OSSF INSTALLER 1 LICENSE EXAM 2026 – ACTUAL QUESTIONS WITH 100% CORRECT ANSWERS, RATIONALES & GRADED A+ (TEXAS ON-SITE SEWAGE FACILITY CERTIFICATION PREP)

May 11, 2026

SECTION 1: REGULATORY FRAMEWORK & LICENSING (Questions 1-25)

Question 1: Which Texas agency has primary regulatory authority for On-Site

Sewage Facilities (OSSFs) statewide?

• A) Texas Department of Health

• B) Texas Commission on Environmental Quality (TCEQ)

• C) Texas Water Development B...