Section 591.1 - Basic requirements(a) All official plants must comply with the sanitation requirements contained in part 416 of this chapter, Sanitation, except as otherwise provided in this chapter.(b) All official plants must comply with the Hazard Analysis and Critical Control Point (HACCP) Systems requirements contained in part 417 of this chapter, except as otherwise provided in this chapter.(c) For the purposes of this chapter, parts 416, Sanitation, 417, Hazard Analysis and Critical Control Point (HACCP) Systems, and 500, Rules of Practice, an official establishment or establishment includes an official plant. 85 FR 68685 , 12/28/2020except for 591.1(a) and 591.2(b), which are effective 10/29/2021and 591.1(b), and 591.2(a) and (c), which are effective 10/31/2022; 85 FR 68685 , 12/28/2020