1|Page
OSSF DESIGNATED REPRESENTATIVE EXAM
NEWEST 2025 ACTUAL EXAM TEST BANK|
COMPLETE 350 REAL EXAM QUESTIONS AND
CORRECT VERIFIED ANSWERS/ ALREADY GRADED
A+ (MOST RECENT!!)
An inorganic chemical that affects human health is - ANSWER - nitrate
Parasites (helminths) found in untreated sewage include ________. -
ANSWER - hookworm, round worms, and tapeworms
Viruses are responsible for such diseases as - ANSWER - poliomyelitis
and infectious hepatitis
A type of bacteria that indicates sewage contamination is ________. -
ANSWER - fecal coliform
Protozoa are very simple animal organisms that may cause ________. -
ANSWER - amoeba dysentery and Giardiasis
Waterborne diseases that spread by pathogenic bacteria include
_________. - ANSWER - typhoid, cholera, and dysentery
pg. 1
,2|Page
Microorganisms in wastewater include __________. - ANSWER -
bacteria, viruses, protozoa and helminths.
Microorganisms that cause disease are called _________. - ANSWER -
pathogens
Domestic wastewater contains microorganisms that are capable of
causing _________. - ANSWER - infectious diseases
An official inspector of a new OSSF is a(n) _______. - ANSWER -
designated representative
A trench requires 430 cubic feet of gravel. How many cubic yards must
be purchased? - ANSWER - 16 cubic yards
A septic tank had a working volume of 31 cubic feet. How many gallons
does this septic tank hold? - ANSWER - approx. 232 gals
The area of a lot is 20,076 square feet. What is the area of this lot in
acres? - ANSWER - 0.46 acres
A trench measures 30 inches wide. How wide is the trench in feet? -
ANSWER - 2.5'
pg. 2
,3|Page
A particular hazard that OSSF installers face that most construction
workers do not is _______. - ANSWER - infectious waterborne diseases
List the equipment and procedures to protect a work site. - ANSWER -
signs, regulated speed, cones, barricade, high level flags
Who can legally install a septic tank followed by a low-pressure dosing
drain field at a rental house? - ANSWER - Installer II
Planning materials for an OSSF utilizing secondary treatment must be
prepared by a/an - ANSWER - PE (professional engineer) or RS
(registered sanitarian)
Penalties for violating the laws, rules, or regulations covering OSSF can
be imposed under what headings - ANSWER - criminal, injunction,
administrative
List the 9 steps of the permitting process - ANSWER - 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
pg. 3
, 4|Page
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 individual must
complete _______ of TCEQ-approved continuing education courses in
order to renew license. - ANSWER - 3 years, 24 hours
What is needed to pre-qualify for an exam? - ANSWER - 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 for an OSSF
___________ cannot work as an Installer, Designer for a fee, or private
Site Evaluator within the jurisdiction of the permitting authority. -
ANSWER - Designated representative (DR), permitting authority
List the OSSF licenses that require previous experience - ANSWER -
installer II, Site evaluator (SE), and Maintenance Provider (MP)
pg. 4
OSSF DESIGNATED REPRESENTATIVE EXAM
NEWEST 2025 ACTUAL EXAM TEST BANK|
COMPLETE 350 REAL EXAM QUESTIONS AND
CORRECT VERIFIED ANSWERS/ ALREADY GRADED
A+ (MOST RECENT!!)
An inorganic chemical that affects human health is - ANSWER - nitrate
Parasites (helminths) found in untreated sewage include ________. -
ANSWER - hookworm, round worms, and tapeworms
Viruses are responsible for such diseases as - ANSWER - poliomyelitis
and infectious hepatitis
A type of bacteria that indicates sewage contamination is ________. -
ANSWER - fecal coliform
Protozoa are very simple animal organisms that may cause ________. -
ANSWER - amoeba dysentery and Giardiasis
Waterborne diseases that spread by pathogenic bacteria include
_________. - ANSWER - typhoid, cholera, and dysentery
pg. 1
,2|Page
Microorganisms in wastewater include __________. - ANSWER -
bacteria, viruses, protozoa and helminths.
Microorganisms that cause disease are called _________. - ANSWER -
pathogens
Domestic wastewater contains microorganisms that are capable of
causing _________. - ANSWER - infectious diseases
An official inspector of a new OSSF is a(n) _______. - ANSWER -
designated representative
A trench requires 430 cubic feet of gravel. How many cubic yards must
be purchased? - ANSWER - 16 cubic yards
A septic tank had a working volume of 31 cubic feet. How many gallons
does this septic tank hold? - ANSWER - approx. 232 gals
The area of a lot is 20,076 square feet. What is the area of this lot in
acres? - ANSWER - 0.46 acres
A trench measures 30 inches wide. How wide is the trench in feet? -
ANSWER - 2.5'
pg. 2
,3|Page
A particular hazard that OSSF installers face that most construction
workers do not is _______. - ANSWER - infectious waterborne diseases
List the equipment and procedures to protect a work site. - ANSWER -
signs, regulated speed, cones, barricade, high level flags
Who can legally install a septic tank followed by a low-pressure dosing
drain field at a rental house? - ANSWER - Installer II
Planning materials for an OSSF utilizing secondary treatment must be
prepared by a/an - ANSWER - PE (professional engineer) or RS
(registered sanitarian)
Penalties for violating the laws, rules, or regulations covering OSSF can
be imposed under what headings - ANSWER - criminal, injunction,
administrative
List the 9 steps of the permitting process - ANSWER - 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
pg. 3
, 4|Page
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 individual must
complete _______ of TCEQ-approved continuing education courses in
order to renew license. - ANSWER - 3 years, 24 hours
What is needed to pre-qualify for an exam? - ANSWER - 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 for an OSSF
___________ cannot work as an Installer, Designer for a fee, or private
Site Evaluator within the jurisdiction of the permitting authority. -
ANSWER - Designated representative (DR), permitting authority
List the OSSF licenses that require previous experience - ANSWER -
installer II, Site evaluator (SE), and Maintenance Provider (MP)
pg. 4
