OSSF INSTALLER 2 LICENSE ACTUAL TEST
PAPER 2026 COMPLETE ANSWERS
ALREADY PASSED
⩥The treatment device providing the least or poorest treatment of
domestic wastewater would be the__________________. Answer: septic
tank
⩥The disposal system that might be considered in a tight clay soil soil
would be the_______________. Answer: drip or spray irrigation
⩥Which of the following criteria would NOT be an indication that the
on-site system is working properly? Answer: Ninety-nine percent
adequate treatment is attained before wastewater reaches ground water
or surface water
⩥Adsorption is a mechanical process of soil that_______________.
Answer: will occur in water with high hardness and neutral or slightly
acidic pH
⩥The septic tank might better be termed a pretreatment process, since
more treatment occurs in the ______. Answer: soil
,⩥Standard disposal systems include all of the following
except______________. Answer: gravelless pipe (proprietary)
⩥Nonstandard disposal systems include all of the following
except______________. Answer: drip irrigation
⩥Which of the following statements regarding grease traps or
interceptors is not true? Answer: Most solids found in these structures
are settleable solids
⩥The only treatment a septic tank provides to household wastewater is
separating the settleable and floatable suspended solids from the liquid
Answer: False
⩥Current regulations for an on-site disposal system require that all
wastewater be absorbed into the soil. Answer: False
⩥A suitable soil provides only biological treatment for septic tank
effluent. Answer: False
⩥An evaluation of a lot for design and installation of a septic tank
system should include the following Answer: a. lot size
b. soil & geological conditions
c. topography and slope
, d. setbacks
e. flood hazards
⩥A very common reason for soil absorption system failures is
inadequate_________________________. Answer: lot size
⩥When systems fail in urban or suburban areas, there is a serious threat
of the spread of____________________________________. Answer:
Water born diseases
⩥Lots served by individual wells should be a minimum
of___________________ acre in size for a septic system. Answer: one
⩥Lots served by a public water supply shoild be a minumum of
_____________________acre in size for a septic system. Answer: one
half
⩥When minimum lot size cannot be met, an on-site system must be
deigned by a _______________________________or
a_________________________________. Answer: Registered
professional engineer, registered sanitarian
⩥When evaluating a topography site,_________________ and potential
for __________________ are key considerations. Answer: slope,
flooding
PAPER 2026 COMPLETE ANSWERS
ALREADY PASSED
⩥The treatment device providing the least or poorest treatment of
domestic wastewater would be the__________________. Answer: septic
tank
⩥The disposal system that might be considered in a tight clay soil soil
would be the_______________. Answer: drip or spray irrigation
⩥Which of the following criteria would NOT be an indication that the
on-site system is working properly? Answer: Ninety-nine percent
adequate treatment is attained before wastewater reaches ground water
or surface water
⩥Adsorption is a mechanical process of soil that_______________.
Answer: will occur in water with high hardness and neutral or slightly
acidic pH
⩥The septic tank might better be termed a pretreatment process, since
more treatment occurs in the ______. Answer: soil
,⩥Standard disposal systems include all of the following
except______________. Answer: gravelless pipe (proprietary)
⩥Nonstandard disposal systems include all of the following
except______________. Answer: drip irrigation
⩥Which of the following statements regarding grease traps or
interceptors is not true? Answer: Most solids found in these structures
are settleable solids
⩥The only treatment a septic tank provides to household wastewater is
separating the settleable and floatable suspended solids from the liquid
Answer: False
⩥Current regulations for an on-site disposal system require that all
wastewater be absorbed into the soil. Answer: False
⩥A suitable soil provides only biological treatment for septic tank
effluent. Answer: False
⩥An evaluation of a lot for design and installation of a septic tank
system should include the following Answer: a. lot size
b. soil & geological conditions
c. topography and slope
, d. setbacks
e. flood hazards
⩥A very common reason for soil absorption system failures is
inadequate_________________________. Answer: lot size
⩥When systems fail in urban or suburban areas, there is a serious threat
of the spread of____________________________________. Answer:
Water born diseases
⩥Lots served by individual wells should be a minimum
of___________________ acre in size for a septic system. Answer: one
⩥Lots served by a public water supply shoild be a minumum of
_____________________acre in size for a septic system. Answer: one
half
⩥When minimum lot size cannot be met, an on-site system must be
deigned by a _______________________________or
a_________________________________. Answer: Registered
professional engineer, registered sanitarian
⩥When evaluating a topography site,_________________ and potential
for __________________ are key considerations. Answer: slope,
flooding
