Texas On-Site Sewage Facilities (OSSF),
OSSF DR TEST PRACTICE & Study Questions
Comprehensive Resource To Help You Ace
2026-2027 Includes Frequently Tested
Questions With ELABORATED 100% Correct
COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!!
Current Update!!
1. Alkalinity - ANSWER refers to a wastewater's ability, or inability, to
neutralize acids.
2. Ammonia - ANSWER is a compound of nitrogen and hydrogen with the
formula NH3. The main uses of ammonia are in the production of fertilizers,
and it is also an ingredient in certain household glass cleaners. The form of
nitrogen in septic tanks is ammonium.
3. Anaerobic - ANSWER is a condition in which there is no oxygen present.
Anaerobic organisms get their oxygen supply by breaking down chemical
compounds that contain oxygen.
4. Aquifer - ANSWER is a geological formation that can store, transmit, and
yield water to a well or spring.
,5. Assimilation - ANSWER is the transformation of a nutrient into another
form that can be digested by an organism.
6. Acceptable - ANSWER is a condition in which a component is
performing its intended purpose and is considered to be in an operable
state.
7. Adsorption - ANSWER allows contaminants in wastewater to bond with
media particles to slow the rate of movement through the media and to
allow uptake of nutrients by plants and microorganisms in the media.
8. Aerobic - ANSWER is a condition where oxygen is required. Aerobic
microorganisms require oxygen to live and breakdown pathogens in
wastewater.
9. Biochemical - ANSWER is a treatment process that combines biological
treatment and chemical treatment. The two processes overlap and
sometimes it is hard to distinguish which treatment activities are biological
and which are chemical.
10.Biochemical Oxygen Demand (BOD5) - ANSWER is the amount of
oxygen consumed by microbes during the decomposition of organic matter.
It is an indicator of the overall strength of the wastewater.
,11.Biological oxidation - ANSWER occurs when bacteria break down
organic matter into water and carbon dioxide (CO2). Oxidation reduces
BOD5, removes pathogens, and works best under aerobic conditions.
12.Biological processes - ANSWER for treatment include natural die-off,
predation, biological oxidation, and mineralization.
13.biomat - ANSWER A ______is the biological buildup of wastewater
treating organisms on a treatment media.
14.Blackwater - ANSWER includes flush water from toilets and urinals and
wastewater from food preparation sinks. Blackwater contains relatively
higher concentrations of nitrogen and human pathogens than graywater
and decomposes more slowly.
15.Cation exchange - ANSWER allows contaminants in wastewater to bond
with media particles to slow the rate of movement through the media and
to allow uptake of nutrients by plants and microorganisms in the media.
16.Chemical Oxygen Demand (COD) - ANSWER is a measure of the amount
of organic matter oxidized by a strong chemical oxidant.
17.Chemical processes - ANSWER that can treat wastewater include cation
exchange, adsorption, and precipitation.
, 18.Chlorine residual - ANSWER is the total amount of chlorine remaining in
effluent at the end of a specified contact time following chlorination.
19.Clean water - ANSWER is water that never comes into contacts with
humans but that is discharged into the wastewater stream. Clean water
sources include condensate from ice-machine drains, condensate from air
conditioners and coolers, footing drains or basement drains, and water
treatment devices such as water softeners, reverse osmosis units and anion
exchange processes.
20.Compensation - ANSWER is the action of being paid a fair price for a
proper service.
21.Contact time - ANSWER is the time in which effluent is in contact with a
reacting chemical or constituent.
22.Demand-dosed - ANSWER systems deliver wastewater to the next
component in the treatment train when the wastewater becomes available.
A pump activates when a pre-determined volume of effluent flows into the
pump tank. The flow patterns to the next component are subject to the
variations in water usage patterns from the source
23.Denitrification - ANSWER is the process in which nitrates are
transformed to gaseous nitrogen. Denitrification occurs in anaerobic
conditions.
OSSF DR TEST PRACTICE & Study Questions
Comprehensive Resource To Help You Ace
2026-2027 Includes Frequently Tested
Questions With ELABORATED 100% Correct
COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!!
Current Update!!
1. Alkalinity - ANSWER refers to a wastewater's ability, or inability, to
neutralize acids.
2. Ammonia - ANSWER is a compound of nitrogen and hydrogen with the
formula NH3. The main uses of ammonia are in the production of fertilizers,
and it is also an ingredient in certain household glass cleaners. The form of
nitrogen in septic tanks is ammonium.
3. Anaerobic - ANSWER is a condition in which there is no oxygen present.
Anaerobic organisms get their oxygen supply by breaking down chemical
compounds that contain oxygen.
4. Aquifer - ANSWER is a geological formation that can store, transmit, and
yield water to a well or spring.
,5. Assimilation - ANSWER is the transformation of a nutrient into another
form that can be digested by an organism.
6. Acceptable - ANSWER is a condition in which a component is
performing its intended purpose and is considered to be in an operable
state.
7. Adsorption - ANSWER allows contaminants in wastewater to bond with
media particles to slow the rate of movement through the media and to
allow uptake of nutrients by plants and microorganisms in the media.
8. Aerobic - ANSWER is a condition where oxygen is required. Aerobic
microorganisms require oxygen to live and breakdown pathogens in
wastewater.
9. Biochemical - ANSWER is a treatment process that combines biological
treatment and chemical treatment. The two processes overlap and
sometimes it is hard to distinguish which treatment activities are biological
and which are chemical.
10.Biochemical Oxygen Demand (BOD5) - ANSWER is the amount of
oxygen consumed by microbes during the decomposition of organic matter.
It is an indicator of the overall strength of the wastewater.
,11.Biological oxidation - ANSWER occurs when bacteria break down
organic matter into water and carbon dioxide (CO2). Oxidation reduces
BOD5, removes pathogens, and works best under aerobic conditions.
12.Biological processes - ANSWER for treatment include natural die-off,
predation, biological oxidation, and mineralization.
13.biomat - ANSWER A ______is the biological buildup of wastewater
treating organisms on a treatment media.
14.Blackwater - ANSWER includes flush water from toilets and urinals and
wastewater from food preparation sinks. Blackwater contains relatively
higher concentrations of nitrogen and human pathogens than graywater
and decomposes more slowly.
15.Cation exchange - ANSWER allows contaminants in wastewater to bond
with media particles to slow the rate of movement through the media and
to allow uptake of nutrients by plants and microorganisms in the media.
16.Chemical Oxygen Demand (COD) - ANSWER is a measure of the amount
of organic matter oxidized by a strong chemical oxidant.
17.Chemical processes - ANSWER that can treat wastewater include cation
exchange, adsorption, and precipitation.
, 18.Chlorine residual - ANSWER is the total amount of chlorine remaining in
effluent at the end of a specified contact time following chlorination.
19.Clean water - ANSWER is water that never comes into contacts with
humans but that is discharged into the wastewater stream. Clean water
sources include condensate from ice-machine drains, condensate from air
conditioners and coolers, footing drains or basement drains, and water
treatment devices such as water softeners, reverse osmosis units and anion
exchange processes.
20.Compensation - ANSWER is the action of being paid a fair price for a
proper service.
21.Contact time - ANSWER is the time in which effluent is in contact with a
reacting chemical or constituent.
22.Demand-dosed - ANSWER systems deliver wastewater to the next
component in the treatment train when the wastewater becomes available.
A pump activates when a pre-determined volume of effluent flows into the
pump tank. The flow patterns to the next component are subject to the
variations in water usage patterns from the source
23.Denitrification - ANSWER is the process in which nitrates are
transformed to gaseous nitrogen. Denitrification occurs in anaerobic
conditions.
