CERCLA gives buyers several paths to limit exposure to legacy contamination, but the right defense depends on how the property is acquired, what buyers learn before closing and how they manage the site afterward

By Derek Street, Brownfields & Community Revitalization Practice, Onterris

Key takeaways

• Contaminated property can create liability for current owners under the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA), even when the contamination occurred under a previous owner.
  
• The bona fide prospective purchaser (BFPP) protection is available for many brownfield acquisitions, including properties with known contamination, but buyers must satisfy requirements both before and after purchase.
• All Appropriate Inquiries (AAI), generally completed through a compliant Phase I Environmental Site Assessment (ESA), must meet federal timing, documentation and investigative requirements.
• CERCLA also offers innocent landowner and contiguous property owner protections, but each depends on what the buyer knew and when, and protections held by a public seller do not transfer to a private buyer.
• Environmental findings should continue to inform property management and redevelopment decisions after closing because missed obligations can affect liability protection, financing, funding and project plans.

Redeveloping a former industrial facility, abandoned commercial parcel or other brownfield can return underused land to productive use, strengthen communities and create economic value. The environmental history that made the property available for redevelopment; however, can also follow it into the next transaction.

CERCLA, commonly called Superfund, gives the U.S. Environmental Protection Agency (EPA) authority to address releases and threatened releases of hazardous substances and pursue parties that may be responsible. A current owner can face exposure for contamination associated with activities that took place long before the property changed hands. CERCLA liability may be strict, retroactive and, in some circumstances, joint and several, meaning one responsible party can be required to cover the full cleanup cost even when other parties also contributed to the contamination.

Federal law also provides ways for qualifying owners to manage that risk. The central question for a buyer is not simply whether a defense exists. It is which protection applies, what must happen before title transfers and what responsibilities continue throughout ownership.

Start by identifying the right liability pathway

Congress expanded and clarified CERCLA landowner protections through the 2002 Brownfields amendments. One of the most useful for redevelopment is the Bona Fide Prospective Purchaser (BFPP) provision.

A qualifying BFPP may purchase property with knowledge of existing contamination without automatically becoming responsible for historic releases. The protection is self-implementing, meaning EPA does not issue it to a buyer through an application process. The owner must establish that the statutory conditions have been met and continue to satisfy applicable obligations.

For a typical BFPP acquisition, important requirements include:

• Taking title after January 11, 2002
• Completing All Appropriate Inquiries (AAI) before acquiring the property
• Have no affiliation with a party potentially liable for the contamination, including familial, contractual, financial or certain corporate relationships
• Show that all disposal of hazardous substances at the site occurred before acquisition
• Take reasonable steps to stop continuing releases, prevent threatened releases and limit exposure to earlier releases
• Comply with land use restrictions and not impede institutional controls
• Provide full cooperation, assistance and access to those authorized to conduct response actions
• Comply with CERCLA information requests and administrative subpoenas, and provide legally required notices
• Not impede a response action or natural resource restoration
• These requirements change the role of environmental due diligence. A Phase I ESA is not simply information for a lender or a summary of property history. When structured to meet AAI, it can become part of the legal foundation for managing CERCLA exposure.

Price the windfall lien and the lease structure

BFPP status limits liability for response costs, but it does not eliminate every financial exposure. If EPA has performed a response action at the property, has unrecovered costs and its work increased the property’s fair market value, EPA may place a windfall lien on the property, limited to that increase. Buyers should ask early whether federal response costs exist and whether EPA can address the lien through a comfort letter or agreement.

Developers entering through a ground lease should also confirm their status. The 2018 BUILD Act clarified that tenants can qualify for BFPP protection, either through the owner’s status or by meeting the requirements themselves.

AAI has both a technical standard and a transaction clock

AAI is the federal process for investigating environmental conditions and evaluating potential contamination liability before acquiring property. If a Phase I ESA follows ASTM E1527-21, EPA considers it consistent with the federal AAI requirements used to evaluate environmental conditions before a property purchase.

But compliance depends on more than using the right assessment standard.

AAI must be completed or updated within one year before the purchaser takes title. Several components have a shorter shelf life and must be performed or refreshed within 180 days of acquisition. These include interviews, government record reviews, the property inspection, environmental cleanup lien searches, and the environmental professional’s signed declaration, which must appear in the written report (40 CFR § 312.21(d)). 

That timing matters when transactions are extended, closings move or a Phase I ESA prepared earlier in the deal is reused. A report that was suitable when negotiations began may require updates by closing.

The underlying inquiry also reaches beyond one database search or property walk. EPA identifies activities including:

• Interviews with current and previous owners, operators and occupants, and neighboring owners in certain abandoned property situations
• Review of historical information
• Federal, state, Tribal and local government records research
• Inspection of the property and adjoining land
• Consideration of information that is commonly known or reasonably obtainable
• Evaluation of how evident contamination may be and whether available methods could identify it
• Identification of material information gaps that affect the environmental professional’s conclusions

The findings must be documented in a written report by a qualified environmental professional.

