1|Page
Septic Installer License Test 2025 Latest Practice
Test Bank With 380 Approved Questions with
Correct Answers/ Septic License Exam Prep %
Correctly Answered Questions/ Sewage System
Installer Test
ANSI - ...ANSWER...✓✓ American National Standards
Institute
BOD - ...ANSWER...✓✓ biochemical oxygen demand,
typically expressed in mg/L.
CBOD - ...ANSWER...✓✓ Carbonaceous Biochemical
Oxygen Demand, expressed in mg/L.
FC - ...ANSWER...✓✓ Fecal Coliform, expressed in
number of colonies 100/ml.
LOSS - ...ANSWER...✓✓ large on-site sewage system
NSF - ...ANSWER...✓✓ Nation Sanitation Foundation
International
,2|Page
O&G - ...ANSWER...✓✓ Oils and Grease, component of
sewage typically originating from food stuffs (animal fats
of vegetable oils) expressed in mg/L.
RS&G - ...ANSWER...✓✓ Recommended Standards and
Guidance
SSAS - ...ANSWER...✓✓ a subsurface soil absorption
system
TAC - ...ANSWER...✓✓ Technical Advisory Committee
established in WAC 247-272A-0400
TN - ...ANSWER...✓✓ Total Nitrogen, expressed in mg/L.
TSS - ...ANSWER...✓✓ Total Suspended Solids. A measure
of the total suspended solids in a given solution,
expressed in mg/L.
USEPA - ...ANSWER...✓✓ United States Environmental
Protection Agency
,3|Page
Additive - ...ANSWER...✓✓ a commercial product added to
an on-site sewage system intended to affect the
performance or aesthetics of an on-site sewage system
Approved - ...ANSWER...✓✓ Acceptable to the authority
having jurisdiction. Local health officer or the department
BED - ...ANSWER...✓✓ a soil dispersal component
consisting of an excavation with a width greater than 3
feet
Building Sewer - ...ANSWER...✓✓ that part of the
horizontal piping of a drainage system which starts from
the end of the building drain and which receives the
discharge of the building drain and conveys it to a public
sewer, private sewer, individual sewage disposal system
or other point of disposal. It begins two feet outside the
building wall and conveys sewage from the building drain
to the remaining portions of the on-site sewage system.
Cesspool - ...ANSWER...✓✓ a covered hole or pit for
receiving drainage or sewage, as from a house allowing
liquid to seep into the surronding rock or soil
, 4|Page
Conforming System - ...ANSWER...✓✓ an on-site sewage
system of component meeting rules of: New construction
requirements
Approved and installed within previous requirements
Permitted by WAC-246-272A-0420
Cover Material - ...ANSWER...✓✓ Soil placed over
dispersal component, made up of mineral material with
no greater than 10% organic content. Cover may contain
organic surface material, an organic landscaper to help
reduce and contain soil erosion.
Cuts and Banks - ...ANSWER...✓✓ a naturally occurring
or artificially formed slope greater than one hundred
percent (forty-five degrees) and extending vertically at
least five from the toe of the slope to top of the slope.
Department - ...ANSWER...✓✓ Washington State
Department of Health
Designer - ...ANSWER...✓✓ Person who matches site and
soil characteristics with approved components
Septic Installer License Test 2025 Latest Practice
Test Bank With 380 Approved Questions with
Correct Answers/ Septic License Exam Prep %
Correctly Answered Questions/ Sewage System
Installer Test
ANSI - ...ANSWER...✓✓ American National Standards
Institute
BOD - ...ANSWER...✓✓ biochemical oxygen demand,
typically expressed in mg/L.
CBOD - ...ANSWER...✓✓ Carbonaceous Biochemical
Oxygen Demand, expressed in mg/L.
FC - ...ANSWER...✓✓ Fecal Coliform, expressed in
number of colonies 100/ml.
LOSS - ...ANSWER...✓✓ large on-site sewage system
NSF - ...ANSWER...✓✓ Nation Sanitation Foundation
International
,2|Page
O&G - ...ANSWER...✓✓ Oils and Grease, component of
sewage typically originating from food stuffs (animal fats
of vegetable oils) expressed in mg/L.
RS&G - ...ANSWER...✓✓ Recommended Standards and
Guidance
SSAS - ...ANSWER...✓✓ a subsurface soil absorption
system
TAC - ...ANSWER...✓✓ Technical Advisory Committee
established in WAC 247-272A-0400
TN - ...ANSWER...✓✓ Total Nitrogen, expressed in mg/L.
TSS - ...ANSWER...✓✓ Total Suspended Solids. A measure
of the total suspended solids in a given solution,
expressed in mg/L.
USEPA - ...ANSWER...✓✓ United States Environmental
Protection Agency
,3|Page
Additive - ...ANSWER...✓✓ a commercial product added to
an on-site sewage system intended to affect the
performance or aesthetics of an on-site sewage system
Approved - ...ANSWER...✓✓ Acceptable to the authority
having jurisdiction. Local health officer or the department
BED - ...ANSWER...✓✓ a soil dispersal component
consisting of an excavation with a width greater than 3
feet
Building Sewer - ...ANSWER...✓✓ that part of the
horizontal piping of a drainage system which starts from
the end of the building drain and which receives the
discharge of the building drain and conveys it to a public
sewer, private sewer, individual sewage disposal system
or other point of disposal. It begins two feet outside the
building wall and conveys sewage from the building drain
to the remaining portions of the on-site sewage system.
Cesspool - ...ANSWER...✓✓ a covered hole or pit for
receiving drainage or sewage, as from a house allowing
liquid to seep into the surronding rock or soil
, 4|Page
Conforming System - ...ANSWER...✓✓ an on-site sewage
system of component meeting rules of: New construction
requirements
Approved and installed within previous requirements
Permitted by WAC-246-272A-0420
Cover Material - ...ANSWER...✓✓ Soil placed over
dispersal component, made up of mineral material with
no greater than 10% organic content. Cover may contain
organic surface material, an organic landscaper to help
reduce and contain soil erosion.
Cuts and Banks - ...ANSWER...✓✓ a naturally occurring
or artificially formed slope greater than one hundred
percent (forty-five degrees) and extending vertically at
least five from the toe of the slope to top of the slope.
Department - ...ANSWER...✓✓ Washington State
Department of Health
Designer - ...ANSWER...✓✓ Person who matches site and
soil characteristics with approved components
