1
OSSF Installer 2 2026-
Comprehensive Q&A For Certification
Success
Two wastewater tests commonly used to measure the strength of sewage are the
_______ and the _____ - correct-answer -BOD and the SS
Blockage in the home plumbing system is often caused by _______, _______ and
_______ - correct-answer -Oils fats and grease
It is recommended that ____________not be used because they significantly
increase the amount of suspended solids and organic matter discharged into the
sewage disposal system - correct-answer -Garbage disposal
Wastewater containing no DO is referred to as ___________is __________, and
has _________odor . - correct-answer -Septic
Dark grayto black color
strong disagreeable
, 2
Information on boundaries and property lot size , soil conditions , and location of
existing or planned buildings is obtained during the
a . permit application
b . site evaluation
c . construction
d . installation - correct-answer -b . site evaluation
______should NOT be allowed over the OSSF treatment unit or drainfield
a . Vegetation
b . Mowing
c . Earth fill
d . Rainfall runoff - correct-answer -d . Rainfall runoff
Septic tanks must have a ____or ____compartment design . - correct-answer -2 or
3
In a two compartment system , the first tank should contain between ___to
_____of the required capacity . - correct-answer -1/2 to 2/3
, 3
The location of the treatment tank is usually determined by ____of the land and
out from the home the ________ and ______ - correct-answer -Slope of the land
and The bathroom and Kitchen
List three of the materials acceptable for the construction of treatment and pump
tanks - correct-answer -Fiberglass
Other materials approved by TECQ
Reinforced plastic polyethylene
Complete the following requirements for a house sewer .
The pipe from the house to the septic tank must have a minimum inside diameter
of no less than 3 inches .
b . The slope of the house sewer shall be no less than 1/8 fall per foot of pipe . .
The stub out location should be at the highest possible elevation with respect to
the house foundation to avoid deep septic tanks .
d . The line must be of Watertight construction
e A two way clean out plug must be provided between the building and the septic
tank .
f . All fittings should be of the Sanitary type .
g . An additional cleanout may be single type ) must be provided within 5 of every
90 ° bend and for every 50 ' of straight horizontal piping - correct-answer -a . 3
b . 1/8
c .highest.
OSSF Installer 2 2026-
Comprehensive Q&A For Certification
Success
Two wastewater tests commonly used to measure the strength of sewage are the
_______ and the _____ - correct-answer -BOD and the SS
Blockage in the home plumbing system is often caused by _______, _______ and
_______ - correct-answer -Oils fats and grease
It is recommended that ____________not be used because they significantly
increase the amount of suspended solids and organic matter discharged into the
sewage disposal system - correct-answer -Garbage disposal
Wastewater containing no DO is referred to as ___________is __________, and
has _________odor . - correct-answer -Septic
Dark grayto black color
strong disagreeable
, 2
Information on boundaries and property lot size , soil conditions , and location of
existing or planned buildings is obtained during the
a . permit application
b . site evaluation
c . construction
d . installation - correct-answer -b . site evaluation
______should NOT be allowed over the OSSF treatment unit or drainfield
a . Vegetation
b . Mowing
c . Earth fill
d . Rainfall runoff - correct-answer -d . Rainfall runoff
Septic tanks must have a ____or ____compartment design . - correct-answer -2 or
3
In a two compartment system , the first tank should contain between ___to
_____of the required capacity . - correct-answer -1/2 to 2/3
, 3
The location of the treatment tank is usually determined by ____of the land and
out from the home the ________ and ______ - correct-answer -Slope of the land
and The bathroom and Kitchen
List three of the materials acceptable for the construction of treatment and pump
tanks - correct-answer -Fiberglass
Other materials approved by TECQ
Reinforced plastic polyethylene
Complete the following requirements for a house sewer .
The pipe from the house to the septic tank must have a minimum inside diameter
of no less than 3 inches .
b . The slope of the house sewer shall be no less than 1/8 fall per foot of pipe . .
The stub out location should be at the highest possible elevation with respect to
the house foundation to avoid deep septic tanks .
d . The line must be of Watertight construction
e A two way clean out plug must be provided between the building and the septic
tank .
f . All fittings should be of the Sanitary type .
g . An additional cleanout may be single type ) must be provided within 5 of every
90 ° bend and for every 50 ' of straight horizontal piping - correct-answer -a . 3
b . 1/8
c .highest.
