Nebraska Statutes > Private Onsite Wastewater Treatment System Contractors Certification and System Registration Act > § 81-15,251 Nebraska Statutes 81-15,251. Certified professionals; additional requirements Current as of: 2023 | Check for updates | Other versions The requirements of sections 81-1506 to 81-1511 shall apply to certified professionals. Source Laws 2003, LB 94, § 16. Previous sectionNext section Private Onsite Wastewater Treatment System Contractors Certification and System Registration Act Contents