Chief Justice Rehnquist, with whom Justice Scalia and Justice Thomas join, dissenting.
For over half a decade petitioners were prohibited from building homes, or any other structures, on their land. Because the Takings Clause requires the government to pay compensation when it deprives owners of all economically viable use of their land, see Lucas v. South Carolina Coastal Council, 505 U.S. 1003 (1992), and because a ban on all development lasting almost six years does not resemble any traditional land-use planning device, I dissent.
I
“A court cannot determine whether a regulation has gone ’too far’ unless it knows how far the regulation goes.” MacDonald, Sommer & Frates v. Yolo County, 477 U.S. 340, 348 (1986) (citing Pennsylvania Coal Co. v. Mahon, 260 U.S. 393, 415 (1922)). In failing to undertake this inquiry, the Court ignores much of the impact of respondent’s conduct on petitioners. Instead, it relies on the flawed determination of the Court of Appeals that the relevant time period lasted only from August 1981 until April 1984. Ante, at 7, 9. During that period, Ordinance 81—5 and Regulation 83—21 prohibited development pending the adoption of a new regional land-use plan. The adoption of the 1984 Regional Plan (hereinafter Plan or 1984 Plan) did not, however, change anything from the petitioners’ standpoint. After the adoption of the 1984 Plan, petitioners still could make no use of their land.
The Court of Appeals disregarded this post-April 1984 deprivation on the ground that respondent did not “cause” it. In a §1983 action, “the plaintiff must demonstrate that the defendant’s conduct was the actionable cause of the claimed injury.” 216 F.3d 764, 783 (CA9 2000). Applying this principle, the Court of Appeals held that the 1984 Regional Plan did not amount to a taking because the Plan actually allowed permits to issue for the construction of single-family residences. Those permits were never issued because the District Court immediately issued a temporary restraining order, and later a permanent injunction that lasted until 1987, prohibiting the approval of any building projects under the 1984 Plan. Thus, the Court of Appeals concluded that the “1984 Plan itself could not have constituted a taking,” because it was the injunction, not the Plan, that prohibited development during this period. 216 F.3d, at 784. The Court of Appeals is correct that the 1984 Plan did not cause petitioners’ injury. But that is the right answer to the wrong question. The causation question is not limited to whether the 1984 Plan caused petitioners’ injury; the question is whether respondent caused petitioners’ injury.
We have never addressed the §1983 causation requirement in the context of a regulatory takings claim, though language in Penn Central Transp. Co. v. New York City, 438 U.S. 104 (1978), suggests that ordinary principles of proximate cause govern the causation inquiry for takings claims. Id., at 124. The causation standard does not require much elaboration in this case, because respondent was undoubtedly the “moving force” behind petitioners’ inability to build on their land from August 1984 through 1987. Monell v. New York City Dept. of Social Servs., 436 U.S. 658, 694 (1978) (§1983 causation established when government action is the “moving force” behind the alleged constitutional violation). The injunction in this case issued because the 1984 Plan did not comply with the 1980 Tahoe Regional Planning Compact (Compact) and regulations issued pursuant to the Compact. And, of course, respondent is responsible for the Compact and its regulations.
On August 26, 1982, respondent adopted Resolution 82—11. That resolution established “environmental thresholds for water quality, soil conservation, air quality, vegetation preservation, wildlife, fisheries, noise, recreation, and scenic resources.” California v. Tahoe Regional Planning Agency, 766 F.2d 1308, 1311 (CA9 1985). The District Court enjoined the 1984 Plan in part because the Plan would have allowed 42,000 metric tons of soil per year to erode from some of the single-family residences, in excess of the Resolution 82—11 threshold for soil conservation. Id., at 1315; see also id., at 1312. Another reason the District Court enjoined the 1984 Plan was that it did not comply with article V(g) of the Compact, which requires a finding “with respect to each project, that the project will not cause the established [environmental] thresholds to be exceeded.” Id., at 1312. Thus, the District Court enjoined the 1984 Plan because the Plan did not comply with the environmental requirements of respondent’s regulations and of the Compact itself.