No. The additional water from irrigation systems could “flood” the system and adversely affect its operation. For the same reason, floor and roof drains, sump pumps, gutter systems, etc. should not discharge into or near the system. Grading and surface diversions (”swales”) should be located so as to redirect storm water run-off away from the system. The ground surface over the treatment field should be “crowned” in order to prevent ponding of surface water over the treatment field.