Septic License Exam 2025–2026 Accurate Real
Exam Questions and Verified Correct Answers
when constructing an evaporation/absorption lagoon where berm walls should be
keyed into original soil at least 1 foot deep + 2 foot wide at base
true
what types of trench barrier material is approved?
a. 4 inch layer whole straw
b. synthetic fabric
c. roofing felt
d. plastic sheeting
e. both a + b
f. all above
e. both a + b
a. 4 inch layer whole straw
b. synthetic fabric
drip irrigation is experimental onsite sewage disposable system option
false
Septic tanks are required to have all seams and drain holes sealed to make water tight.
true
reduction of lateral footage for 16 foot wide gravel bed
a. 55%
b. same as leeching chambers
c. same as 12 foot wide gravel bed
d. 32%
c. same as 12 foot wide gravel bed
,holding tanks required to have alarm to trigger when tank is how full?
a. 95%
b. 90%
c. 85%
d. 75%
c. 85%
1.6 gallon or less flush commodes are required on facilities that use holding tanks
true
dosing tanks are required to have separate electrical circuits for pump + alarm
true
mercury flow switches not allowed to be used on dosing pumps
false
when alternating lateral fields are installed what percentage of lateral field should be
installed on each side of alternating valve?
a. 60% on one side + 40% other
b. 100% with other side capped off for later repairs
c. no set % for side
d. 50% on each
d. 50% on each
on sites where curtain drains are needed, the curtain drain must be installed to obtain
final system approval
true
your shipment of trench rock has just been delivered on site. inspection of rock reveals
fine material is mixed in with it. what do you do?
a. send load back to quarry
b. wash rock prior to installation to remove fine material
c. install gravel in trenches + wash
, d. install rock without washing
e. either a or b
e. either a or b
a. send load back to quarry
b. wash rock prior to instillation to remove fine material
your shipment of trench rock has just been delivered to construction site. inspection
reveals #9 stone was shipped. is this acceptable?
no
hole type perforated piping is acceptable to use in both curtain drains + lateral trenches
false
car washes, slaughter houses, factories, funeral parlors can produce waste that are not
allowed to be disposed in an on site sewage disposable system
true
which of following special design requirements on high clay, group 4 sites?
a. 2 septic tank in series
b. separate laundry, gray water beds with no primary system size reduction
c. alternate lateral fields
d. dosing
e. all above
e. all above
a. 2 septic tank in series
b. separate laundry, gray water beds with no primary system size reduction
c. alternate lateral fields
d. dosing
which type of soil requires most lateral field?
a. group 1
b. group 2
Exam Questions and Verified Correct Answers
when constructing an evaporation/absorption lagoon where berm walls should be
keyed into original soil at least 1 foot deep + 2 foot wide at base
true
what types of trench barrier material is approved?
a. 4 inch layer whole straw
b. synthetic fabric
c. roofing felt
d. plastic sheeting
e. both a + b
f. all above
e. both a + b
a. 4 inch layer whole straw
b. synthetic fabric
drip irrigation is experimental onsite sewage disposable system option
false
Septic tanks are required to have all seams and drain holes sealed to make water tight.
true
reduction of lateral footage for 16 foot wide gravel bed
a. 55%
b. same as leeching chambers
c. same as 12 foot wide gravel bed
d. 32%
c. same as 12 foot wide gravel bed
,holding tanks required to have alarm to trigger when tank is how full?
a. 95%
b. 90%
c. 85%
d. 75%
c. 85%
1.6 gallon or less flush commodes are required on facilities that use holding tanks
true
dosing tanks are required to have separate electrical circuits for pump + alarm
true
mercury flow switches not allowed to be used on dosing pumps
false
when alternating lateral fields are installed what percentage of lateral field should be
installed on each side of alternating valve?
a. 60% on one side + 40% other
b. 100% with other side capped off for later repairs
c. no set % for side
d. 50% on each
d. 50% on each
on sites where curtain drains are needed, the curtain drain must be installed to obtain
final system approval
true
your shipment of trench rock has just been delivered on site. inspection of rock reveals
fine material is mixed in with it. what do you do?
a. send load back to quarry
b. wash rock prior to installation to remove fine material
c. install gravel in trenches + wash
, d. install rock without washing
e. either a or b
e. either a or b
a. send load back to quarry
b. wash rock prior to instillation to remove fine material
your shipment of trench rock has just been delivered to construction site. inspection
reveals #9 stone was shipped. is this acceptable?
no
hole type perforated piping is acceptable to use in both curtain drains + lateral trenches
false
car washes, slaughter houses, factories, funeral parlors can produce waste that are not
allowed to be disposed in an on site sewage disposable system
true
which of following special design requirements on high clay, group 4 sites?
a. 2 septic tank in series
b. separate laundry, gray water beds with no primary system size reduction
c. alternate lateral fields
d. dosing
e. all above
e. all above
a. 2 septic tank in series
b. separate laundry, gray water beds with no primary system size reduction
c. alternate lateral fields
d. dosing
which type of soil requires most lateral field?
a. group 1
b. group 2
