COMMERCIAL SEPTIC SYSTEM
INSTALLER EXAM QUESTIONS AND
ANSWERS 100% PASS 2026 UPDATE.
All tanks must have: - ANS 2 compartments
All tanks whether pre-manufactured or constructed on site shall be constructed so that the
length is ___________ compared to the width. - ANS at least one and one- half (1 1/2)
times... "to the width."
Septic Tanks may be made of: - ANS Concrete, Plastic, fiberglass, or other materials as
approved by the department.
Tank compartment partitions will be located: - ANS Not less than two-thirds or more than
three-fourths the Length of the tank from the Inlet end.
Compartment partitions will be constructed so a pass-thru hole or slot equal to or greater than
the diameter of the inlet pipe is positioned below the liquid surface with a
_____________________________. - ANS Minimum 25% to a maximum of 50% of the total
liquid depth.
Total liquid depth for larger poured-in-place tanks shall have a maximum of
______________inches - ANS 66 inches
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, True or False: Walls and bottom of poured-in-place septic tanks must be reinforced. -
ANS True
How can a Septic tank be reinforced? - ANS six inch by 6 inch (6"x6") No.10 gage welded steel
reinforcing wire OR fibrous reinforcing material conforming to ASTM specifications for such
materials.
How must Tank Lids be Reinforced? - ANS using three-eights steel reinforcing rods (rebar)
which shall be spaced twelve inches (12") on center each way extending a minimum of two and
one half (2 1/2") inches and a maximum of three (3") from the outside edge of the tank lid.
In general, the tank must be able to withstand a uniform live load of ______________________
pounds per square foot in addition to all loads to which an underground tank is normally
subjected. - ANS 150
True or False: Walls, bottoms, and lids of poured-in-place septic tanks should have a minimum
thickness of four inches (4"). - ANS True
Tank lids shall be constructed in ______________________ pieces and shall have securable,
removable access openings located so that the inlet and outlet tees can be
________________________________. - ANS one or two,
readily accessed.
Access opening shall have a minimum of _________________ and maximum of
___________________ free space. - ANS Minimum: 15"
Maximum: 24"
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
INSTALLER EXAM QUESTIONS AND
ANSWERS 100% PASS 2026 UPDATE.
All tanks must have: - ANS 2 compartments
All tanks whether pre-manufactured or constructed on site shall be constructed so that the
length is ___________ compared to the width. - ANS at least one and one- half (1 1/2)
times... "to the width."
Septic Tanks may be made of: - ANS Concrete, Plastic, fiberglass, or other materials as
approved by the department.
Tank compartment partitions will be located: - ANS Not less than two-thirds or more than
three-fourths the Length of the tank from the Inlet end.
Compartment partitions will be constructed so a pass-thru hole or slot equal to or greater than
the diameter of the inlet pipe is positioned below the liquid surface with a
_____________________________. - ANS Minimum 25% to a maximum of 50% of the total
liquid depth.
Total liquid depth for larger poured-in-place tanks shall have a maximum of
______________inches - ANS 66 inches
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, True or False: Walls and bottom of poured-in-place septic tanks must be reinforced. -
ANS True
How can a Septic tank be reinforced? - ANS six inch by 6 inch (6"x6") No.10 gage welded steel
reinforcing wire OR fibrous reinforcing material conforming to ASTM specifications for such
materials.
How must Tank Lids be Reinforced? - ANS using three-eights steel reinforcing rods (rebar)
which shall be spaced twelve inches (12") on center each way extending a minimum of two and
one half (2 1/2") inches and a maximum of three (3") from the outside edge of the tank lid.
In general, the tank must be able to withstand a uniform live load of ______________________
pounds per square foot in addition to all loads to which an underground tank is normally
subjected. - ANS 150
True or False: Walls, bottoms, and lids of poured-in-place septic tanks should have a minimum
thickness of four inches (4"). - ANS True
Tank lids shall be constructed in ______________________ pieces and shall have securable,
removable access openings located so that the inlet and outlet tees can be
________________________________. - ANS one or two,
readily accessed.
Access opening shall have a minimum of _________________ and maximum of
___________________ free space. - ANS Minimum: 15"
Maximum: 24"
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
