OSSF INSTALLER 1 LICENSE EXAM 2026 EXAM SCRIPT QUESTIONS AND ANSWERS STRUCTURED PREP GUIDE GRADED A+

OSSF INSTALLER 1 LICENSE EXAM 2026
EXAM SCRIPT QUESTIONS AND ANSWERS
STRUCTURED PREP GUIDE GRADED A+

⩥ Who regulates OSSF systems in Texas?
Answer: Texas Commission on Environmental Quality (TCEQ)


⩥ What type of systems can Installer I install?
Answer: Conventional (standard) systems only


⩥ Can Installer I install aerobic systems?
Answer: No


⩥ Who is responsible for obtaining the OSSF permit?
Answer: Property owner


⩥ When must an OSSF permit be issued?
Answer: Before excavation begins


⩥ Who performs the site evaluation?
Answer: Designated Representative (DR) or Professional

, ⩥ Can an Installer I perform a site evaluation?
Answer: No


⩥ What is a limiting condition?
Answer: Water table, bedrock, or restrictive soil layer


⩥ What is the minimum vertical separation for a conventional system?
Answer: 24 inches


⩥ From where is vertical separation measured?
Answer: Bottom of trench to limiting condition


⩥ If separation is 22 inches, does it pass or fail?
Answer: Fail


⩥ What is the minimum septic tank size for a single-family residence?
Answer: 1,000 gallons


⩥ What must septic tanks be?
Answer: Watertight