Onsite Sewage System Installer –
Conventional EXAM STUDY GUIDE
2026/2027 ACCURATE QUESTIONS WITH
CORRECT DETAILED SOLUTIONS ||
100% GUARANTEED PASS
<NEWEST VERSION>
1. On-site sewage system - ANSWER ✔ A system for treating and disposing
of wastewater from a single property, typically involving a septic tank and
soil absorption system.
2. Grease traps - ANSWER ✔ Devices used to intercept and retain grease and
solids from wastewater before they enter the sewage system.
3. Soil absorption system - ANSWER ✔ A component of an on-site sewage
system that allows treated wastewater to be absorbed into the soil.
4. Permit requirements for sewage systems - ANSWER ✔ A permit is
generally required for the installation of an on-site sewage system by a
homeowner.
5. Treatment chamber necessity - ANSWER ✔ A treatment chamber is
necessary prior to soil absorption to ensure proper treatment of wastewater.
6. Criteria for selecting OSSF system - ANSWER ✔ The most important
criteria is to select a system that functions properly.
7. Components to be removed from wastewater - ANSWER ✔ Settleable
solids and grease must be removed from the wastewater for a soil absorption
system to operate effectively.
,8. Application for a permit - ANSWER ✔ Name and address of property
owner, location, type of facility to be served, type of water supply, number
of bedrooms and or est gallons of sewage flow per day, soil information.
9. Additional information for permits - ANSWER ✔ location of trash pits,
water supply lines, utility lines, proposed swimming pools, out buildings,
driveways or other paved areas, and any other features that may affect the
suitability of the site.
10.Facility with occupancy of two hours or more. - ANSWER ✔ Must provide
an approved on-site sewage management system. All wastewater generated
from a facility including washing machine water must be disposed of in an
approved system. Pit privies are an acceptable means of sewage disposal for
a facility not served by water under pressure.
11.Repairs, replacements, additions to existing system - ANSWER ✔ Must be
permitted and inspected, if pumping the septic tank is required, this must be
performed by a licensed sewage removal contractor in accordance with the
regulations.
12.After having completed the application process, - ANSWER ✔ A site
inspection is conducted.
13.What the inspector considers on the application. - ANSWER ✔ House
location, soil characteristics, absorption rates, ground water conditions, rock
conditions, lay of the land, bodies of water, streams and other factors which
affect the suitability of the lot.
14.Approved permit will - ANSWER ✔ include the minimum requirements
for the septic system.
All tanks must have: - ANSWER ✔ 2 compartments
15.All tanks whether pre-manufactured or constructed on site shall be
constructed so that the length is ___________ compared to the width. -
ANSWER ✔ at least one and one- half (1 1/2) times... "to the width."
16.Septic Tanks may be made of: - ANSWER ✔ Concrete, Plastic, fiberglass,
or other materials as approved by the department.
,17.Tank compartment partitions will be located: - ANSWER ✔ Not less than
two-thirds or more than three-fourths the Length of the tank from the Inlet
end.
18.Compartment partitions will be constructed so a pass-thru hole or slot equal
to or greater than the diameter of the inlet pipe is positioned below the liquid
surface with a _____________________________. - ANSWER ✔
Minimum 25% to a maximum of 50% of the total liquid depth.
19.Total liquid depth for larger poured-in-place tanks shall have a maximum of
______________inches - ANSWER ✔ 66 inches
20.True or False: Walls and bottom of poured-in-place septic tanks must be
reinforced. - ANSWER ✔ True
21.How can a Septic tank be reinforced? - ANSWER ✔ six inch by 6 inch
(6"x6") No.10 gage welded steel reinforcing wire OR fibrous reinforcing
material conforming to ASTM specifications for such materials.
22.How must Tank Lids be Reinforced? - ANSWER ✔ using three-eights
steel reinforcing rods (rebar) which shall be spaced twelve inches (12") on
center each way extending a minimum of two and one half (2 1/2") inches
and a maximum of three (3") from the outside edge of the tank lid.
