(a) Pathogens—sewage sludge (other than domestic septage). The Class A pathogens requirements in §503.32(a) or one of the Class B pathogen requirements in §503.32 (b)(2) through (b)(4) shall be met when sewage sludge is placed on an active sewage sludge unit, unless the vector attraction reduction requirement in §503.33(b)(11) is met.

(b) Vector attraction reduction—sewage sludge (other than domestic septage). One of the vector attraction reduction requirements in §503.33 (b)(1) through (b)(11) shall be met when sewage sludge is placed on an active sewage sludge unit.

(c) Vector attraction reduction—domestic septage. One of the vector attraction reduction requirement in §503.33 (b)(9) through (b)(12) shall be met when domestic septage is placed on an active sewage sludge unit.