124 Neb. Admin. Code, ch. 9, § 001
Only a certified professional, a professional engineer, a registered environmental health specialist, or a person under their direct supervision may engage in the inspection, pumping, siting, layout, construction, reconstruction, alteration, modification, repair, closure or otherwise changing of an onsite wastewater treatment system. For the purposes of these regulations, "direct supervision" means the person overseeing the work is physically present on the site where the work is being done and has control over, responsibility for, and professional knowledge of the work being done. The certification requirement does not apply to a private onsite wastewater treatment system at an electric generation facility site owned by a district organized under Nebraska Revised Statutes, Chapter 70, article 6.
124 Neb. Admin. Code, ch. 9, § 001