OSSF TEST PRACTICE EXAM 2026(LATEST
VERSION) (QUESTIONS + ANSWERS)
INSTANT PDF ACCESS AFTER PAYMENT
100% CORRECT!!
Two wastewater tests commonly used to measure the strength of sewage are
the ________ test and the ________ test. - SELECTED ANSWER 👀 **** BOD,
TSS
The minimum water usage rate that should be used for planning an OSSF for a
new home with three bedrooms and 3000 square feet of interior living area is
_______ gallons/day. - SELECTED ANSWER 👀 **** 300
Blockage in the home plumbing system is often caused by _______, ________,
and _________. - SELECTED ANSWER 👀 **** oils, greases, and fats
It is recommended that _____________ are not used because they significantly
increase the amount of suspended solids and organic matter that is discharged
to sewage disposal system. - SELECTED ANSWER 👀 **** garbage disposal
Several samples were taken from a small washateria with seven new water-
conserving machines and sent to a lab for BOD analysis. The average BOD was
406 mg/L. What would be the minimum expected BOD (organic) loading in
lbs./day? - SELECTED ANSWER 👀 **** 4.74 lbs/day
,Domestic wastewater contains microorganisms that are capable of causing
_________. - SELECTED ANSWER 👀 **** infectious diseases
An official inspector of a new OSSF is a(n) _______. - SELECTED ANSWER
👀 **** designated representative
A trench requires 430 cubic feet of gravel. How many cubic yards must be
purchased? - SELECTED ANSWER 👀 **** 16 cubic yards
A septic tank had a working volume of 31 cubic feet. How many gallons does
this septic tank hold? - SELECTED ANSWER 👀 **** approx. 232 gals
The area of a lot is 20,076 square feet. What is the area of this lot in acres? -
SELECTED ANSWER 👀 **** 0.46 acres
A trench measures 30 inches wide. How wide is the trench in feet? -
SELECTED ANSWER 👀 **** 2.5'
A particular hazard that OSSF installers face that most construction workers do
not is _______. - SELECTED ANSWER 👀 **** infectious waterborne diseases
_______ and ________ soil textural classes are always unsuitable for standard
absorptive OSSF - SELECTED ANSWER 👀 **** class IA and IV
List each of the major soil horizons - SELECTED ANSWER 👀 **** surface soil
A, surface soil B, and parent material
, _____________ is a term describing the ability of water to migrate through a soil
profile under either _________ or __________ conditions. - SELECTED
ANSWER 👀 **** Hydraulic conductivity, saturated, unsaturated
Interconnected pores in the soil profile allow ______ and _______ to enter the
soil at its surface and migrate downward - SELECTED ANSWER 👀 **** air,
water
List the four components of soil - SELECTED ANSWER 👀 **** air, water,
organics, inorganics
A drainfield is 50 feet by 90 feet and must be covered with an average of 15
inches of sand loam. How many cubic yards of sandy loam soil must be
purchased (find the volume of a rectangular object)? - SELECTED ANSWER 👀
**** 208.3 cubic yards
What would be the volume of a 5-foot-diameter pump tank that is 5 feet tall with
the inlet 1 foot below the rim? - SELECTED ANSWER 👀 **** 587 gals
What would be the percent slope on a lot 250 feet deep that drops 20 feet in
elevation over the depth of the lot? - SELECTED ANSWER 👀 **** 8%
How many cubic yards of gravel would be needed to fill a ditch 3 feet deep, 10
feet wide, and 12 feet long with 18 inches of gravel? 1 cubic yard = 27 cubic
feet. - SELECTED ANSWER 👀 **** 6.67 cubic yards
VERSION) (QUESTIONS + ANSWERS)
INSTANT PDF ACCESS AFTER PAYMENT
100% CORRECT!!
Two wastewater tests commonly used to measure the strength of sewage are
the ________ test and the ________ test. - SELECTED ANSWER 👀 **** BOD,
TSS
The minimum water usage rate that should be used for planning an OSSF for a
new home with three bedrooms and 3000 square feet of interior living area is
_______ gallons/day. - SELECTED ANSWER 👀 **** 300
Blockage in the home plumbing system is often caused by _______, ________,
and _________. - SELECTED ANSWER 👀 **** oils, greases, and fats
It is recommended that _____________ are not used because they significantly
increase the amount of suspended solids and organic matter that is discharged
to sewage disposal system. - SELECTED ANSWER 👀 **** garbage disposal
Several samples were taken from a small washateria with seven new water-
conserving machines and sent to a lab for BOD analysis. The average BOD was
406 mg/L. What would be the minimum expected BOD (organic) loading in
lbs./day? - SELECTED ANSWER 👀 **** 4.74 lbs/day
,Domestic wastewater contains microorganisms that are capable of causing
_________. - SELECTED ANSWER 👀 **** infectious diseases
An official inspector of a new OSSF is a(n) _______. - SELECTED ANSWER
👀 **** designated representative
A trench requires 430 cubic feet of gravel. How many cubic yards must be
purchased? - SELECTED ANSWER 👀 **** 16 cubic yards
A septic tank had a working volume of 31 cubic feet. How many gallons does
this septic tank hold? - SELECTED ANSWER 👀 **** approx. 232 gals
The area of a lot is 20,076 square feet. What is the area of this lot in acres? -
SELECTED ANSWER 👀 **** 0.46 acres
A trench measures 30 inches wide. How wide is the trench in feet? -
SELECTED ANSWER 👀 **** 2.5'
A particular hazard that OSSF installers face that most construction workers do
not is _______. - SELECTED ANSWER 👀 **** infectious waterborne diseases
_______ and ________ soil textural classes are always unsuitable for standard
absorptive OSSF - SELECTED ANSWER 👀 **** class IA and IV
List each of the major soil horizons - SELECTED ANSWER 👀 **** surface soil
A, surface soil B, and parent material
, _____________ is a term describing the ability of water to migrate through a soil
profile under either _________ or __________ conditions. - SELECTED
ANSWER 👀 **** Hydraulic conductivity, saturated, unsaturated
Interconnected pores in the soil profile allow ______ and _______ to enter the
soil at its surface and migrate downward - SELECTED ANSWER 👀 **** air,
water
List the four components of soil - SELECTED ANSWER 👀 **** air, water,
organics, inorganics
A drainfield is 50 feet by 90 feet and must be covered with an average of 15
inches of sand loam. How many cubic yards of sandy loam soil must be
purchased (find the volume of a rectangular object)? - SELECTED ANSWER 👀
**** 208.3 cubic yards
What would be the volume of a 5-foot-diameter pump tank that is 5 feet tall with
the inlet 1 foot below the rim? - SELECTED ANSWER 👀 **** 587 gals
What would be the percent slope on a lot 250 feet deep that drops 20 feet in
elevation over the depth of the lot? - SELECTED ANSWER 👀 **** 8%
How many cubic yards of gravel would be needed to fill a ditch 3 feet deep, 10
feet wide, and 12 feet long with 18 inches of gravel? 1 cubic yard = 27 cubic
feet. - SELECTED ANSWER 👀 **** 6.67 cubic yards
