors bring years of experience in environmental assessments, ensuring accuracy and reliability.
    
-   Compliance: We strictly follow ASTM E1527-21 guidelines to meet lender and regulatory requirements.
    
-   Risk Mitigation: Identify environmental issues early to avoid unexpected cleanup costs or legal challenges.
    
-   Client-Focused Service: We prioritize your timeline and budget, delivering results you can trust.
    

#### Protect Your Investment Today

A Phase 1 ESA is more than just a requirement—it’s a safeguard for your financial and operational success. Let Calibre CBI help you navigate the complexities of environmental due diligence with precision and care. Contact us today to schedule your Phase 1 Environmental Site Assessment or to discuss your specific property needs.

## From Inspector Insights

EnvironmentalOct 13, 2026

### [How Long Is a Phase I ESA Valid? 180 Days and 1 Year](https://calibre.multisites.ai/cre-inspector-insights/how-long-is-a-phase-i-esa-valid)

EnvironmentalOct 13, 2026

### [SBA 7(a) and 504 Loans: Is a Phase I ESA Required?](https://calibre.multisites.ai/cre-inspector-insights/sba-7a-504-phase-i-esa-required)

EnvironmentalOct 13, 2026

### [PFAS and Phase I ESAs: What CRE Buyers Should Ask](https://calibre.multisites.ai/cre-inspector-insights/pfas-and-phase-i-esas-what-cre-buyers-should-ask)

## Need a Phase I Environmental Site Assessment?

Calibre serves Idaho, Eastern Washington, Northeastern Oregon and Western Montana. Send the property details and your timeline for a proposal.

[Request a proposal](https://calibre.multisites.ai/request-proposal) [(208) 305-6245](tel:+12083056245)