ONSITE SEWAGE SYSTEM INSTALLER EXAM
2026 FINAL EXAM PAPER COMPLETE
QUESTIONS AND SOLUTIONS
◉ What are some types of onsite sewage treatment receptacles?
Answer: Septic tanks, gray water tanks, laundry tanks, grease
interceptors, dosing tanks, aerobic treatment unit tanks, and
stationary holding tanks.
◉ What materials are commonly used to construct sewage
treatment tanks? Answer: Concrete, fiberglass, or polyethylene.
◉ What is the minimum capacity for a grease interceptor connected
to an on-site sewage system in Florida? Answer: 750 gallons.
◉ What is the maximum capacity for a grease interceptor in Florida?
Answer: 1,250 gallons.
◉ What happens to fats, oils, greases, and solids in a grease
interceptor? Answer: They separate from wastewater, with fats and
oils floating and solids sinking.
,◉ Why are grease interceptors not required for residential homes?
Answer: They are only required where sufficient amounts of grease
are produced, typically in food service establishments.
◉ What is the purpose of a dosing tank in an onsite sewage system?
Answer: To distribute effluent to a drain field or other parts of the
sewage treatment system.
◉ What must be done to the electrical conduit in a dosing tank?
Answer: It must exit through a riser, not through a chipped part of
the manhole cover.
◉ What is the required effective capacity for the first chamber of a
dual compartment septic tank? Answer: At least two-thirds of the
total required effective capacity.
◉ What is the minimum effective capacity for the second chamber of
a dual compartment septic tank? Answer: At least one-fifth of the
total required effective capacity.
◉ What is the smallest allowable tank size in a repair situation?
Answer: 600 gallons.
, ◉ What standard must seals meet according to Florida regulations?
Answer: ASTMC 923-98, for resilient connectors between concrete
structures and pipes.
◉ When were outlet filters required on all single compartment
tanks? Answer: March 1, 1995.
◉ What is the typical filtration slot size for residential outlet filters?
Answer: Between 1/8 inch to 1/16 inch.
◉ What must all filters installed after January 1, 2010, have?
Answer: They must be indelibly labeled with the manufacturer's
name and model.
◉ What is the purpose of outlet filters in sewage systems? Answer:
To prevent anything other than liquid from reaching the drain field.
◉ What is the requirement for sealing joints of receptacles? Answer:
They must be sealed using a bonding compound that meets ASTM C
990-96.
◉ What should tank legends indicate according to Florida
regulations? Answer: They should be cast, stamped, stenciled, or
decaled onto the wall at the inlet end.
2026 FINAL EXAM PAPER COMPLETE
QUESTIONS AND SOLUTIONS
◉ What are some types of onsite sewage treatment receptacles?
Answer: Septic tanks, gray water tanks, laundry tanks, grease
interceptors, dosing tanks, aerobic treatment unit tanks, and
stationary holding tanks.
◉ What materials are commonly used to construct sewage
treatment tanks? Answer: Concrete, fiberglass, or polyethylene.
◉ What is the minimum capacity for a grease interceptor connected
to an on-site sewage system in Florida? Answer: 750 gallons.
◉ What is the maximum capacity for a grease interceptor in Florida?
Answer: 1,250 gallons.
◉ What happens to fats, oils, greases, and solids in a grease
interceptor? Answer: They separate from wastewater, with fats and
oils floating and solids sinking.
,◉ Why are grease interceptors not required for residential homes?
Answer: They are only required where sufficient amounts of grease
are produced, typically in food service establishments.
◉ What is the purpose of a dosing tank in an onsite sewage system?
Answer: To distribute effluent to a drain field or other parts of the
sewage treatment system.
◉ What must be done to the electrical conduit in a dosing tank?
Answer: It must exit through a riser, not through a chipped part of
the manhole cover.
◉ What is the required effective capacity for the first chamber of a
dual compartment septic tank? Answer: At least two-thirds of the
total required effective capacity.
◉ What is the minimum effective capacity for the second chamber of
a dual compartment septic tank? Answer: At least one-fifth of the
total required effective capacity.
◉ What is the smallest allowable tank size in a repair situation?
Answer: 600 gallons.
, ◉ What standard must seals meet according to Florida regulations?
Answer: ASTMC 923-98, for resilient connectors between concrete
structures and pipes.
◉ When were outlet filters required on all single compartment
tanks? Answer: March 1, 1995.
◉ What is the typical filtration slot size for residential outlet filters?
Answer: Between 1/8 inch to 1/16 inch.
◉ What must all filters installed after January 1, 2010, have?
Answer: They must be indelibly labeled with the manufacturer's
name and model.
◉ What is the purpose of outlet filters in sewage systems? Answer:
To prevent anything other than liquid from reaching the drain field.
◉ What is the requirement for sealing joints of receptacles? Answer:
They must be sealed using a bonding compound that meets ASTM C
990-96.
◉ What should tank legends indicate according to Florida
regulations? Answer: They should be cast, stamped, stenciled, or
decaled onto the wall at the inlet end.
