In 1995, the Iowa legislature adopted a provision which specifies that a livestock operation is not a nuisance unless it is proved by clear and convincing evidence that: (1) the operation unreasonably and continuously interferes with a person's enjoyment of their life or property; and (2) the injury was caused by the negligent operation of the facility.
Achenbach, Robert P. Jr.
"New Iowa Nuisance Provision,"
Agricultural Law Digest: Vol. 6
, Article 2.
Available at: http://lib.dr.iastate.edu/aglawdigest/vol6/iss14/2