PFAS has changed the transaction baseline
PFAS is a large group of synthetic fluorinated substances valued for resistance to water, oil, heat and chemicals. Those same properties make many PFAS persistent and mobile after release. ECHA notes that PFAS contamination is frequently found in soil, groundwater and surface water and can be technically difficult and costly to address.
For a property transaction, that does not make PFAS a universal deal breaker. It makes historic use more important. The environmental review should establish whether a plausible source existed, where a release could have occurred, which receptors or project activities could be affected and whether better evidence could change the transaction decision.
Start with the activity history, not a standard laboratory panel
The Danish Environmental Protection Agency has mapped business sectors that may have used PFAS and could therefore represent sources to soil and groundwater. Region Zealand's broader screening list includes fire-training and fire-related activities, landfills and fill sites, chrome plating, metalworking, chemical production, textiles and leather, carpets, paper and board, paint, plastics, dry cleaning, electronics and printing.
A sector name is a screening clue, not proof of use or release. The review should look for the particular processes, products, dates and locations that matter: firefighting-foam storage or testing, wet-process areas, impregnation, plating baths, waste handling, floor drains, sumps, unsealed yards and historical disposal areas.
- Who occupied the property, and which activities took place in each building or yard?
- Were PFAS-containing products plausible during the relevant operating period?
- Where were chemicals, firefighting foams, wastes and process water stored or handled?
- Could drains, soil, fill, groundwater or surface water have carried a release beyond the source area?
- Would redevelopment, excavation, dewatering or a more sensitive use disturb the current risk picture?
V1, V2 and a clean map answer only part of the question
V1 mapping records knowledge of activities that may have caused contamination; V2 mapping requires evidence that contamination is present. Both are essential transaction records, but neither tells a buyer automatically whether PFAS was included in the historical assessment or analytical programme.
Danish Regions estimates that about 15,000 properties may be affected by PFAS-related activities. It also warns that many are already mapped for other contaminants, while owners may not know that PFAS could also be relevant because earlier investigations pre-dated routine PFAS assessment, criteria changed or the list of relevant sectors expanded. Even a property that is not currently mapped for PFAS therefore needs its documentary history read carefully.
Investigate when the result could change a decision
Sampling adds value when the desktop review identifies a credible source and the result could affect price, timing, financing, planned works, soil handling, water management or the allocation of responsibility. A former fire-training area near a groundwater receptor is a different proposition from an office occupying a building with no relevant activity history.
The first response may still be documentary rather than intrusive. Missing environmental files, product records, drainage drawings, fire-safety documentation or previous laboratory schedules can sometimes resolve whether PFAS is genuinely in scope. If uncertainty remains material, the investigation should be targeted to the decision rather than expanded by default.
A useful sampling strategy follows source, pathway and receptor
PFAS can move differently from familiar petroleum hydrocarbons and chlorinated solvents. Investigation design should consider where the substance may have been released, how water moves through the site, the position of drains and utilities, groundwater direction, nearby abstraction and the possibility of discharge to surface water.
The sampling medium and locations must match the question. Soil may help define a source area; groundwater may be more important for migration; surface water, sediment or drainage water may matter where a discharge route is plausible. The analytical scope, reporting limits and quality controls should be agreed with the laboratory and interpreted against the applicable Danish criteria rather than treated as a simple detected/not-detected exercise.
Translate the evidence into a transaction and development response
A confirmed or credible PFAS issue can affect more than remediation cost. It may influence excavation and disposal routes, dewatering, discharge permissions, programme contingencies, future land use and engagement with the municipality, region or water utility. These consequences should be separated from the mere fact that a substance was detected.
Environmental findings can support a price allowance, further work before closing, a defined post-acquisition plan or contractual protection prepared by the parties' legal advisers. ACED Miljø's role is to make the technical uncertainty, likely pathways and proportionate next steps clear; legal responsibility and contractual wording remain matters for the relevant legal advisers and authorities.
Record the regulatory basis because it is still developing
Danish quality criteria and management practice have changed as knowledge of PFAS has developed. The national PFAS action plan includes funding for contaminated-soil and drinking-water measures, while the EU restriction process continues to address future manufacture and use. These developments do not by themselves determine liability for a particular property, but they can change stakeholder expectations, analytical practice and the cost or feasibility of future management.
A decision-ready report should therefore state which records were reviewed, which PFAS were analysed, which criteria were applied and what was outside scope. That audit trail allows a future owner to understand the conclusion if regulation, project design or scientific knowledge changes.
Official sources