Page 1 of 65
2026 TEXAS ON-SITE SEWAGE FACILITY
(OSSF) INSTALLER II TEST WITH ALL
COMPLETE CURRENT TESTING QUESTIONS
AND CORRECT (VERIFIED) ANSWERS|TOP-
RATED A+.
OSSF
Ace your Texas OSSF Installer II Test by mastering advanced
system installation, soil profiling, and state construction
standards for on-site wastewater treatment. This exam
evaluates your expertise in building, inspecting, and certifying
complex septic systems according to TCEQ regulations. It is
specifically designed to certify installers for professional
licensure and supervisory roles in Texas.
In the hydrologic cycle, water moves by evaporation and
transpiration into the ___________________ where it comes in
contact with cooler air, condenses, and falls to the ground in
the form of _____________________ (sleet, snow, hail or rain),
and the surface water supply through
_____________________. ✓ ✓...... ANSWER .......
ATMOSPHERE, PRECIPITATION, RUNOFF
, Page 2 of 65
The term ___________ _____________ refers to water that
collects beneath the surface of the earth in porous,
permeable, water-bearing geologic formations or aquifers.
✓ ✓...... ANSWER ....... GROUND WATER
The term __________ _____________ refers to water that is
found above ground in containment areas, such as lakes,
rivers, streams, creeks and reservoirs. ✓ ✓...... ANSWER
....... SURFACE WATERS
Water table aquifers are recharged by ___________
__________________. ✓ ✓...... ANSWER ....... LOCAL
PERCOLATION.
Rock-filled or lined pits dug at least 4 feet deep at the end of
a septic tank absorption field system are called _________
_________. ✓ ✓...... ANSWER ....... SEEPAGE PITS.
Pits constructed in permeable soil with open-jointed
material along the sides to the bottom of the pit that receive
a direct discharge of raw waste water are called
__________________. ✓ ✓...... ANSWER .......
CESSPOOLS.
, Page 3 of 65
How are water born diseases transmitted? ✓ ✓......
ANSWER ....... MICROORGANISMS
What are 3 primary routes of containment for pathogenetic
microorganisms and harmful chemicals from on-site
sewage systems to our environment? ✓ ✓...... ANSWER
....... Neighborhood pollution, groundwater pollution and
surface water pollution.
What problems are a result of neighborhood pollution? ✓
✓...... ANSWER ....... ~Diseases that can be spread by
direct or indirect contact with the standing water.
~Vectors such as roaches and flies, that can also spread
diseases after coming in contact with the waste water.
~Unsightly and unpleasant living conditions that result from
the standing waste water.
~Feuds and bad relationships with neighbors that can result
from waste water problems.
, Page 4 of 65
~Property values drop and real estate transactions fall
through. No one benefits and everyone suffers when
neighborhoods are fouled by waste water.
Why is acceptable quality water vital? ✓ ✓...... ANSWER
....... Sustains human life, the natural environment and
the economic life of Texas
Groundwater that is obtained via a well can be used for what
purpose? ✓ ✓...... ANSWER ....... Agricultural,
industrial/commercial and drinking water.
What is the difference between a water table aquifer and an
artesian aquifer? ✓ ✓...... ANSWER ....... Water table
aquifer is in direct contact with either the soil or the
intermediate belt.
Artesian is overplayed by a layer of impervious material.
What is the static water level? ✓ ✓...... ANSWER .......
Level at which water stands in a well.
2026 TEXAS ON-SITE SEWAGE FACILITY
(OSSF) INSTALLER II TEST WITH ALL
COMPLETE CURRENT TESTING QUESTIONS
AND CORRECT (VERIFIED) ANSWERS|TOP-
RATED A+.
OSSF
Ace your Texas OSSF Installer II Test by mastering advanced
system installation, soil profiling, and state construction
standards for on-site wastewater treatment. This exam
evaluates your expertise in building, inspecting, and certifying
complex septic systems according to TCEQ regulations. It is
specifically designed to certify installers for professional
licensure and supervisory roles in Texas.
In the hydrologic cycle, water moves by evaporation and
transpiration into the ___________________ where it comes in
contact with cooler air, condenses, and falls to the ground in
the form of _____________________ (sleet, snow, hail or rain),
and the surface water supply through
_____________________. ✓ ✓...... ANSWER .......
ATMOSPHERE, PRECIPITATION, RUNOFF
, Page 2 of 65
The term ___________ _____________ refers to water that
collects beneath the surface of the earth in porous,
permeable, water-bearing geologic formations or aquifers.
✓ ✓...... ANSWER ....... GROUND WATER
The term __________ _____________ refers to water that is
found above ground in containment areas, such as lakes,
rivers, streams, creeks and reservoirs. ✓ ✓...... ANSWER
....... SURFACE WATERS
Water table aquifers are recharged by ___________
__________________. ✓ ✓...... ANSWER ....... LOCAL
PERCOLATION.
Rock-filled or lined pits dug at least 4 feet deep at the end of
a septic tank absorption field system are called _________
_________. ✓ ✓...... ANSWER ....... SEEPAGE PITS.
Pits constructed in permeable soil with open-jointed
material along the sides to the bottom of the pit that receive
a direct discharge of raw waste water are called
__________________. ✓ ✓...... ANSWER .......
CESSPOOLS.
, Page 3 of 65
How are water born diseases transmitted? ✓ ✓......
ANSWER ....... MICROORGANISMS
What are 3 primary routes of containment for pathogenetic
microorganisms and harmful chemicals from on-site
sewage systems to our environment? ✓ ✓...... ANSWER
....... Neighborhood pollution, groundwater pollution and
surface water pollution.
What problems are a result of neighborhood pollution? ✓
✓...... ANSWER ....... ~Diseases that can be spread by
direct or indirect contact with the standing water.
~Vectors such as roaches and flies, that can also spread
diseases after coming in contact with the waste water.
~Unsightly and unpleasant living conditions that result from
the standing waste water.
~Feuds and bad relationships with neighbors that can result
from waste water problems.
, Page 4 of 65
~Property values drop and real estate transactions fall
through. No one benefits and everyone suffers when
neighborhoods are fouled by waste water.
Why is acceptable quality water vital? ✓ ✓...... ANSWER
....... Sustains human life, the natural environment and
the economic life of Texas
Groundwater that is obtained via a well can be used for what
purpose? ✓ ✓...... ANSWER ....... Agricultural,
industrial/commercial and drinking water.
What is the difference between a water table aquifer and an
artesian aquifer? ✓ ✓...... ANSWER ....... Water table
aquifer is in direct contact with either the soil or the
intermediate belt.
Artesian is overplayed by a layer of impervious material.
What is the static water level? ✓ ✓...... ANSWER .......
Level at which water stands in a well.
