Minnesota Subsurface Sewage
Treatment System Service Provider
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. What is the primary purpose of a subsurface sewage treatment system
(SSTS)?
a) To store solid waste indefinitely
b) To treat and disperse wastewater into the soil
c) To incinerate sewage
d) To pump sewage into surface water
b) To treat and disperse wastewater into the soil
The main function of an SSTS is to treat wastewater through biological,
chemical, and physical processes in soil before dispersal.
, 2. Which component is typically found first in a conventional SSTS?
a) Soil absorption field
b) Distribution box
c) Septic tank
d) Pump chamber
c) Septic tank
The septic tank is the first major treatment component where solids settle
and primary treatment occurs.
3. What is the main function of a septic tank?
a) Disinfect wastewater
b) Store treated effluent
c) Separate solids from liquids
d) Evaporate sewage
c) Separate solids from liquids
A septic tank allows solids to settle and scum to rise, separating them from
liquid effluent.
4. Effluent leaving a septic tank is typically:
a) Fully sterile
b) Partially treated wastewater
c) Solid sludge
d) Drinking water quality
,b) Partially treated wastewater
Effluent still contains pathogens and nutrients and requires further soil
treatment.
5. What is the purpose of a soil absorption system?
a) To burn waste gases
b) To further treat and disperse effluent
c) To store sewage long-term
d) To compress solids
b) To further treat and disperse effluent
Soil provides biological and physical treatment as wastewater percolates
through it.
6. What is biomat formation in an SSTS?
a) A concrete lining
b) A layer of accumulated biological growth in soil
c) A metal filter
d) A pumping barrier
b) A layer of accumulated biological growth in soil
Biomat forms at the soil interface and affects infiltration rates.
7. Which soil texture has the fastest infiltration rate?
a) Clay
b) Silt
, c) Sand
d) Loam
c) Sand
Sandy soils have large pore spaces, allowing faster water movement.
8. Which soil type generally has the slowest infiltration rate?
a) Gravel
b) Sand
c) Clay
d) Coarse sand
c) Clay
Clay particles are very small and compact, reducing permeability.
9. The purpose of a distribution box is to:
a) Store sludge
b) Evenly distribute effluent to drainfield lines
c) Pump wastewater
d) Filter solids
b) Evenly distribute effluent to drainfield lines
A distribution box ensures equal flow to all trenches.
10. Which condition most negatively affects SSTS performance?
a) Moderate rainfall
Treatment System Service Provider
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of a subsurface sewage treatment system
(SSTS)?
a) To store solid waste indefinitely
b) To treat and disperse wastewater into the soil
c) To incinerate sewage
d) To pump sewage into surface water
b) To treat and disperse wastewater into the soil
The main function of an SSTS is to treat wastewater through biological,
chemical, and physical processes in soil before dispersal.
, 2. Which component is typically found first in a conventional SSTS?
a) Soil absorption field
b) Distribution box
c) Septic tank
d) Pump chamber
c) Septic tank
The septic tank is the first major treatment component where solids settle
and primary treatment occurs.
3. What is the main function of a septic tank?
a) Disinfect wastewater
b) Store treated effluent
c) Separate solids from liquids
d) Evaporate sewage
c) Separate solids from liquids
A septic tank allows solids to settle and scum to rise, separating them from
liquid effluent.
4. Effluent leaving a septic tank is typically:
a) Fully sterile
b) Partially treated wastewater
c) Solid sludge
d) Drinking water quality
,b) Partially treated wastewater
Effluent still contains pathogens and nutrients and requires further soil
treatment.
5. What is the purpose of a soil absorption system?
a) To burn waste gases
b) To further treat and disperse effluent
c) To store sewage long-term
d) To compress solids
b) To further treat and disperse effluent
Soil provides biological and physical treatment as wastewater percolates
through it.
6. What is biomat formation in an SSTS?
a) A concrete lining
b) A layer of accumulated biological growth in soil
c) A metal filter
d) A pumping barrier
b) A layer of accumulated biological growth in soil
Biomat forms at the soil interface and affects infiltration rates.
7. Which soil texture has the fastest infiltration rate?
a) Clay
b) Silt
, c) Sand
d) Loam
c) Sand
Sandy soils have large pore spaces, allowing faster water movement.
8. Which soil type generally has the slowest infiltration rate?
a) Gravel
b) Sand
c) Clay
d) Coarse sand
c) Clay
Clay particles are very small and compact, reducing permeability.
9. The purpose of a distribution box is to:
a) Store sludge
b) Evenly distribute effluent to drainfield lines
c) Pump wastewater
d) Filter solids
b) Evenly distribute effluent to drainfield lines
A distribution box ensures equal flow to all trenches.
10. Which condition most negatively affects SSTS performance?
a) Moderate rainfall