23.In general, the tank must be able to withstand a uniform live load of
______________________ pounds per square foot in addition to all loads to
which an underground tank is normally subjected. - ANSWER ✔ 150
24.How do Siphons work? - ANSWER ✔ As the dosing tank fills, head
pressure increases in the tank to a point that will force the effluent through
the siphon which is a specially designed trap, creating suction in the
discharge line that empties the contents of the dosing tank to the level of the
siphon bell and sniff hole. Equilibrium is then re-established in the line until
the water level rises again to the level that the process starts all over again.
, 25.As with pumps, single siphons are used for systems with more than ______
linear feet of field line and alternating siphons are used for systems with
more than _______ linear feet of field line. - ANSWER ✔ 500, (single)
1000, (alternating)
26.When installing siphons, care should be taken to assure they are installed
____________ and are _____________________________ - ANSWER ✔
level and are primed with water.
27.Grease traps are required for any installation where the amount of grease in
the effluent stream exceeds _____________ milligrams per liter - ANSWER
✔ 50 mg/l
28.Grease traps are rarely used for homes. Their main application is in treating
_____________ waste waters from motels, cafeterias, restaurants, hospitals,
schools and other institutions with large volumes of kitchen wastewater. -
ANSWER ✔ Kitchen
29.No part of an individual sewage system location shall be within_____feet of
a building, foundation or property line. - ANSWER ✔ 10
30.No part of an individual sewage system location shall be within_____feet of
a public water supply line - ANSWER ✔ 25
31.No part of an individual sewage system location shall be within_____feet of
a private water supply line. - ANSWER ✔ 10
32.There shall be a minimum of ______ feet between any portion of a standard
soil absorption system and seasonal groundwater bedrock, and any other
impermeable layer - ANSWER ✔ 3
33.There shall be no standard septic tank soil absorption system installed in
soils where percolation test results show an average percolation time of less
than_____ minutes per inch. - ANSWER ✔ 5
34.A minimum of _____ test holes for perc test - ANSWER ✔ 4
Conventional EXAM STUDY GUIDE
2026/2027 ACCURATE QUESTIONS WITH
CORRECT DETAILED SOLUTIONS ||
100% GUARANTEED PASS
<NEWEST VERSION>
1. On-site sewage system - ANSWER ✔ A system for treating and disposing
of wastewater from a single property, typically involving a septic tank and
soil absorption system.
2. Grease traps - ANSWER ✔ Devices used to intercept and retain grease and
solids from wastewater before they enter the sewage system.
3. Soil absorption system - ANSWER ✔ A component of an on-site sewage
system that allows treated wastewater to be absorbed into the soil.
4. Permit requirements for sewage systems - ANSWER ✔ A permit is
generally required for the installation of an on-site sewage system by a
homeowner.
5. Treatment chamber necessity - ANSWER ✔ A treatment chamber is
necessary prior to soil absorption to ensure proper treatment of wastewater.
6. Criteria for selecting OSSF system - ANSWER ✔ The most important
criteria is to select a system that functions properly.
7. Components to be removed from wastewater - ANSWER ✔ Settleable
solids and grease must be removed from the wastewater for a soil absorption
system to operate effectively.
,8. Application for a permit - ANSWER ✔ Name and address of property
owner, location, type of facility to be served, type of water supply, number
of bedrooms and or est gallons of sewage flow per day, soil information.
9. Additional information for permits - ANSWER ✔ location of trash pits,
water supply lines, utility lines, proposed swimming pools, out buildings,
driveways or other paved areas, and any other features that may affect the
suitability of the site.
10.Facility with occupancy of two hours or more. - ANSWER ✔ Must provide
an approved on-site sewage management system. All wastewater generated
from a facility including washing machine water must be disposed of in an
approved system. Pit privies are an acceptable means of sewage disposal for
a facility not served by water under pressure.
11.Repairs, replacements, additions to existing system - ANSWER ✔ Must be
permitted and inspected, if pumping the septic tank is required, this must be
performed by a licensed sewage removal contractor in accordance with the
regulations.
