OSSF INSTALLER 2 LICENSE EXAM 2026
QUESTIONS AND ANSWERS GRADED A+
100% VERIFIED
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.
d . Watertight
e . clean out septic
f . Sanitary
g . 5 and 50 '
The size of any drainfield is dependent on what two factors ? - Correct Answer -
Sewage bading or volume in gallons day = a Long term soil acceptance rate
determined by Class
Complete the following requirements for a standard absorptive drainfield
a . Minimum depth is ___" inches .
b . Minimum separation between drainfield excavations is ____' feet .
c . In most cases , the maximum drainfield depth is _____' feet .
d . The porous media most commonly used is _______gravel . - Correct Answer -a
. Minimum 18 "
b.3'
c . In '
, d . The Clean Gravel
A ____________of __________shall be placed on top op the porous media before
backfilling - Correct Answer -Permeable barrier geo fabric
The backfill above the barrier and gravel should be type ______,______ or
_____soil . - Correct Answer -1b,11 or 11
Which of the following is true of aerobic treatment plants ?
a . Able to maintain a minimum DO of 4.0 mg / L
b . Odor free , utilize aerobic bacteria and produce hydrogen sulfide gas .
c. Use aerobic bacteria and oxygen to breakdown complex organics and produce
carbon dioxide
d . Use aerobic bacteria and carbon dioxide to produce complex organic
compounds and natural gas - Correct Answer -c . Use aerobic bacteria and oxygen
to breakdown complex organics and produce carbon dioxide
To determine if a proprietary aerobic treatment plant is appropriate for use with
surface application disposal it must
a . be on the TCEQ's most recently approved list
b . be able to maintain a minimum DO of 4.0 mg / L
QUESTIONS AND ANSWERS GRADED A+
100% VERIFIED
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.
d . Watertight
e . clean out septic
f . Sanitary
g . 5 and 50 '
The size of any drainfield is dependent on what two factors ? - Correct Answer -
Sewage bading or volume in gallons day = a Long term soil acceptance rate
determined by Class
Complete the following requirements for a standard absorptive drainfield
a . Minimum depth is ___" inches .
b . Minimum separation between drainfield excavations is ____' feet .
c . In most cases , the maximum drainfield depth is _____' feet .
d . The porous media most commonly used is _______gravel . - Correct Answer -a
. Minimum 18 "
b.3'
c . In '
, d . The Clean Gravel
A ____________of __________shall be placed on top op the porous media before
backfilling - Correct Answer -Permeable barrier geo fabric
The backfill above the barrier and gravel should be type ______,______ or
_____soil . - Correct Answer -1b,11 or 11
Which of the following is true of aerobic treatment plants ?
a . Able to maintain a minimum DO of 4.0 mg / L
b . Odor free , utilize aerobic bacteria and produce hydrogen sulfide gas .
c. Use aerobic bacteria and oxygen to breakdown complex organics and produce
carbon dioxide
d . Use aerobic bacteria and carbon dioxide to produce complex organic
compounds and natural gas - Correct Answer -c . Use aerobic bacteria and oxygen
to breakdown complex organics and produce carbon dioxide
To determine if a proprietary aerobic treatment plant is appropriate for use with
surface application disposal it must
a . be on the TCEQ's most recently approved list
b . be able to maintain a minimum DO of 4.0 mg / L
