OSSF DR Test Practice| Complete Practice Questions & Verified Answers 2026/2027
Nitrogen or nitrate removal in soil occurs by _________. vegetation uptake
The factors influencing the survival of bacteria in soil are moisture, temperature, pH, and organic matter.
_______.
Physical removal of bacteria by straining occurs when the bacteria are larger than the pore openings in the soil
_______.
A solid that can be filtered out of the wastewater is a suspended solid
_________.
Which of the following describes domestic wastewater as fresh, light in color, has dissolved oxygen
it leaves a home?
Which of the following are problems caused by surface water pollution, groundwater contamination, and standing sewage in
malfunctioning septic tank systems? neighborhoods
An inorganic chemical that affects human health is nitrate
Parasites (helminths) found in untreated sewage include hookworm, round worms, and tapeworms
________.
Viruses are responsible for such diseases as poliomyelitis and infectious hepatitis
A type of bacteria that indicates sewage contamination is fecal coliform
________.
Protozoa are very simple animal organisms that may amoeba dysentery and Giardiasis
cause ________.
Waterborne diseases that spread by pathogenic bacteria typhoid, cholera, and dysentery
include _________.
Microorganisms in wastewater include __________. bacteria, viruses, protozoa and helminths.
Microorganisms that cause disease are called pathogens
_________.
Domestic wastewater contains microorganisms that are infectious diseases
capable of causing _________.
An official inspector of a new OSSF is a(n) _______. designated representative
, OSSF DR Test Practice| Complete Practice Questions & Verified Answers 2026/2027
A trench requires 430 cubic feet of gravel. How many 16 cubic yards
cubic yards must be purchased?
A septic tank had a working volume of 31 cubic feet. How approx. 232 gals
many gallons does this septic tank hold?
The area of a lot is 20,076 square feet. What is the area 0.46 acres
of this lot in acres?
A trench measures 30 inches wide. How wide is the 2.5'
trench in feet?
A particular hazard that OSSF installers face that most infectious waterborne diseases
construction workers do not is _______.
List the equipment and procedures to protect a work site. signs, regulated speed, cones, barricade, high level flags
Who can legally install a septic tank followed by a low- Installer II
pressure dosing drain field at a rental house?
Planning materials for an OSSF utilizing secondary PE (professional engineer) or RS (registered sanitarian)
treatment must be prepared by a/an
Penalties for violating the laws, rules, or regulations criminal, injunction, administrative
covering OSSF can be imposed under what headings
List the 9 steps of the permitting process 1) Site Evaluations
2) Selection of an OSSF
3) System must be planned
4) Professional designer (PE or RS) submits planning materials
5) Permit application and planning materials must be prepared and submitted
6) The application and planning materials are reviewed by permitting authority
7) Authorization or permit to construct (ATC) must be granted by permitting
authority BEFORE construction can begin
8) Construction begins after ATC recieved.
9) System must be inspected by permitting agency.
10) Notice of approval (NOA) and permit or license to operate will be issued by
the permitting agency when completed System has passed all inspections.
New OSSF licenses are issued for a term of ______. An 3 years, 24 hours
individual must complete _______ of TCEQ-approved
continuing education courses in order to renew license.
What is needed to pre-qualify for an exam? submitting an application and notarized experience statements, paying class and
application fees, and successfully completing the appropriate training course
Individuals working as a __________ or in any capacity Designated representative (DR), permitting authority
for an OSSF ___________ cannot work as an Installer,
Designer for a fee, or private Site Evaluator within the
jurisdiction of the permitting authority.
List the OSSF licenses that require previous experience installer II, Site evaluator (SE), and Maintenance Provider (MP)
Nitrogen or nitrate removal in soil occurs by _________. vegetation uptake
The factors influencing the survival of bacteria in soil are moisture, temperature, pH, and organic matter.
_______.
Physical removal of bacteria by straining occurs when the bacteria are larger than the pore openings in the soil
_______.
A solid that can be filtered out of the wastewater is a suspended solid
_________.
Which of the following describes domestic wastewater as fresh, light in color, has dissolved oxygen
it leaves a home?
Which of the following are problems caused by surface water pollution, groundwater contamination, and standing sewage in
malfunctioning septic tank systems? neighborhoods
An inorganic chemical that affects human health is nitrate
Parasites (helminths) found in untreated sewage include hookworm, round worms, and tapeworms
________.
Viruses are responsible for such diseases as poliomyelitis and infectious hepatitis
A type of bacteria that indicates sewage contamination is fecal coliform
________.
Protozoa are very simple animal organisms that may amoeba dysentery and Giardiasis
cause ________.
Waterborne diseases that spread by pathogenic bacteria typhoid, cholera, and dysentery
include _________.
Microorganisms in wastewater include __________. bacteria, viruses, protozoa and helminths.
Microorganisms that cause disease are called pathogens
_________.
Domestic wastewater contains microorganisms that are infectious diseases
capable of causing _________.
An official inspector of a new OSSF is a(n) _______. designated representative
, OSSF DR Test Practice| Complete Practice Questions & Verified Answers 2026/2027
A trench requires 430 cubic feet of gravel. How many 16 cubic yards
cubic yards must be purchased?
A septic tank had a working volume of 31 cubic feet. How approx. 232 gals
many gallons does this septic tank hold?
The area of a lot is 20,076 square feet. What is the area 0.46 acres
of this lot in acres?
A trench measures 30 inches wide. How wide is the 2.5'
trench in feet?
A particular hazard that OSSF installers face that most infectious waterborne diseases
construction workers do not is _______.
List the equipment and procedures to protect a work site. signs, regulated speed, cones, barricade, high level flags
Who can legally install a septic tank followed by a low- Installer II
pressure dosing drain field at a rental house?
Planning materials for an OSSF utilizing secondary PE (professional engineer) or RS (registered sanitarian)
treatment must be prepared by a/an
Penalties for violating the laws, rules, or regulations criminal, injunction, administrative
covering OSSF can be imposed under what headings
List the 9 steps of the permitting process 1) Site Evaluations
2) Selection of an OSSF
3) System must be planned
4) Professional designer (PE or RS) submits planning materials
5) Permit application and planning materials must be prepared and submitted
6) The application and planning materials are reviewed by permitting authority
7) Authorization or permit to construct (ATC) must be granted by permitting
authority BEFORE construction can begin
8) Construction begins after ATC recieved.
9) System must be inspected by permitting agency.
10) Notice of approval (NOA) and permit or license to operate will be issued by
the permitting agency when completed System has passed all inspections.
New OSSF licenses are issued for a term of ______. An 3 years, 24 hours
individual must complete _______ of TCEQ-approved
continuing education courses in order to renew license.
What is needed to pre-qualify for an exam? submitting an application and notarized experience statements, paying class and
application fees, and successfully completing the appropriate training course
Individuals working as a __________ or in any capacity Designated representative (DR), permitting authority
for an OSSF ___________ cannot work as an Installer,
Designer for a fee, or private Site Evaluator within the
jurisdiction of the permitting authority.
List the OSSF licenses that require previous experience installer II, Site evaluator (SE), and Maintenance Provider (MP)
