SEPTIC LICENSE INSTALLER COMPLETE EXAM QUESTIONS
WITH CORRECT ANSWERS 2025/2026
Septic tanks are required to have all seams and drain holes sealed to make water tight. -
CORRECT ANSWER -true
all pretreatment units + distribution boxes are required to have KY approval numbers on them -
CORRECT ANSWER -true
equal-flow type distribution boxes may be installed on tamped sand or gravel - CORRECT
ANSWER -true
highest hole in hill side box does not have to be connected to inlet pipe - CORRECT ANSWER -
false
all distribution boxes shall be installed level - CORRECT ANSWER -true
certified installer must lay out a septic system prior to evacuation to assure that adequate fall
between components is possible - CORRECT ANSWER -true
equipment used in constructing aseptic system should be:
a. as heavy as possible to maximize soil compaction
b. as light as possible to minimize soil compaction
c. equipment weight does not matter - CORRECT ANSWER -b. as light as possible to minimize
soil compaction
the minimum lateral trench depth is 24 inches - CORRECT ANSWER -false
,soil + site conditions limit which type of on site sewage disposal system will work on a site -
CORRECT ANSWER -true
primary purpose of septic tank is to remove solids thru sewage thru settling - CORRECT ANSWER
-true
soil structure indicates amount of large pore spaces in soil, which are important to absorb
sewage effluent from the lateral lines - CORRECT ANSWER -true
gray water systems contain discharge from these fixtures - CORRECT ANSWER -laundry, hand
wash sink, shower, bathtubs, laundry tubs
what is not considered gray water?
laundry, hand wash sink, shower, bathtubs, laundry tubs, food prep sink, kitchen sink - CORRECT
ANSWER -food prep sink + kitchen sink
slopes greater than 15% may be unstable when on-site sewage disposable systems installed on
them unless special designs modifications made - CORRECT ANSWER -true
what natural process removes most of sewage effluent from lateral trench?
a. evaporation
b. gravity flow
c. bacterial action
d. uptake by trees + grass - CORRECT ANSWER -b. gravity flow
seasonal water tables can be identified in dry months by
a. orange + red colors in soil
b. direct presence of water in soil when sampled
, c. gray, green, blue or black colors in soil
d. presence of large flag stones
e. all above - CORRECT ANSWER -c. gray, green, blue or black colors in soil
certified installer must submit proposed system drawing prior to obtaining instillation permit -
CORRECT ANSWER -true
certified installer must lay out on site sewage system to determine if adequate fall is possible
between components - CORRECT ANSWER -true
you obtain permit to install system with lateral trenches no deeper than 10 inches. if home
builder tells you that they do not want septic tank leaving hump in yard. what do you do?
a. bury tank deep enough in ground so no hump
b. install low profile septic tank
c. install regular septic tank + add fill soil dirt around tank so no hump left when yard is graded
d. either b or c - CORRECT ANSWER -d. both b + c = install low profile septic tank or
install regular septic tank + add fill soil dirt around tank so no hump left when yard is graded
wire test is
a. test to determine if electrical wiring properly installed
b. test to determine whether lateral lines installed level
c. field test to determine if soil moisture will cause damage during lateral line excavation
d. all above - CORRECT ANSWER -c. field test to determine if soil moisture will cause damage
during lateral line excavation
maximum length for individual conventional lateral trench is
a. 100 feet
WITH CORRECT ANSWERS 2025/2026
Septic tanks are required to have all seams and drain holes sealed to make water tight. -
CORRECT ANSWER -true
all pretreatment units + distribution boxes are required to have KY approval numbers on them -
CORRECT ANSWER -true
equal-flow type distribution boxes may be installed on tamped sand or gravel - CORRECT
ANSWER -true
highest hole in hill side box does not have to be connected to inlet pipe - CORRECT ANSWER -
false
all distribution boxes shall be installed level - CORRECT ANSWER -true
certified installer must lay out a septic system prior to evacuation to assure that adequate fall
between components is possible - CORRECT ANSWER -true
equipment used in constructing aseptic system should be:
a. as heavy as possible to maximize soil compaction
b. as light as possible to minimize soil compaction
c. equipment weight does not matter - CORRECT ANSWER -b. as light as possible to minimize
soil compaction
the minimum lateral trench depth is 24 inches - CORRECT ANSWER -false
,soil + site conditions limit which type of on site sewage disposal system will work on a site -
CORRECT ANSWER -true
primary purpose of septic tank is to remove solids thru sewage thru settling - CORRECT ANSWER
-true
soil structure indicates amount of large pore spaces in soil, which are important to absorb
sewage effluent from the lateral lines - CORRECT ANSWER -true
gray water systems contain discharge from these fixtures - CORRECT ANSWER -laundry, hand
wash sink, shower, bathtubs, laundry tubs
what is not considered gray water?
laundry, hand wash sink, shower, bathtubs, laundry tubs, food prep sink, kitchen sink - CORRECT
ANSWER -food prep sink + kitchen sink
slopes greater than 15% may be unstable when on-site sewage disposable systems installed on
them unless special designs modifications made - CORRECT ANSWER -true
what natural process removes most of sewage effluent from lateral trench?
a. evaporation
b. gravity flow
c. bacterial action
d. uptake by trees + grass - CORRECT ANSWER -b. gravity flow
seasonal water tables can be identified in dry months by
a. orange + red colors in soil
b. direct presence of water in soil when sampled
, c. gray, green, blue or black colors in soil
d. presence of large flag stones
e. all above - CORRECT ANSWER -c. gray, green, blue or black colors in soil
certified installer must submit proposed system drawing prior to obtaining instillation permit -
CORRECT ANSWER -true
certified installer must lay out on site sewage system to determine if adequate fall is possible
between components - CORRECT ANSWER -true
you obtain permit to install system with lateral trenches no deeper than 10 inches. if home
builder tells you that they do not want septic tank leaving hump in yard. what do you do?
a. bury tank deep enough in ground so no hump
b. install low profile septic tank
c. install regular septic tank + add fill soil dirt around tank so no hump left when yard is graded
d. either b or c - CORRECT ANSWER -d. both b + c = install low profile septic tank or
install regular septic tank + add fill soil dirt around tank so no hump left when yard is graded
wire test is
a. test to determine if electrical wiring properly installed
b. test to determine whether lateral lines installed level
c. field test to determine if soil moisture will cause damage during lateral line excavation
d. all above - CORRECT ANSWER -c. field test to determine if soil moisture will cause damage
during lateral line excavation
maximum length for individual conventional lateral trench is
a. 100 feet
