- Study guides, Revision notes & Summaries

The On-Site Wastewater System Installer Licensing Exam is a professional certification test that assesses an individual’s knowledge and competence in the proper design, installation, and maintenance of on-site wastewater treatment and disposal systems, such as septic tanks and drain fields. The exam questions cover key topics including soil science, site evaluation, system sizing, construction materials, installation techniques, safety procedures, and regulatory compliance. Each question is pr...