OSSF INSTALLER 2 Actual Exam 2026 || Most Recent Exam 2026|2027
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Which of the following is true of aerobic treatment plants ?
a . Able to maintain a minimum DO of 4.0 mg / L
b . Odor free , utilize aerobic bacteria and produce hydrogen sulfide gas
.
c. Use aerobic bacteria and oxygen to breakdown complex organics and
produce carbon dioxide
d . Use aerobic bacteria and carbon dioxide to produce complex organic
compounds and natural gas -ANSWER-c . Use aerobic bacteria and
oxygen to breakdown complex organics and produce carbon dioxide
To determine if a proprietary aerobic treatment plant is appropriate for
use with surface application disposal it must
a . be on the TCEQ's most recently approved list
b . be able to maintain a minimum DO of 4.0 mg / L
c . have a volume equal to three times the expected daily flow
d . be certified by a PE or RS to provide 90 % or better treatment -
ANSWER-d . be certified by a PE or RS to provide 90 % or better
treatment
,To determine the minimum size of aerobic treatment plant needed for
a particular home , one must know d a . soil acceptance rate ( R₂
b aeration and clarifier volumes
c . rate of irrigation ( R ) from OSSF Rules
d . number of bedrooms in the home and refer to TCEQ Table II -
ANSWER-d number of bedrooms in the home and refer to TCEQ Table II
Which of the following is a likely cause of a " rotten egg " odor from an
aerobic treatment plant ?
a . Chlorinator failure
b . Mechanical aerator failure
c . Failure to install a trash trap
d . Hydraulic overload caused by a leaking toilet -ANSWER-b .
Mechanical aerator failure
and need for wasting ? Which of the following is a way of evaluating an
aerobic treatment plant for excessive solids
a . DO test .
b. BOD5 analysis
c . 30 - min . settling test
d . Chlorine residual test in mg / L -ANSWER-c . 30 min . settling test
Trickling filters and wetlands
, a . are anaerobic treatment systems b . are secondary treatment
processes
c . are widely used across Texas for OSSF treatment
d . rely on straining or filtering as the main treatment mechanism -
ANSWER-b . are secondary treatment processes
Which of the following considerations should receive the greatest
emphasis in selecting a type of OSSF system disposal option ?
a . System cost
b. Electrical rates
c . Soil and site conditions
d . Maintenance and service availability -ANSWER-c . Soil and site
conditions
would include On a west Texas site with 16 in of Class Ia soil over
fractured rock suitable OSSF systems a . lined or unlined ETs
b . lined ET or LPD systems
c . lined ET or mound systems
d . surface application or leaching chamber systems -ANSWER-c . lined
ET or mound systems chamber
The minimum soil requirements for leaching chambers or gravelless
pipe systems following a septic tank are
A. 2 ft . of Class Ib , II , or III soil below the field bottom
Actual Complete Real Exam Questions And Correct Answers (Verified
Answers) Already Graded A+ | Guaranteed Success!! Newest Exam |
Just Released!!
Which of the following is true of aerobic treatment plants ?
a . Able to maintain a minimum DO of 4.0 mg / L
b . Odor free , utilize aerobic bacteria and produce hydrogen sulfide gas
.
c. Use aerobic bacteria and oxygen to breakdown complex organics and
produce carbon dioxide
d . Use aerobic bacteria and carbon dioxide to produce complex organic
compounds and natural gas -ANSWER-c . Use aerobic bacteria and
oxygen to breakdown complex organics and produce carbon dioxide
To determine if a proprietary aerobic treatment plant is appropriate for
use with surface application disposal it must
a . be on the TCEQ's most recently approved list
b . be able to maintain a minimum DO of 4.0 mg / L
c . have a volume equal to three times the expected daily flow
d . be certified by a PE or RS to provide 90 % or better treatment -
ANSWER-d . be certified by a PE or RS to provide 90 % or better
treatment
,To determine the minimum size of aerobic treatment plant needed for
a particular home , one must know d a . soil acceptance rate ( R₂
b aeration and clarifier volumes
c . rate of irrigation ( R ) from OSSF Rules
d . number of bedrooms in the home and refer to TCEQ Table II -
ANSWER-d number of bedrooms in the home and refer to TCEQ Table II
Which of the following is a likely cause of a " rotten egg " odor from an
aerobic treatment plant ?
a . Chlorinator failure
b . Mechanical aerator failure
c . Failure to install a trash trap
d . Hydraulic overload caused by a leaking toilet -ANSWER-b .
Mechanical aerator failure
and need for wasting ? Which of the following is a way of evaluating an
aerobic treatment plant for excessive solids
a . DO test .
b. BOD5 analysis
c . 30 - min . settling test
d . Chlorine residual test in mg / L -ANSWER-c . 30 min . settling test
Trickling filters and wetlands
, a . are anaerobic treatment systems b . are secondary treatment
processes
c . are widely used across Texas for OSSF treatment
d . rely on straining or filtering as the main treatment mechanism -
ANSWER-b . are secondary treatment processes
Which of the following considerations should receive the greatest
emphasis in selecting a type of OSSF system disposal option ?
a . System cost
b. Electrical rates
c . Soil and site conditions
d . Maintenance and service availability -ANSWER-c . Soil and site
conditions
would include On a west Texas site with 16 in of Class Ia soil over
fractured rock suitable OSSF systems a . lined or unlined ETs
b . lined ET or LPD systems
c . lined ET or mound systems
d . surface application or leaching chamber systems -ANSWER-c . lined
ET or mound systems chamber
The minimum soil requirements for leaching chambers or gravelless
pipe systems following a septic tank are
A. 2 ft . of Class Ib , II , or III soil below the field bottom
