TEXAS ON-SITE SEWAGE FACILITIES
(OSSF) TEST 2026/2027 BANK EXAM
QUESTIONS ACCURATE ACTUAL EXAM /
FREQUENTLY TESTED QUESTIONS WITH
DETAILED ANSWERS | GUARANTEED PASS
| GRADED A | LATEST UPDATE
Would a treatment plant capable of handling 1500 gallons
per day of wastewater with BOD as high as 280 mg/L be
capable of handling wastewater from the above washateria?
What is the organic loading capacity of this treatment
plant? - ....ANSWER...3.50 lbs/day
What is the loading rate of a system with: Q= 550GPD,
BOD= 350 mg/L, Ph=8.4, TSS= 400 mg/L -
....ANSWER...1.6 lbs/day
The most commonly use primary treatment component in
Texas for on-site systems is the - ....ANSWER...septic tank
,Which of the following produces the highest quality
effluent? - ....ANSWER...city sewage treatment plant
what is the purpose of the inlet baffle or T? -
....ANSWER...Reduce velocity and disperse flow, vent the
tank to the building plumbing
The minimum distances a watertight sewage treatment
tank should be from a water-well and a property line are -
....ANSWER...50 feet and 5 feet respectively
which of the following is true regarding septic tanks? -
....ANSWER...The must have two- or three-compartments
A septic tank serving a new five-bedroom home with 3800
sqft must have a minimum capacity of -
....ANSWER...1,250 gallons
Of what materials may a septic tank be constructed? -
....ANSWER...steel reinforced concrete
,The expected volume of wastewater (Q) in gal/day from an
older (pre-1990) three-bedroom mobile home would be -
....ANSWER...300
Which of the following characteristics should a poured-in-
place concrete septic tanks have? -
....ANSWER...watertight, designed by PE, Structurally
sound
The standard inlet and outlet devices in a septic tank should
be - ....ANSWER...tees
Properly sealed septic tanks are - ....ANSWER...vented
through the building plumbing
The liquid depth of a septic tank - ....ANSWER...must be at
least 30 inches
Which of the following is true of a septic tank with 15
inches of cover? - ....ANSWER...it must have an access
port with a riser
, Which if the following is acceptable for the line from the
building to the treatment tank? - ....ANSWER...cast iron,
SDR 26 plastic pipe, and Schedule 40 plastic pipe
Most of the settable solids and scum that enter a properly
designed septic tank will be - ....ANSWER...removed in the
first compartment
Which of the following should a house sewer have? -
....ANSWER...A two way sanitary clean-out, minimum 1/8
inch per foot fall, minimum diameter of 3 inches
Which of the following applies if effluent is to be pumped? -
....ANSWER...A high-water alarm must be provided, the
pump must be installed in a separate chamber, a check
valve should be in line if the disposal area is upgrade
T/F: Septic tanks may be 1.5 inch-thick steel -
....ANSWER...F
T/F: Septic tanks may be reinforced fiberglass -
....ANSWER...T
(OSSF) TEST 2026/2027 BANK EXAM
QUESTIONS ACCURATE ACTUAL EXAM /
FREQUENTLY TESTED QUESTIONS WITH
DETAILED ANSWERS | GUARANTEED PASS
| GRADED A | LATEST UPDATE
Would a treatment plant capable of handling 1500 gallons
per day of wastewater with BOD as high as 280 mg/L be
capable of handling wastewater from the above washateria?
What is the organic loading capacity of this treatment
plant? - ....ANSWER...3.50 lbs/day
What is the loading rate of a system with: Q= 550GPD,
BOD= 350 mg/L, Ph=8.4, TSS= 400 mg/L -
....ANSWER...1.6 lbs/day
The most commonly use primary treatment component in
Texas for on-site systems is the - ....ANSWER...septic tank
,Which of the following produces the highest quality
effluent? - ....ANSWER...city sewage treatment plant
what is the purpose of the inlet baffle or T? -
....ANSWER...Reduce velocity and disperse flow, vent the
tank to the building plumbing
The minimum distances a watertight sewage treatment
tank should be from a water-well and a property line are -
....ANSWER...50 feet and 5 feet respectively
which of the following is true regarding septic tanks? -
....ANSWER...The must have two- or three-compartments
A septic tank serving a new five-bedroom home with 3800
sqft must have a minimum capacity of -
....ANSWER...1,250 gallons
Of what materials may a septic tank be constructed? -
....ANSWER...steel reinforced concrete
,The expected volume of wastewater (Q) in gal/day from an
older (pre-1990) three-bedroom mobile home would be -
....ANSWER...300
Which of the following characteristics should a poured-in-
place concrete septic tanks have? -
....ANSWER...watertight, designed by PE, Structurally
sound
The standard inlet and outlet devices in a septic tank should
be - ....ANSWER...tees
Properly sealed septic tanks are - ....ANSWER...vented
through the building plumbing
The liquid depth of a septic tank - ....ANSWER...must be at
least 30 inches
Which of the following is true of a septic tank with 15
inches of cover? - ....ANSWER...it must have an access
port with a riser
, Which if the following is acceptable for the line from the
building to the treatment tank? - ....ANSWER...cast iron,
SDR 26 plastic pipe, and Schedule 40 plastic pipe
Most of the settable solids and scum that enter a properly
designed septic tank will be - ....ANSWER...removed in the
first compartment
Which of the following should a house sewer have? -
....ANSWER...A two way sanitary clean-out, minimum 1/8
inch per foot fall, minimum diameter of 3 inches
Which of the following applies if effluent is to be pumped? -
....ANSWER...A high-water alarm must be provided, the
pump must be installed in a separate chamber, a check
valve should be in line if the disposal area is upgrade
T/F: Septic tanks may be 1.5 inch-thick steel -
....ANSWER...F
T/F: Septic tanks may be reinforced fiberglass -
....ANSWER...T
