COMMERCIAL SEPTIC SYSTEM INSTALLER EXAM 2026/2027 WITH ACCURATE
SOLUTIONS – GRADED A+
All tanks must have:
2 compartments
All tanks whether pre-manufactured or constructed on site shall be constructed so that the
length is ___________ compared to the width.
at least one and one- half (1 1/2) times... "to the width."
Septic Tanks may be made of:
Concrete, Plastic, fiberglass, or other materials as approved by the department.
Tank compartment partitions will be located:
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
_____________________________.
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
66 inches
True or False: Dosing tanks for SIPHONS will not be required to have one days flow
reserved.
True
True or False: All tanks must have an operating liquid capacity of 60%-70% the interior
volume of the absorption lines to be dosed.
True
All dosing tanks shall have switches and alarms that notify the owner of
_____________________.
malfunction.
When determining dosing tank requirements _____________, _________________,
_________________, and ____________________ should be taken into consideration.
volume, flow rates, waste water characteristics, and other similar information
True or False: Large capacity dosing tanks will need to be constructed on site.
True
,Dosing tanks shall have a water-tight access cover at least ____________ inches in diameter
extending to the ground or no more than ______________ inches below the ground surface.
24 inches,
12 inches
When pumps are used to does field lines, consideration must be given to the
_____________________, ________________________, and
________________________________________________.
wastewater characteristics, desired discharge rate, and total dynamic head require for the
system.
The total dynamic head is calculated by
adding the elevation difference between the discharge outlet and the lowest water level in
the dosing tank to the friction losses incurred in the discharge pipe. The velocity head can
be neglected in most applications.
For a pump to be Satisfactory in a system It must...
be able to overcome the amount of head or more at an acceptable discharge rate.
When field lines are above the elevation of the operating water level of the tank, a
_______________________ should be used to prevent the contents of discharge pipes from
emptying back into the tank.
check valve
, When field lines are below the elevation of the operating water level of the tank, a
________________________ should be placed in the discharge pipe before it exits the tank to
prevent siphoning the remaining contents of the tanks after the pump shuts off.
hole or other vacuum breaking device
_____________ are the non-mechanical alternative to pumps.
Siphons
How do Siphons work?
As the dosing tank fills, head pressure increases in the tank to a point that will force the
effluent through the siphon which is a specially designed trap, creating suction in the
discharge line that empties the contents of the dosing tank to the level of the siphon bell
and sniff hole. Equilibrium is then re-established in the line until the water level rises again
to the level that the process starts all over again.
As with pumps, single siphons are used for systems with more than ______ linear feet of
field line and alternating siphons are used for systems with more than _______ linear feet of
field line.
500, (single)
1000, (alternating)
When installing siphons, care should be taken to assure they are installed ____________ and
are _____________________________
SOLUTIONS – GRADED A+
All tanks must have:
2 compartments
All tanks whether pre-manufactured or constructed on site shall be constructed so that the
length is ___________ compared to the width.
at least one and one- half (1 1/2) times... "to the width."
Septic Tanks may be made of:
Concrete, Plastic, fiberglass, or other materials as approved by the department.
Tank compartment partitions will be located:
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
_____________________________.
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
66 inches
True or False: Dosing tanks for SIPHONS will not be required to have one days flow
reserved.
True
True or False: All tanks must have an operating liquid capacity of 60%-70% the interior
volume of the absorption lines to be dosed.
True
All dosing tanks shall have switches and alarms that notify the owner of
_____________________.
malfunction.
When determining dosing tank requirements _____________, _________________,
_________________, and ____________________ should be taken into consideration.
volume, flow rates, waste water characteristics, and other similar information
True or False: Large capacity dosing tanks will need to be constructed on site.
True
,Dosing tanks shall have a water-tight access cover at least ____________ inches in diameter
extending to the ground or no more than ______________ inches below the ground surface.
24 inches,
12 inches
When pumps are used to does field lines, consideration must be given to the
_____________________, ________________________, and
________________________________________________.
wastewater characteristics, desired discharge rate, and total dynamic head require for the
system.
The total dynamic head is calculated by
adding the elevation difference between the discharge outlet and the lowest water level in
the dosing tank to the friction losses incurred in the discharge pipe. The velocity head can
be neglected in most applications.
For a pump to be Satisfactory in a system It must...
be able to overcome the amount of head or more at an acceptable discharge rate.
When field lines are above the elevation of the operating water level of the tank, a
_______________________ should be used to prevent the contents of discharge pipes from
emptying back into the tank.
check valve
, When field lines are below the elevation of the operating water level of the tank, a
________________________ should be placed in the discharge pipe before it exits the tank to
prevent siphoning the remaining contents of the tanks after the pump shuts off.
hole or other vacuum breaking device
_____________ are the non-mechanical alternative to pumps.
Siphons
How do Siphons work?
As the dosing tank fills, head pressure increases in the tank to a point that will force the
effluent through the siphon which is a specially designed trap, creating suction in the
discharge line that empties the contents of the dosing tank to the level of the siphon bell
and sniff hole. Equilibrium is then re-established in the line until the water level rises again
to the level that the process starts all over again.
As with pumps, single siphons are used for systems with more than ______ linear feet of
field line and alternating siphons are used for systems with more than _______ linear feet of
field line.
500, (single)
1000, (alternating)
When installing siphons, care should be taken to assure they are installed ____________ and
are _____________________________
