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Texas OSSF Installer 1 Practice Test
2025/2026 – TCEQ Licensed Installer
Exam Prep Questions
The TCEQ - VERIFIED ANSWER Adopted the current OSSF rules on 1997 and revised then several times Designated Representative - VERIFIED ANSWER Is responsible for reviewing permit applications, site evaluations, planning, materials, and conducting inspections of OSSF's Installer - VERIFIED ANSWER An individual who holds a valid license from the TCEQ and who is compensated by another individual to construct, install, alter, or repair an OSSF Site Evaluator - VERIFIED ANSWER An individual who visits a site and conducts soil evaluations and site surveys Installer II & Maintenance Provider - VERIFIED ANSWER List the OSSF licenses that require previous experience Designated Representative (DR) ; authorized agent cannont - VERIFIED ANSWER Individuals working as an __________ or in any capacity for an OSSF _________ work as an Installer, Designer for a fee, or private Site Evaluator within the jurisdiction of the permitting authority. Submit an application, paying class and application fees, completing the appropriate training course - VERIFIED ANSWER What is needed to pre-qualifiy for an exam?
3 years; 24 hours - VERIFIED ANSWER New OSSF licenses are issued for a term of __________. An individual must complete _________ or TCEQ-Approved continuing education courses in order to renew the license
- Have site and soil evaluation conducted by Site Evaluator 2. Select OSSF 3. System planned by qualified individual 4. Prepare and submit permit application 5. Application and planning material reviewed by permitting authority 6. Recieve permit to construct 7. Construction 8. System inspected at appropriate stages 9. Notice of approval and permit to operate issued by permitting agency - VERIFIED ANSWER List the nine steps of permitting process. A. Criminal penalties B. Injuction or civil suit C. Administrative penalties - VERIFIED ANSWER Penalties for violating the law, rule, or regulations covering OSSF can be imposed under what headings? Professional Enigeer (PE) or Registered Sanatarian (RS) - VERIFIED ANSWER Multi hook up systems such as RV parks must be prepared by an? Installer II - VERIFIED ANSWER Who can legally install a septic tank followed by a low pressure dosing drainfield at a rental house? a. Cones, barricades, high-level flags b. Pre-warn c. sign properly d. regulate speed e. guide properly - VERIFIED ANSWER List equipment and procedures to protect a work site. Five - VERIFIED ANSWER OSHA requires that all excavations over _______ feet deep be sloped, shored, or otherwise supported before a person enters. Infectious waterborne diseases - VERIFIED ANSWER A particular hazard that OSSF installers face, that most construction workers do not experience is ________ On-site sewage disposal system, Agency/Commission, Authorized Agent, DR, Installer, Apprentice, Site Evaluator, Maintenance Provider, Maintenance Technician - VERIFIED ANSWER The following are key elements of thIn the hydrologic cycle, water moves by evaporation and transpiration into the ___________________ where it comes in contact with cooler air, condenses, and falls to the ground in the form of _____________________ (sleet, snow, hail or rain), and the surface water supply through _____________________. - VERIFIED ANSWER ATMOSPHERE, PRECIPITATION, RUNOFF
~Property values drop and real estate transactions fall through. No one benefits and everyone suffers when neighborhoods are fouled by waste water. Why is acceptable quality water vital? - VERIFIED ANSWER Sustains human life, the natural environment and the economic life of Texas Groundwater that is obtained via a well can be used for what purpose? - VERIFIED ANSWER Agricultural, industrial/commercial and drinking water. What is the difference between a water table aquifer and an artesian aquifer? - VERIFIED ANSWER Water table aquifer is in direct contact with either the soil or the intermediate belt. Artesian is overplayed by a layer of impervious material. What is the static water level? - VERIFIED ANSWER Level at which water stands in a well. What are the 2 categories of sources of pollutants in surface water? - VERIFIED ANSWER Point source pollution. Non-point source pollution. What is the difference between point source and nonpoint source pollution? - VERIFIED ANSWER Point source can be controlled, non point source has little or no control. Ground water quality is recognized as a minor problem in Texas. - VERIFIED ANSWER FALSE Cesspools and seepage pits are legal systems in Texas and may be installed. - VERIFIED ANSWER FALSE Bore holes and injection wells are legal in Texas and may be installed. - VERIFIED ANSWER FALSE Artesian aquifers can be contaminated by bore holes and injection wells. - VERIFIED ANSWER TRUE
