Rule 15-18-77-2.1.31 - Certified Installer Training Program and Examination1. Those persons taking written examination specified in Section 41-67-25(3)(b) shall pay a fee for such testing as determined by the Department based on the actual costs of preparing and administering the examinations. 2. Attendance of the Department's 2 day Certified Installers training course. 3. Applicant must achieve a score of 80% or better on the closed book examination. 4. All persons completing the above items will be granted a probationary certificate. A person will be probationary until he/she installs 3 Individual On-site Wastewater Disposal Systems as indicated from a Permit/Recommendation and work has been inspected by the Division during installation with no deficiencies indicated on Inspection (Form 305). Probationary status will remain in effect until person is deemed competent by the Division. 15 Miss. Code. R. 18-77-2.1.31