3 P.S. § 911 (2009)
§ 911. Limitation on local regulations
(a) GENERAL RULE:.Every municipality or political subdivision within which an agricultural security area is created shall encourage the continuity, development and viability of agriculture within such an area by not enacting local laws or ordinances which would unreasonably restrict farm structures or farm practices within the area in contravention of the purposes of this act unless such restrictions or regulations bear a direct relationship to the public health or safety.
(b) PUBLIC NUISANCE.: Any municipal or political subdivision law or ordinance defining or prohibiting a public nuisance shall exclude from the definition of such nuisance any agricultural activity or operation conducted using normal farming operations within an agricultural security area as permitted by this act if such agricultural activity or operation does not bear a direct relationship to the public health and safety.