Courts distinguish between a categorical taking, which occurs when a regulation deprives property of all economically beneficial use as recognized in Lucas v. South Carolina Coastal Council, and a regulatory or ad hoc taking analyzed under the multifactor Penn Central test, which weighs the regulation's economic impact, its interference with reasonable investment-backed expectations, and the character of the government action. A permit denial that leaves the property with some, even greatly diminished, economic use typically falls into the harder-to-win ad hoc category.

The Supreme Court's decision in Knick v. Township of Scott eliminated the prior requirement that a plaintiff exhaust state compensation remedies before bringing a federal takings claim, easing the path directly into federal court, though plaintiffs still frequently litigate in the U.S. Court of Federal Claims or state court depending on whether the challenged action is federal or state. A recurring and often outcome-determinative dispute is the denominator problem — whether the relevant parcel for measuring economic impact is the specific regulated portion of the property or the owner's entire contiguous holding.

Because the denominator question and the choice between categorical and ad hoc analysis can each independently determine the outcome, takings litigation in the environmental permitting context carries unusually binary stakes for a given fact pattern. A Juricratic simulation can model denominator framing and categorical-versus-ad-hoc classification as separate dials, letting a landowner or agency rehearse how each choice shifts the odds of a compensable taking finding.

Environmental takings claims typically follow a wetlands fill permit denial, an endangered species habitat restriction, or a land-use regulation adopted for environmental protection, with the litigation centered on the economic impact of the restriction, the relevant parcel for measuring that impact, and whether any economically viable use remains.