OSSF DR COMPREHENSIVE EXAM 2026 QUESTIONS AND
SOLUTIONS SCORED A+
✔✔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 cause ________. - ✔✔amoeba
dysentery and Giardiasis
✔✔Waterborne diseases that spread by pathogenic bacteria include _________. -
✔✔typhoid, cholera, and dysentery
✔✔Microorganisms in wastewater include __________. - ✔✔bacteria, viruses, protozoa
and helminths.
✔✔Microorganisms that cause disease are called _________. - ✔✔pathogens
✔✔Domestic wastewater contains microorganisms that are capable of causing
_________. - ✔✔infectious diseases
✔✔An official inspector of a new OSSF is a(n) _______. - ✔✔designated representative
✔✔A trench requires 430 cubic feet of gravel. How many cubic yards must be
purchased? - ✔✔16 cubic yards
✔✔A septic tank had a working volume of 31 cubic feet. How many gallons does this
septic tank hold? - ✔✔approx. 232 gals
✔✔The area of a lot is 20,076 square feet. What is the area of this lot in acres? -
✔✔0.46 acres
✔✔A trench measures 30 inches wide. How wide is the trench in feet? - ✔✔2.5'
✔✔A particular hazard that OSSF installers face that most construction workers do not
is _______. - ✔✔infectious waterborne diseases
, ✔✔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-pressure dosing drain field at
a rental house? - ✔✔Installer II
✔✔Planning materials for an OSSF utilizing secondary treatment must be prepared by
a/an - ✔✔PE (professional engineer) or RS (registered sanitarian)
✔✔Penalties for violating the laws, rules, or regulations covering OSSF can be imposed
under what headings - ✔✔criminal, injunction, administrative
✔✔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 individual must complete
_______ of TCEQ-approved continuing education courses in order to renew license. -
✔✔3 years, 24 hours
✔✔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 for an OSSF ___________
cannot work as an Installer, Designer for a fee, or private Site Evaluator within the
jurisdiction of the permitting authority. - ✔✔Designated representative (DR), permitting
authority
✔✔List the OSSF licenses that require previous experience - ✔✔installer II, Site
evaluator (SE), and Maintenance Provider (MP)
✔✔An individual who visits a site and conducts soil evaluations and a site survey is a(n)
__________. - ✔✔site evaulator
SOLUTIONS SCORED A+
✔✔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 cause ________. - ✔✔amoeba
dysentery and Giardiasis
✔✔Waterborne diseases that spread by pathogenic bacteria include _________. -
✔✔typhoid, cholera, and dysentery
✔✔Microorganisms in wastewater include __________. - ✔✔bacteria, viruses, protozoa
and helminths.
✔✔Microorganisms that cause disease are called _________. - ✔✔pathogens
✔✔Domestic wastewater contains microorganisms that are capable of causing
_________. - ✔✔infectious diseases
✔✔An official inspector of a new OSSF is a(n) _______. - ✔✔designated representative
✔✔A trench requires 430 cubic feet of gravel. How many cubic yards must be
purchased? - ✔✔16 cubic yards
✔✔A septic tank had a working volume of 31 cubic feet. How many gallons does this
septic tank hold? - ✔✔approx. 232 gals
✔✔The area of a lot is 20,076 square feet. What is the area of this lot in acres? -
✔✔0.46 acres
✔✔A trench measures 30 inches wide. How wide is the trench in feet? - ✔✔2.5'
✔✔A particular hazard that OSSF installers face that most construction workers do not
is _______. - ✔✔infectious waterborne diseases
, ✔✔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-pressure dosing drain field at
a rental house? - ✔✔Installer II
✔✔Planning materials for an OSSF utilizing secondary treatment must be prepared by
a/an - ✔✔PE (professional engineer) or RS (registered sanitarian)
✔✔Penalties for violating the laws, rules, or regulations covering OSSF can be imposed
under what headings - ✔✔criminal, injunction, administrative
✔✔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 individual must complete
_______ of TCEQ-approved continuing education courses in order to renew license. -
✔✔3 years, 24 hours
✔✔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 for an OSSF ___________
cannot work as an Installer, Designer for a fee, or private Site Evaluator within the
jurisdiction of the permitting authority. - ✔✔Designated representative (DR), permitting
authority
✔✔List the OSSF licenses that require previous experience - ✔✔installer II, Site
evaluator (SE), and Maintenance Provider (MP)
✔✔An individual who visits a site and conducts soil evaluations and a site survey is a(n)
__________. - ✔✔site evaulator
