But as we learn in Property class, why should there be a first-in-time, first-in-right rule? Why should a feedlot essentially foreclose residential development by virtue of being there first? Back when Phoenix was a growing city and residential development was a valuable activity (let's not talk about the water usage for now), why should a feedlot stay there just because it was there? The Arizona court held in Spur Industries v. Del E. Webb that it shouldn't, and sided with Del Webb -- to an extent. Spur had to move its feedlot, but Webb had to pay the move. My students generally like that result, as land moves to its most valuable use (let's not talk about the water usage for now), and the feedlot is made whole. The "coming to the nuisance" defense is not an absolute defense, but merely a factor.
But that case did not sit well with farmers. In every single state plus Puerto Rico, some form of a "Right-to-Farm" law was passed. RTF statutes provide farms with a defense to nuisance claims by plaintiffs that migrate toward (or "come to") any allegedly nuisance-creating farm. RTF statutes commonly set out some definition of the agricultural operations that can raise the defense, a list of permitted operational changes that can be undertaken without losing the defense, and some time limit that serves as an effective statute of limitations on any claims of nuisance against a farm.
So now the coming to the nuisance defense *is* (to varying degrees and subject to lots of qualifications) an absolute defense. Are we happy?
The usual justification of Right-to-farm laws of protecting farms from encroaching residential development rings hollow in light of modern developments in agricultural operations. For example, in Parker v. Obert's Legacy Dairy, an Indiana court upheld a fairly long-standing interpretation of Indiana's Right-to-Farm law as protecting a farm that expanded operations from about 100 cows to almost 1000, holding that such a change was not a "significant change" in the type of agricultural operation, and could therefore not be the subject of a nuisance lawsuit brought by neighbors.