Environmental due diligence is a critical part of any real estate transaction. Whether you’re purchasing, financing, or redeveloping a property, understanding environmental risk is key to protecting your investment.
In many cases, a full Phase I Environmental Site Assessment (ESA) is the standard choice. It’s thorough, compliant with the All Appropriate Inquiries (AAI) rule, and offers liability protection under CERCLA. However, there are situations where that level of investigation is not necessary. For lower-risk properties, a faster and more cost-effective option exists: the Environmental Transaction Screen (ETS).
What Is an Environmental Transaction Screen (ETS)?
An Environmental Transaction Screen (ETS), developed under ASTM E1528, is a streamlined due diligence tool intended for low-risk property transactions. While it does not provide legal liability protection, it can identify readily observable or known environmental concerns, offering valuable insights without the cost and time required for a Phase I ESA.
The ETS is particularly well-suited for situations where:
- Contamination is unlikely
- Time and budget constraints are a factor
- The goal is to make early, informed decisions
How the ETS Process Works
At Moran Consultants, our ETS process is designed to meet ASTM E1528 requirements while staying focused and efficient:
- Visual Inspection – A qualified environmental professional or trained personnel visits the site to identify any observable signs of concern.
- Transaction Screen Questionnaire – Completed according to ASTM standards, combining site observations with available documentation and user-provided knowledge.
- Limited Records Review – Includes one historical source (such as an aerial photograph or Sanborn map) and basic environmental database summaries, if accessible.
- Professional Opinion – An expert conclusion on whether findings warrant additional investigation or escalation to a Phase I ESA.
When to Use an ETS
An ETS can be the right choice when:
- The property has a low-risk use history (residential, office, or undeveloped land)
- There is no known history of hazardous materials use or releases
- CERCLA liability protection is not required
- You need a quick preliminary screening before committing to a deal
- The review is for internal purposes without lender or investor requirements
By focusing only on the most relevant factors for low-risk sites, an ETS can help you make timely, confident decisions without unnecessary expense.
When an ETS May Not Be Enough
An ETS is not appropriate in every situation. Properties with an industrial or high-risk history, known environmental concerns, or transactions requiring CERCLA liability protection should undergo a full Phase I ESA. Lenders or investors may also require the broader scope and compliance offered by a Phase I ESA.
In these cases, the Phase I ESA’s comprehensive review, covering regulatory records, multiple historical sources, and a detailed site investigation, provides the necessary level of assurance.
Why Work with Moran Consultants
With decades of experience providing environmental due diligence nationwide, Moran Consultants can guide you in selecting the right assessment for your project. If an ETS reveals concerns, we can seamlessly transition into a Phase I ESA to further evaluate and address potential risks. Our in-house professionals ensure each step is handled efficiently, accurately, and in line with industry standards.
The Environmental Transaction Screen (ETS) is a practical, cost-effective option for evaluating environmental risk in low-risk property transactions. While it doesn’t replace the legal protections of a Phase I ESA, it offers valuable insight to support early decision-making.
If you’re unsure whether an ETS or a Phase I ESA is right for your property, Moran Consultants can help you determine the best approach—keeping your project on track and your investment protected.