Expert types
Environmental evidence: constraints that dominate value
Contamination, wetlands and regulatory designations can control what a property is worth more completely than any other factor, and they cut in both directions.
Scope
The questions this expert answers
Is the property contaminated
Phase one and phase two assessment, which the agency will often have commissioned already.
What does remediation cost
Where contamination exists, the cost can exceed the land value and inverts the valuation entirely.
How much of the site is buildable
Wetland delineation and flood designation determine developable area, which drives highest and best use.
Does a designation rule out the use
Habitat, wetland or floodway constraints can make a claimed higher use impossible rather than merely difficult.
Who is liable afterwards
Environmental liability on acquired land is a negotiated question and a significant one.
Was the condition caused by the project
Construction can create or spread contamination, which is a separate claim from the taking.
Selection
Qualifications and what to check
| Criterion | What to look for |
|---|---|
| Credentials | Licensed environmental professional, geologist or engineer as the issue requires |
| Assessment experience | Phase one and phase two work to the recognised standards |
| Regulatory familiarity | With the state agency and the federal programmes that apply |
| Delineation | Wetland delineation accepted by the regulator, not merely asserted |
| Independence | No current engagement with the condemning agency on this corridor |
In practice
It cuts both ways, which owners sometimes forget
Environmental evidence is usually introduced by owners to show that a constraint was overstated: that the wetland line is narrower than mapped, that the flood designation does not cover the buildable area, that the contamination is historic and contained.
It is equally often introduced by agencies to show that a claimed higher use was never available. A development valuation on land that is half wetland will not survive a delineation.
The practical point is to establish the facts before building a valuation argument on them, rather than discovering them in the other side’s report.
Questions about this expert
The agency says my land is contaminated and reduced the offer
Ask for the assessment. Contamination findings are frequently based on historic use rather than sampling, and the remediation estimates attached to them are often generic.
Does contamination reduce compensation
It can, substantially, because a buyer would price the remediation. Whether the discount applied is justified is exactly what an independent assessment tests.
Who is responsible for cleanup after they take it
A negotiated and jurisdiction specific question that should be settled in the acquisition documents rather than left open.
The expert decides the number more often than the argument does
In condemnation the facts in dispute are technical. Who presents them, and how well, is usually what the case turns on.