In America, laws can be successfully enforced only when the majority of citizens voluntary comply. - VERIFIED ANSWER TRUE Home owners should be educated on the need for and importance of maintaining their OSSF system. - VERIFIED ANSWER TRUE Onsite sewage facilities (OSSF) have been regulated statewide since - VERIFIED ANSWER 1989 The state agency responsible for regulating OSSF systems is - VERIFIED ANSWER TCEQ (Texas Commission on Environmental Quality) The first regulation of OSSF systems in Texas was done by - VERIFIED ANSWER local governments The intent of the HB1875 law is that most of the regulation of OSSF systems be done by _____________ government. - VERIFIED ANSWER local An official inspector of OSSF systems is a - VERIFIED ANSWER (DR) Designated Representative A local government with the authority to regulate septic systems is termed an - VERIFIED ANSWER authorized agent A person legally constructing OSSF systems as a business is an______________ and must be licensed by __________. - VERIFIED ANSWER installer, TCEQ Penalties for violating OSSF regulations fall under the following headings: - VERIFIED ANSWER ~Criminal ~Civil ~Administrative A professional designer is either a ________________________ or a _______________________ with experience in the design of ___________ systems. - VERIFIED ANSWER Professional Engineer (PE), Registered Sanitarian (RS), OSSF
List eight examples of work clothes that are important personal protective equipment - VERIFIED ANSWER eye protection, hard hats, ear plugs, respiratory, gloves, foot & leg skin and clothing Criminal offenses are misdemeanors punishable in accordance with________________ of the Texas Water Code and ___________________ of the Texas Penal Code. - VERIFIED ANSWER Chapter 7, Chapter
Skin protection should be used to protect against ______________, and___________________injuries,__________________agents, ___________________), and __________________________________extremes. - VERIFIED ANSWER mechanical, physical, biological, chemical and temperature Which of the following is NOT an effective method for warning approaching traffic about a work site? - VERIFIED ANSWER construction equipment Which of the following is NOT a common cause of trench and excavation cave-ins? - VERIFIED ANSWER Sloping the sides of a cut to the "angle of repose" According to the Texas one-Call-Law, how far ahead must a person call a One Call Notification Center before digging 16 inches or deeper using mechanical equipment? - VERIFIED ANSWER 2 working days Which of the following is NOT a good hygienic practice to follow when working around waste water or septage? - VERIFIED ANSWER When washing work clothes with the family wash, remember to double rinse Workers exposed to wastewater need to consult their physician only about immunization to typhoid. - VERIFIED ANSWER False What are the potential hazards associated with working in a confined space? - VERIFIED ANSWER ~Lack of natural VENTALATION ~OXEGEN deficient atmosphere ~FLAMMABLE EXPLOSIVE atmosphere ~Unexpected release of hazardous ENERGY
~Dangerous concentrations of AIR CONTANAMENTS ~Physical BARRIERS or limitations to MOVEMENT ~INSTABILITY of stored products Over ___ of workers who die in confined spaces are attempting to recue other workers. - VERIFIED ANSWER 50% Which of the following is NOT a characteristic of confined space? - VERIFIED ANSWER Has natural air movement which provides a good quality atmosphere List the symptoms of asphyxiation. - VERIFIED ANSWER headache drowsiness dizziness nausia Which of the following characteristics is true of microorganisms? - VERIFIED ANSWER Important in the process of wastewater digestion Domestic wastewater contains microorganisms that are capable of causing______________. - VERIFIED ANSWER infection and infectious diseases Bacteria that causes diseases are called______________. - VERIFIED ANSWER pathogens Microorganisms in wastewater include__________________. - VERIFIED ANSWER bacteria, viruses, protozoa and helminths Waterborne diseases that spread by pathogenic bacteria include______________________________. - VERIFIED ANSWER typhoid, cholera, dysentery Protozoa are very simple organisms that may cause__________________. - VERIFIED ANSWER Amoebic dysentery and giardiasis
