OSSF DR COMPREHENSIVE STUDY GUIDE 2026 FULL
QUESTIONS AND SOLUTIONS GRADED A+
● Onsite Sewage Facility. Answer: One or more systems of treatment tanks, pumps, piping,
soil absorption systems, and other components used to treat and dispose of sewage at or
near the point of waste generation
● Low Pressure Pipe System. Answer: Distribution method using small diameter perforated
pipe with closely spaced holes operating under low pressure to achieve uniform distribution
across absorption area
● Pumper Truck. Answer: Specialized vehicle with vacuum equipment and tank for removing
and transporting septage from septic tanks to treatment or disposal facilities
● As-Built Drawing. Answer: Final documentation showing actual installed locations,
dimensions, and specifications of OSSF components as constructed in field
● Percolation Test. Answer: Field test performed by filling excavated holes with water and
measuring the time required for water to seep into surrounding soil to determine soil
absorption capabilities
● Monitoring Port. Answer: Access point for measuring liquid levels, collecting samples, or
observing system operation without disturbing main components
● Aerobic Treatment Unit. Answer: Mechanical system that introduces oxygen into
wastewater to promote aerobic bacterial growth for enhanced organic matter decomposition
and effluent quality improvement
● Designated Representative. Answer: Individual certified to plan, design, inspect, and
oversee onsite sewage facility systems installation and operation in accordance with state and
local regulations
● Site Plan. Answer: Scaled drawing showing property boundaries, structures, OSSF
components, wells, surface water, easements, and other features with dimensions and
setbacks
● Building Setback. Answer: Minimum required distance from OSSF components to
structures protecting occupants from odors and contamination while allowing system access
, ● Water Table. Answer: Upper surface of saturated zone where soil pores are filled with
water, fluctuating seasonally with precipitation and evapotranspiration
● Proprietary System. Answer: Commercially manufactured OSSF components or complete
systems requiring testing, certification, and listing by TCEQ before installation approval
● Access Port. Answer: Opening in septic tank or other component allowing entry for
inspection, maintenance, sampling, or pumping operations
● Secondary Treatment. Answer: Additional biological treatment beyond septic tank using
aerobic processes in systems such as aerobic treatment units to achieve higher organic
matter and pathogen removal
● Installer License. Answer: Required TCEQ authorization for individuals who construct,
alter, extend, or repair onsite sewage facilities ensuring competency and regulatory
knowledge
● Treatment Level. Answer: Classification of sewage treatment capability ranging from
primary (septic tank only) to secondary (additional biological treatment) to advanced (nutrient
removal or disinfection)
● Dosing System. Answer: Pressurized distribution method using pump and controls to
deliver measured volumes of effluent to absorption area at timed intervals for improved
distribution and treatment
● Licensed Installer. Answer: Individual holding valid TCEQ license to perform OSSF
construction meeting training, testing, and experience requirements
● OSF. Answer: Abbreviation for Onsite Sewage Facility used to describe decentralized
wastewater treatment systems
● LPP. Answer: Acronym for Low Pressure Pipe distribution system providing better effluent
distribution than gravity systems
● Pump Tank. Answer: Watertight chamber receiving septic tank effluent and housing
submersible pump and controls for delivering wastewater to elevated or pressurized
distribution systems
● Construction Permit. Answer: Written TCEQ authorization allowing OSSF installation to
proceed based on approved plans and site suitability determination
● Lift Station. Answer: Pumping facility that elevates wastewater from lower elevation to
higher point when gravity flow is not feasible due to site topography
QUESTIONS AND SOLUTIONS GRADED A+
● Onsite Sewage Facility. Answer: One or more systems of treatment tanks, pumps, piping,
soil absorption systems, and other components used to treat and dispose of sewage at or
near the point of waste generation
● Low Pressure Pipe System. Answer: Distribution method using small diameter perforated
pipe with closely spaced holes operating under low pressure to achieve uniform distribution
across absorption area
● Pumper Truck. Answer: Specialized vehicle with vacuum equipment and tank for removing
and transporting septage from septic tanks to treatment or disposal facilities
● As-Built Drawing. Answer: Final documentation showing actual installed locations,
dimensions, and specifications of OSSF components as constructed in field
● Percolation Test. Answer: Field test performed by filling excavated holes with water and
measuring the time required for water to seep into surrounding soil to determine soil
absorption capabilities
● Monitoring Port. Answer: Access point for measuring liquid levels, collecting samples, or
observing system operation without disturbing main components
● Aerobic Treatment Unit. Answer: Mechanical system that introduces oxygen into
wastewater to promote aerobic bacterial growth for enhanced organic matter decomposition
and effluent quality improvement
● Designated Representative. Answer: Individual certified to plan, design, inspect, and
oversee onsite sewage facility systems installation and operation in accordance with state and
local regulations
● Site Plan. Answer: Scaled drawing showing property boundaries, structures, OSSF
components, wells, surface water, easements, and other features with dimensions and
setbacks
● Building Setback. Answer: Minimum required distance from OSSF components to
structures protecting occupants from odors and contamination while allowing system access
, ● Water Table. Answer: Upper surface of saturated zone where soil pores are filled with
water, fluctuating seasonally with precipitation and evapotranspiration
● Proprietary System. Answer: Commercially manufactured OSSF components or complete
systems requiring testing, certification, and listing by TCEQ before installation approval
● Access Port. Answer: Opening in septic tank or other component allowing entry for
inspection, maintenance, sampling, or pumping operations
● Secondary Treatment. Answer: Additional biological treatment beyond septic tank using
aerobic processes in systems such as aerobic treatment units to achieve higher organic
matter and pathogen removal
● Installer License. Answer: Required TCEQ authorization for individuals who construct,
alter, extend, or repair onsite sewage facilities ensuring competency and regulatory
knowledge
● Treatment Level. Answer: Classification of sewage treatment capability ranging from
primary (septic tank only) to secondary (additional biological treatment) to advanced (nutrient
removal or disinfection)
● Dosing System. Answer: Pressurized distribution method using pump and controls to
deliver measured volumes of effluent to absorption area at timed intervals for improved
distribution and treatment
● Licensed Installer. Answer: Individual holding valid TCEQ license to perform OSSF
construction meeting training, testing, and experience requirements
● OSF. Answer: Abbreviation for Onsite Sewage Facility used to describe decentralized
wastewater treatment systems
● LPP. Answer: Acronym for Low Pressure Pipe distribution system providing better effluent
distribution than gravity systems
● Pump Tank. Answer: Watertight chamber receiving septic tank effluent and housing
submersible pump and controls for delivering wastewater to elevated or pressurized
distribution systems
● Construction Permit. Answer: Written TCEQ authorization allowing OSSF installation to
proceed based on approved plans and site suitability determination
● Lift Station. Answer: Pumping facility that elevates wastewater from lower elevation to
higher point when gravity flow is not feasible due to site topography
