1|Page
OSSF INSTALLER 2 EXAM 2025 | ALL QUESTIONS
AND CORRECT ANSWERS (VERIFIED ANSWERS) |
LATEST EXAM | ALREADY GRADED A+
______should NOT be allowed over the OSSF treatment unit or
drainfield
a . Vegetation
b . Mowing
c . Earth fill
d . Rainfall runoff - . . ANSWER ✓✓ d . Rainfall runoff
_____adopted the current OSSF Rules in 1997 and revised them
several times . - . . ANSWER ✓✓ TCEQ
A ______ is a disease-causing microorganism - . . ANSWER ✓✓
Pathogen
A ____________of __________shall be placed on top op the porous
media before backfilling - . . ANSWER ✓✓ Permeable barrier
geo fabric
,2|Page
A drip irrigation system must
a . not be installed in Class IV soils
b . be installed at a minimum depth of 18 in .
c . have pressures adjusted to less than 10 psi on distribution
lines
d . be equipped with mechanisms to flush from the drainfield
back to the treatment unit - . . ANSWER ✓✓ d . be equipped with
mechanisms to flush from the drainfield back to the treatment
unit
A groundwater chemical contaminant that can result from septic
tanks and leachfields is which can cause_____in infants - . .
ANSWER ✓✓ Nitrates and methoemoglobinmia
A legal maintenance company for a surface application OSSF
system using proprietary aerobic plant must have an employee
who is which of the following ?
a . A licensed maintenance provider b . A registered maintenance
technician
c . A registered installer and maintenance technician
d . A registered installer or class D wastewater operator - . .
ANSWER ✓✓ a . A licensed maintenance provider
A major reason for wastewater system failure is
a homeowner waste
, 3|Page
b . inadequate planning
c . hydraulic overloading
d . oils grease and fats - . . ANSWER ✓✓ c . hydraulic
overloading grease
A mound or soil substitution drainfield often used
a . In wetland areas
b . Without treatment
c . In conjunction with secondary treatment
d.When existing soils will not provide adequate treatment due to
depth or texture - . . ANSWER ✓✓ d . When existing soils will not
provide adequate treatment due to depth or texture
A very common reason for soil absorption system failures is
inadequate - . . ANSWER ✓✓ lot Size
An important part of the installation of an LPD system is
a . checking and adjusting pressure on lines
b.rigidly stabilizing each line as gravel is placed
c . the installation of at least one inspection port per line
d.the precise grade on the dosing pipe ( 1 in . fall / 100 feet ) - . .
ANSWER ✓✓ a . checking and adjusting pressure on lines
OSSF INSTALLER 2 EXAM 2025 | ALL QUESTIONS
AND CORRECT ANSWERS (VERIFIED ANSWERS) |
LATEST EXAM | ALREADY GRADED A+
______should NOT be allowed over the OSSF treatment unit or
drainfield
a . Vegetation
b . Mowing
c . Earth fill
d . Rainfall runoff - . . ANSWER ✓✓ d . Rainfall runoff
_____adopted the current OSSF Rules in 1997 and revised them
several times . - . . ANSWER ✓✓ TCEQ
A ______ is a disease-causing microorganism - . . ANSWER ✓✓
Pathogen
A ____________of __________shall be placed on top op the porous
media before backfilling - . . ANSWER ✓✓ Permeable barrier
geo fabric
,2|Page
A drip irrigation system must
a . not be installed in Class IV soils
b . be installed at a minimum depth of 18 in .
c . have pressures adjusted to less than 10 psi on distribution
lines
d . be equipped with mechanisms to flush from the drainfield
back to the treatment unit - . . ANSWER ✓✓ d . be equipped with
mechanisms to flush from the drainfield back to the treatment
unit
A groundwater chemical contaminant that can result from septic
tanks and leachfields is which can cause_____in infants - . .
ANSWER ✓✓ Nitrates and methoemoglobinmia
A legal maintenance company for a surface application OSSF
system using proprietary aerobic plant must have an employee
who is which of the following ?
a . A licensed maintenance provider b . A registered maintenance
technician
c . A registered installer and maintenance technician
d . A registered installer or class D wastewater operator - . .
ANSWER ✓✓ a . A licensed maintenance provider
A major reason for wastewater system failure is
a homeowner waste
, 3|Page
b . inadequate planning
c . hydraulic overloading
d . oils grease and fats - . . ANSWER ✓✓ c . hydraulic
overloading grease
A mound or soil substitution drainfield often used
a . In wetland areas
b . Without treatment
c . In conjunction with secondary treatment
d.When existing soils will not provide adequate treatment due to
depth or texture - . . ANSWER ✓✓ d . When existing soils will not
provide adequate treatment due to depth or texture
A very common reason for soil absorption system failures is
inadequate - . . ANSWER ✓✓ lot Size
An important part of the installation of an LPD system is
a . checking and adjusting pressure on lines
b.rigidly stabilizing each line as gravel is placed
c . the installation of at least one inspection port per line
d.the precise grade on the dosing pipe ( 1 in . fall / 100 feet ) - . .
ANSWER ✓✓ a . checking and adjusting pressure on lines
