OSSF INSTALLER 2 EXAMINATION STUDY
GUIDE 2026 QUESTIONS WITH ANSWERS
◉ 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
◉ What is the primary purpose of a septic tank? Answer: Separate
solids from liquids
◉ What do septic tank baffles prevent? Answer: Solids from exiting
the tank
◉ What must access openings be? Answer: Accessible to grade
GUIDE 2026 QUESTIONS WITH ANSWERS
◉ 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
◉ What is the primary purpose of a septic tank? Answer: Separate
solids from liquids
◉ What do septic tank baffles prevent? Answer: Solids from exiting
the tank
◉ What must access openings be? Answer: Accessible to grade
