25 Pa. Code § 243.13
(a) A person maintaining a slaughterhouse, rendering works, depository of dead animals, glue works, tannery, wool-washing establishment, paper mill, byproduct coke oven, dye works, oil refinery, dairy, creamery, cheese factory, milk station or similar establishment; or engaged in the manufacture of gas chemicals, explosives, fertilizers or similar products; or in the business of soapmaking, fish oil extraction, bone boiling or a similar occupation, may not allow any of the following:
(2) A substance which is deleterious or detrimental to public health to:
(c) A pigsty or piggery may not be built or maintained on marshy ground or land subject to overflow, nor where it may prejudicially affect a water supply, nor where, as a source of vector breeding, it may become a menace to the public health, particularly in the following circumstances: