OSSF INSTALLER 1 EXAM EVALUATION TEST 2025/2026
QUESTIONS AND ANSWERS GRADED A++
✔✔When evaluating a topography site _________and potential for ________are key
considerations - ✔✔Slope floodind
✔✔A major reason for wastewater system failure is
a homeowner waste
b . inadequate planning
c . hydraulic overloading
d . oils grease and fats - ✔✔c . hydraulic overloading grease
✔✔The size of OSSF systems are normally based upon the
a . lot size
b . soil profile
c . hydraulic loading
d . homeowner's preference - ✔✔c . hydraulic loading
✔✔Some malfunctioning OSSF systems can be made to function properly with minimal
cost by implementing - ✔✔Water
✔✔The first step in reducing the wastewater load is - ✔✔Elimination of leaks
✔✔List four water - saving plumbing devices that can be used in a home - ✔✔Reduce
flow shower head
Faucet aerators
Reduce flow faucet
Pressure reducinh valves
✔✔Identify four water saving living habits homeowners should adopt - ✔✔Waiting for
full loads before running clothes or dishwashers
Not using the toilet to dispose of trash such a cigarette butts tissue paper or sanitary
napkins
Not leaving the faucet running when shaving or brushing teeth
Reducing or eliminating the use of garbage disposals
✔✔The value of Q - ✔✔Quantity of sewage (gallons/day)
✔✔Two wastewater tests commonly used to measure the strength of sewage are the
_______ and the _____ - ✔✔BOD and the SS
✔✔Blockage in the home plumbing system is often caused by _______, _______ and
_______ - ✔✔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 - ✔✔Garbage disposal
✔✔Wastewater containing no DO is referred to as ___________is __________, and
has _________odor . - ✔✔Septic
Dark grayto black color
strong disagreeable
✔✔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 - ✔✔b . site evaluation
✔✔______should NOT be allowed over the OSSF treatment unit or drainfield
a . Vegetation
b . Mowing
c . Earth fill
d . Rainfall runoff - ✔✔d . Rainfall runoff
✔✔Septic tanks must have a ____or ____compartment design . - ✔✔2 or 3
✔✔In a two compartment system , the first tank should contain between ___to _____of
the required capacity . - ✔✔1/2 to 2/3
✔✔The location of the treatment tank is usually determined by ____of the land and out
from the home the ________ and ______ - ✔✔Slope of the land and The bathroom and
Kitchen
✔✔List three of the materials acceptable for the construction of treatment and pump
tanks - ✔✔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 .
QUESTIONS AND ANSWERS GRADED A++
✔✔When evaluating a topography site _________and potential for ________are key
considerations - ✔✔Slope floodind
✔✔A major reason for wastewater system failure is
a homeowner waste
b . inadequate planning
c . hydraulic overloading
d . oils grease and fats - ✔✔c . hydraulic overloading grease
✔✔The size of OSSF systems are normally based upon the
a . lot size
b . soil profile
c . hydraulic loading
d . homeowner's preference - ✔✔c . hydraulic loading
✔✔Some malfunctioning OSSF systems can be made to function properly with minimal
cost by implementing - ✔✔Water
✔✔The first step in reducing the wastewater load is - ✔✔Elimination of leaks
✔✔List four water - saving plumbing devices that can be used in a home - ✔✔Reduce
flow shower head
Faucet aerators
Reduce flow faucet
Pressure reducinh valves
✔✔Identify four water saving living habits homeowners should adopt - ✔✔Waiting for
full loads before running clothes or dishwashers
Not using the toilet to dispose of trash such a cigarette butts tissue paper or sanitary
napkins
Not leaving the faucet running when shaving or brushing teeth
Reducing or eliminating the use of garbage disposals
✔✔The value of Q - ✔✔Quantity of sewage (gallons/day)
✔✔Two wastewater tests commonly used to measure the strength of sewage are the
_______ and the _____ - ✔✔BOD and the SS
✔✔Blockage in the home plumbing system is often caused by _______, _______ and
_______ - ✔✔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 - ✔✔Garbage disposal
✔✔Wastewater containing no DO is referred to as ___________is __________, and
has _________odor . - ✔✔Septic
Dark grayto black color
strong disagreeable
✔✔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 - ✔✔b . site evaluation
✔✔______should NOT be allowed over the OSSF treatment unit or drainfield
a . Vegetation
b . Mowing
c . Earth fill
d . Rainfall runoff - ✔✔d . Rainfall runoff
✔✔Septic tanks must have a ____or ____compartment design . - ✔✔2 or 3
✔✔In a two compartment system , the first tank should contain between ___to _____of
the required capacity . - ✔✔1/2 to 2/3
✔✔The location of the treatment tank is usually determined by ____of the land and out
from the home the ________ and ______ - ✔✔Slope of the land and The bathroom and
Kitchen
✔✔List three of the materials acceptable for the construction of treatment and pump
tanks - ✔✔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 .
