California Code, Health and Safety Code - HSC § 41705

(a) Section 41700 shall not apply to odors emanating from agricultural operations necessary for the growing of crops or the raising of fowl or animals.

(b) This section shall become operative on April 1, 2003, unless the California Integrated Waste Management Board adopts and submits regulations governing the operation of organic composting sites to the Office of Administrative Law pursuant to subdivision (c) of Section 43209.1 of the Public Resources Code on or prior to that date.