Environmental findings need an owner after closing

Closing does not complete the BFPP process.

EPA guidance identifies continuing obligations for qualifying landowners. These can include demonstrating that disposal did not occur after acquisition, complying with land use restrictions, protecting the effectiveness of institutional controls, cooperating with authorized response activities, providing required access and notices and responding appropriately to hazardous substances on the site.

Owners must also take reasonable steps in response to contamination. Depending on site conditions, that can mean stopping an ongoing release, reducing the potential for a future release or limiting human, environmental or natural resource exposure to substances released previously. In practice, reasonable steps may be as straightforward as restricting site access, monitoring known contaminants and complying with state and local requirements.

For example, consider a former industrial property where due diligence identifies trichloroethylene (TCE) in soil and groundwater from historic degreasing operations. The acquisition may still proceed. After closing; however, a building design that ignores vapor intrusion, excavation that disturbs impacted soil without controls, or a tenant fit-out that compromises an engineered barrier can create new exposure pathways, and put BFPP status at risk because the owner did not take reasonable steps.

The practical response is to move environmental obligations out of the closing file and into routine site management.

That includes assigning responsibilities across environmental, legal, construction and property management teams. Document inspection records, agency correspondence, access requests, environmental notices and changing site conditions. Account for institutional controls and land use restrictions when making decisions regarding the design and tenants. And revisit the risk plan when demolition, excavation, utility work or new environmental information changes the potential for exposure or contaminant movement.

BFPP is not the only landowner protection

CERCLA recognizes two other landowner liability protections, and the differences matter when structuring a deal.

The innocent landowner (ILO) defense applies when a buyer conducts AAI before acquisition and, despite that inquiry, did not know and had no reason to know of contamination. Unlike BFPP, it is not available to a buyer who discovers contamination before closing, which makes it a narrower fallback for most brownfield purchases.

The contiguous property owner (CPO) protection applies when contamination migrates onto a property from a neighboring source the owner does not control. A CPO must also conduct AAI and must not have known of the contamination at acquisition. A buyer who knows about migrating contamination may still qualify as a BFPP.

CERCLA also provides narrow defenses for releases caused solely by an act of God, an act of war or an unrelated third party. These set a demanding standard and are rarely a sound basis for planning a transaction.

One caution applies when buying from a public seller. Municipalities, land banks and redevelopment authorities may hold liability protections or grant eligibility tied to how they acquired the property, such as through tax foreclosure or abandonment. Those protections belong to the government entity and do not pass to a private buyer, who must establish their own protection.

Weak environmental governance can affect the whole redevelopment

Loss of liability protection is not the only concern when environmental requirements are missed.

Unresolved conditions can increase potential cleanup costs, complicate lender review, affect access to grants or redevelopment funding and attract additional scrutiny during a future sale or refinancing. Construction schedules can also be disrupted when environmental constraints surface after design decisions have already been made.

The strongest approach connects due diligence to the broader business plan.

Before acquisition, buyers should align the legal, environmental and transaction teams on the intended CERCLA protection and the evidence needed to support it. They should confirm that the Phase I ESA has been scoped for AAI where that standard is required, monitor the one-year and 180-day deadlines and address significant information gaps while there is still time to investigate or modify the transaction.

After closing, the focus shifts from qualification to preservation.

 Federal protection is only part of the picture. State cleanup laws operate independently of CERCLA, and in several Northeast states they impose their own liability standards and due diligence expectations.

A practical brownfield protection framework

Decision-makers can reduce avoidable exposure by building five steps into the transaction and ownership process:

• Identify the applicable CERCLA protection early: Determine whether BFPP status, innocent landowner or contiguous property owner status best fits the acquisition facts, and confirm the approach under state law.
• Treat the closing date as an environmental deadline: Track AAI and Phase I ESA timing against the actual transfer of title
• Resolve uncertainty before it becomes operational risk: Investigate or clearly document material data gaps and recognized environmental conditions
• Assign responsibility after acquisition: Establish ownership for restrictions, controls, notices, inspections, access requirements and reasonable steps
• Update the environmental strategy as the site changes: Reassess risk when new information, construction or redevelopment activities alter site conditions

Brownfield redevelopment can turn environmental history into community and economic opportunity. CERCLA does not require buyers to avoid every contaminated property. It requires them to understand the liability framework, perform the right work at the right time and act responsibly once they become owners.

For organizations evaluating a brownfield acquisition, bringing environmental and legal advisers into the transaction before key decisions are fixed can help protect both the redevelopment strategy and the value it is intended to create.

The Author:

Derek Street is a Principal Geologist with Onterris, specializing in brownfields and community revitalization. Prior to joining the private sector, Derek served with U.S. EPA Region 4, where his work focused on Brownfields grants, Revolving Loan Fund programs, grant implementation and compliance, and land revitalization initiatives. Today, he works with communities, regional organizations, and other public-sector partners across the country to develop and implement brownfields strategies, navigate federal funding requirements, and advance contaminated and underutilized properties toward productive reuse.