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OSSF INSTALLER 2 LICENSE EXAM
ACTUAL QUESTIONS 2026 WITH
VERIFIED ANSWERS.
The minimum soil requirements for leaching chambers or
gravelless pipe systems following a septic tank are
A. 2 ft . of Class Ib , II , or III soil below the field bottom
B. the same as for a standard absorptive drainfield
C. 4 ft . of permeable soil with no more than seasonable
saturation
D. both a and b - correct answer-D both a and b
OSSF surface application always requires
a . at least primary treatment and disinfection
b . at least secondary treatment and disinfection
c . primary treatment and disinfection or secondary treatment
atenti
d . tertiary treatment bvad - correct answer-b . at least
secondary treatment and disinfection
vision Why is surface application often selected over other
OSSF disposal options ?
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a . Small lots diw it
b . The lake front setback for waterfront property assage
nonsollege
c . Clay soils and / or seasonal groundwater problems qb
d . The irrigation water available for vegetable gardens or
orchards - correct answer-c . Clay soils and / or seasonal
groundwater problems
Which of the following is required to determine the size of spray
area required for an OSSF spray irrigation system ?
a . soil R , in gal./ft.2/day and Q in gal./min .
b . Q in gal./day and aerobic plant capacity to
c . rate of irrigation ( R ) allowed in that area and ( Q ) in
gal./day
D. maximum aerobic plant capacity and the soil acceptance
tance rate rate ( R₂ ) - correct answer-c . rate of irrigation ( R )
allowed in that area and ( Q ) in gal./day
Which systems routinely require a pump tank ?
a . LPD and leaching chambers
b . Gravelless pipe , sand filters and LPD
c. Surface and drip irrigation and sand filters
d . Drip irrigation and standard absorptive drainfields - correct
answer-c . Surface and drip irrigation and sand filters
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The setback from a public water well for an aerobic plant is
a . 50 feet
b . 100 feet
c . 150 feet
d . determined based upon slope percent - correct answer-A.50
A legal maintenance company for a surface application OSSF
system using proprietary aerobic plant must have an employee
who is which of the following ?
a . A licensed maintenance provider b . A registered
maintenance technician
c . A registered installer and maintenance technician
d . A registered installer or class D wastewater operator -
correct answer-a . A licensed maintenance provider
Which OSSF disposal systems are routinely required to have
maintenance contracts ?
a . LPD mounds and lined ETs
b . Sand filters with LPD disposal c.LPD and surface application
systems
d . Surface and subsurface drip irrigation - correct answer-d .
Surface and subsurface drip irrigation
OSSF INSTALLER 2 LICENSE EXAM
ACTUAL QUESTIONS 2026 WITH
VERIFIED ANSWERS.
The minimum soil requirements for leaching chambers or
gravelless pipe systems following a septic tank are
A. 2 ft . of Class Ib , II , or III soil below the field bottom
B. the same as for a standard absorptive drainfield
C. 4 ft . of permeable soil with no more than seasonable
saturation
D. both a and b - correct answer-D both a and b
OSSF surface application always requires
a . at least primary treatment and disinfection
b . at least secondary treatment and disinfection
c . primary treatment and disinfection or secondary treatment
atenti
d . tertiary treatment bvad - correct answer-b . at least
secondary treatment and disinfection
vision Why is surface application often selected over other
OSSF disposal options ?
, Page | 2
a . Small lots diw it
b . The lake front setback for waterfront property assage
nonsollege
c . Clay soils and / or seasonal groundwater problems qb
d . The irrigation water available for vegetable gardens or
orchards - correct answer-c . Clay soils and / or seasonal
groundwater problems
Which of the following is required to determine the size of spray
area required for an OSSF spray irrigation system ?
a . soil R , in gal./ft.2/day and Q in gal./min .
b . Q in gal./day and aerobic plant capacity to
c . rate of irrigation ( R ) allowed in that area and ( Q ) in
gal./day
D. maximum aerobic plant capacity and the soil acceptance
tance rate rate ( R₂ ) - correct answer-c . rate of irrigation ( R )
allowed in that area and ( Q ) in gal./day
Which systems routinely require a pump tank ?
a . LPD and leaching chambers
b . Gravelless pipe , sand filters and LPD
c. Surface and drip irrigation and sand filters
d . Drip irrigation and standard absorptive drainfields - correct
answer-c . Surface and drip irrigation and sand filters
, Page | 3
The setback from a public water well for an aerobic plant is
a . 50 feet
b . 100 feet
c . 150 feet
d . determined based upon slope percent - correct answer-A.50
A legal maintenance company for a surface application OSSF
system using proprietary aerobic plant must have an employee
who is which of the following ?
a . A licensed maintenance provider b . A registered
maintenance technician
c . A registered installer and maintenance technician
d . A registered installer or class D wastewater operator -
correct answer-a . A licensed maintenance provider
Which OSSF disposal systems are routinely required to have
maintenance contracts ?
a . LPD mounds and lined ETs
b . Sand filters with LPD disposal c.LPD and surface application
systems
d . Surface and subsurface drip irrigation - correct answer-d .
Surface and subsurface drip irrigation
