Septic Installer Test for Washington State
(WOSSA) Practice Exam Questions with
All Complete Verified Detailed Correct
Solutions Latest Update 2025
Fecal coliform bacteria --- correct answer ---bacteria found in the
intestinal tracts of warm-blooded animals that are cultured in
standard tests. Generally expressed as colonies per 100 ml.
Gravely --- correct answer ---Soils with 15% or more, but less than
35% rock fragments by volume.
Gray Water --- correct answer ---Sewage from bathtubs, showers,
bathroom sinks, kitchen sinks, washing machines, and dishwashers.
Ground water --- correct answer ---Subsurface water in the zone of
saturated soils, seasonally, permanently, or as the result of the tides.
Holding tank sewage system --- correct answer ---an on-site sewage
system that a holding tank with no discharge outlet
,hydraulic loading rate --- correct answer ---the amount of effluent
applied to a given treatment step, expressed as gallons per square foot
per day, (gal./sq.ft./day)
industrial waste --- correct answer ---Waste from production of
consumer goods, mining, agriculture and petroleum extraction and
refining
Infiltrative surface --- correct answer ---Surface within a treatment
component or soil dispersal component to which effluent is applied
and through which effluent moves into original, undisturbed soil or
other porous treatment media.
Installer --- correct answer ---a person approved by the local health
office to install on-site sewage systems or components
Local Health Officer --- correct answer ---The provincial or municipal
health officer.
Maintenance --- correct answer ---The actions necessary to keep the
on-site sewage system components functioning as designed
,Massive structure --- correct answer ---the condition of a soil layer in
which the layer appears as a coherent of solid mass not separated into
peds of any kind
Moderated structure --- correct answer ---Well- formed distinct peds
evident in undisturbed soil. When disturbed, soil material parts into
mixture of whole peds, broken peds, and material that is not in peds.
Monitoring --- correct answer ---Periodic or continuous surveillance
of on-site sewage system, which is performed by observations and
measurements, to determine if the system is functioning as intended
and if system is in need of maintenance.
On-site sewage system (OSS) --- correct answer ---An integrated
system of components , located on or nearby the property it serves.
that conveys, stores, treats, and/or provides subsurface soil treatment
and dispersal of sewage. It consists of a collection system, a treatment
component or treatment sequence, and a soil dispersal component.
Operating capacity --- correct answer ---the average daily volume of
sewage an OSS can treat and disperse on a sustained basis. The
operating capacity, which is lower than design flow, is an integral
part of the design and is used as an index in OSS monitoring.
, Ordinary High Water Mark --- correct answer ---The point on the bank
or shore where water is present often enough so that the upland
begins to look different from the lake or stream bed.
Ped --- correct answer ---a unit of soil structure such as blocks,
columns, granule, plate or prism formed by natural process
Person --- correct answer ---Any individual, partnership, corporation,
association, government or governmental subdivision or agency or
other entity:
Planned Unit Development --- correct answer ---A planned
combination of diverse land uses, such as housing, recreation, and
shopping, in one contained development or subdivision.
Platy structure --- correct answer ---Thin, flat plates of soil that lie
horizontally. Usually found in compacted soil. This type of soil will
impede the vertical movement of water.
Pressure distribution --- correct answer ---a system of small diameter
pipes equally distributing effluent throughout a SASS. Can include a
drip system
(WOSSA) Practice Exam Questions with
All Complete Verified Detailed Correct
Solutions Latest Update 2025
Fecal coliform bacteria --- correct answer ---bacteria found in the
intestinal tracts of warm-blooded animals that are cultured in
standard tests. Generally expressed as colonies per 100 ml.
Gravely --- correct answer ---Soils with 15% or more, but less than
35% rock fragments by volume.
Gray Water --- correct answer ---Sewage from bathtubs, showers,
bathroom sinks, kitchen sinks, washing machines, and dishwashers.
Ground water --- correct answer ---Subsurface water in the zone of
saturated soils, seasonally, permanently, or as the result of the tides.
Holding tank sewage system --- correct answer ---an on-site sewage
system that a holding tank with no discharge outlet
,hydraulic loading rate --- correct answer ---the amount of effluent
applied to a given treatment step, expressed as gallons per square foot
per day, (gal./sq.ft./day)
industrial waste --- correct answer ---Waste from production of
consumer goods, mining, agriculture and petroleum extraction and
refining
Infiltrative surface --- correct answer ---Surface within a treatment
component or soil dispersal component to which effluent is applied
and through which effluent moves into original, undisturbed soil or
other porous treatment media.
Installer --- correct answer ---a person approved by the local health
office to install on-site sewage systems or components
Local Health Officer --- correct answer ---The provincial or municipal
health officer.
Maintenance --- correct answer ---The actions necessary to keep the
on-site sewage system components functioning as designed
,Massive structure --- correct answer ---the condition of a soil layer in
which the layer appears as a coherent of solid mass not separated into
peds of any kind
Moderated structure --- correct answer ---Well- formed distinct peds
evident in undisturbed soil. When disturbed, soil material parts into
mixture of whole peds, broken peds, and material that is not in peds.
Monitoring --- correct answer ---Periodic or continuous surveillance
of on-site sewage system, which is performed by observations and
measurements, to determine if the system is functioning as intended
and if system is in need of maintenance.
On-site sewage system (OSS) --- correct answer ---An integrated
system of components , located on or nearby the property it serves.
that conveys, stores, treats, and/or provides subsurface soil treatment
and dispersal of sewage. It consists of a collection system, a treatment
component or treatment sequence, and a soil dispersal component.
Operating capacity --- correct answer ---the average daily volume of
sewage an OSS can treat and disperse on a sustained basis. The
operating capacity, which is lower than design flow, is an integral
part of the design and is used as an index in OSS monitoring.
, Ordinary High Water Mark --- correct answer ---The point on the bank
or shore where water is present often enough so that the upland
begins to look different from the lake or stream bed.
Ped --- correct answer ---a unit of soil structure such as blocks,
columns, granule, plate or prism formed by natural process
Person --- correct answer ---Any individual, partnership, corporation,
association, government or governmental subdivision or agency or
other entity:
Planned Unit Development --- correct answer ---A planned
combination of diverse land uses, such as housing, recreation, and
shopping, in one contained development or subdivision.
Platy structure --- correct answer ---Thin, flat plates of soil that lie
horizontally. Usually found in compacted soil. This type of soil will
impede the vertical movement of water.
Pressure distribution --- correct answer ---a system of small diameter
pipes equally distributing effluent throughout a SASS. Can include a
drip system