12.After having completed the application process, - ANSWER ✔ A site
inspection is conducted.
13.What the inspector considers on the application. - ANSWER ✔ House
location, soil characteristics, absorption rates, ground water conditions, rock
conditions, lay of the land, bodies of water, streams and other factors which
affect the suitability of the lot.
14.Approved permit will - ANSWER ✔ include the minimum requirements
for the septic system.
All tanks must have: - ANSWER ✔ 2 compartments
15.All tanks whether pre-manufactured or constructed on site shall be
constructed so that the length is ___________ compared to the width. -
ANSWER ✔ at least one and one- half (1 1/2) times... "to the width."
16.Septic Tanks may be made of: - ANSWER ✔ Concrete, Plastic, fiberglass,
or other materials as approved by the department.
,17.Tank compartment partitions will be located: - ANSWER ✔ Not less than
two-thirds or more than three-fourths the Length of the tank from the Inlet
end.
18.Compartment partitions will be constructed so a pass-thru hole or slot equal
to or greater than the diameter of the inlet pipe is positioned below the liquid
surface with a _____________________________. - ANSWER ✔
Minimum 25% to a maximum of 50% of the total liquid depth.
19.Total liquid depth for larger poured-in-place tanks shall have a maximum of
______________inches - ANSWER ✔ 66 inches
20.True or False: Walls and bottom of poured-in-place septic tanks must be
reinforced. - ANSWER ✔ True
21.How can a Septic tank be reinforced? - ANSWER ✔ six inch by 6 inch
(6"x6") No.10 gage welded steel reinforcing wire OR fibrous reinforcing
material conforming to ASTM specifications for such materials.
22.How must Tank Lids be Reinforced? - ANSWER ✔ using three-eights
steel reinforcing rods (rebar) which shall be spaced twelve inches (12") on
center each way extending a minimum of two and one half (2 1/2") inches
and a maximum of three (3") from the outside edge of the tank lid.
23.In general, the tank must be able to withstand a uniform live load of
______________________ pounds per square foot in addition to all loads to
which an underground tank is normally subjected. - ANSWER ✔ 150
24.How do Siphons work? - ANSWER ✔ As the dosing tank fills, head
pressure increases in the tank to a point that will force the effluent through
the siphon which is a specially designed trap, creating suction in the
discharge line that empties the contents of the dosing tank to the level of the
siphon bell and sniff hole. Equilibrium is then re-established in the line until
the water level rises again to the level that the process starts all over again.
, 25.As with pumps, single siphons are used for systems with more than ______
linear feet of field line and alternating siphons are used for systems with
more than _______ linear feet of field line. - ANSWER ✔ 500, (single)
1000, (alternating)
26.When installing siphons, care should be taken to assure they are installed
____________ and are _____________________________ - ANSWER ✔
level and are primed with water.
27.Grease traps are required for any installation where the amount of grease in
the effluent stream exceeds _____________ milligrams per liter - ANSWER
✔ 50 mg/l
28.Grease traps are rarely used for homes. Their main application is in treating
_____________ waste waters from motels, cafeterias, restaurants, hospitals,
schools and other institutions with large volumes of kitchen wastewater. -
ANSWER ✔ Kitchen
29.No part of an individual sewage system location shall be within_____feet of
a building, foundation or property line. - ANSWER ✔ 10
30.No part of an individual sewage system location shall be within_____feet of
a public water supply line - ANSWER ✔ 25
31.No part of an individual sewage system location shall be within_____feet of
a private water supply line. - ANSWER ✔ 10
32.There shall be a minimum of ______ feet between any portion of a standard
soil absorption system and seasonal groundwater bedrock, and any other
impermeable layer - ANSWER ✔ 3
33.There shall be no standard septic tank soil absorption system installed in
soils where percolation test results show an average percolation time of less
than_____ minutes per inch. - ANSWER ✔ 5
34.A minimum of _____ test holes for perc test - ANSWER ✔ 4