The factors influencing the survival of bacteria in soil are_________________. - VERIFIED ANSWER moisture, temperature, pH and organic matter The treatment device providing the least or poorest treatment of domestic wastewater would be the__________________. - VERIFIED ANSWER septic tank The disposal system that might be considered in a tight clay soil soil would be the_______________. - VERIFIED ANSWER drip or spray irrigation Which of the following criteria would NOT be an indication that the on-site system is working properly? - VERIFIED ANSWER Ninety-nine percent adequate treatment is attained before wastewater reaches ground water or surface water Adsorption is a mechanical process of soil that_______________. - VERIFIED ANSWER will occur in water with high hardness and neutral or slightly acidic pH The septic tank might better be termed a pretreatment process, since more treatment occurs in the ______. - VERIFIED ANSWER soil Standard disposal systems include all of the following except______________. - VERIFIED ANSWER gravelless pipe (proprietary) Nonstandard disposal systems include all of the following except______________. - VERIFIED ANSWER drip irrigation Which of the following statements regarding grease traps or interceptors is not true? - VERIFIED ANSWER Most solids found in these structures are settleable solids The only treatment a septic tank provides to household wastewater is separating the settleable and floatable suspended solids from the liquid - VERIFIED ANSWER False
Current regulations for an on-site disposal system require that all wastewater be absorbed into the soil.
- VERIFIED ANSWER False A suitable soil provides only biological treatment for septic tank effluent. - VERIFIED ANSWER False An evaluation of a lot for design and installation of a septic tank system should include the following - VERIFIED ANSWER a. lot size b. soil & geological conditions c. topography and slope d. setbacks e. flood hazards A very common reason for soil absorption system failures is inadequate_________________________. - VERIFIED ANSWER lot size When systems fail in urban or suburban areas, there is a serious threat of the spread of____________________________________. - VERIFIED ANSWER Water born diseases Lots served by individual wells should be a minimum of___________________ acre in size for a septic system. - VERIFIED ANSWER one Lots served by a public water supply shoild be a minumum of _____________________acre in size for a septic system. - VERIFIED ANSWER one half When minimum lot size cannot be met, an on-site system must be deigned by a _______________________________or a_________________________________. - VERIFIED ANSWER Registered professional engineer, registered sanitarian When evaluating a topography site,_________________ and potential for __________________ are key considerations. - VERIFIED ANSWER slope, flooding
Disease causing microorganisms that are passed into water through feces. - VERIFIED ANSWER Pathogens Any living thing too small to see with a naked eye. - VERIFIED ANSWER Microorganism Are from 10 too 100 times smaller than bacteria, can only function and reproduce in living cells. - VERIFIED ANSWER Viruses Single celled organisms. - VERIFIED ANSWER Bacteria are all different types of pathogens. - VERIFIED ANSWER Bacteria,Microorganism, and Viruses 8.34 pounds per gallon. - VERIFIED ANSWER The weight of wastewater. Physical, Chemical, Bacteriological. - VERIFIED ANSWER Three Main Areas of Wastewater. Total Suspended Solids - VERIFIED ANSWER TSS Total dissolved solids - VERIFIED ANSWER TDS Total Solids. - VERIFIED ANSWER TSS and TDS added together equal. TSS+TDS=TR - VERIFIED ANSWER Formula: Carbohydrates, proteins, fats. - VERIFIED ANSWER Organic Material Stabilizes first - VERIFIED ANSWER Carbs Are more difficult to stabilize. - VERIFIED ANSWER Proteins
Are the most difficult to stabilize. - VERIFIED ANSWER Fats Length x Width - VERIFIED ANSWER Area A=πr² - VERIFIED ANSWER Area Formula Length x Width x Height - VERIFIED ANSWER Volume V=πr² x H(height) - VERIFIED ANSWER Volume Formula Length x Width x Height x 7.48 - VERIFIED ANSWER Capacity C=πr²xHx7.48 - VERIFIED ANSWER Capacity Formula 50feet - VERIFIED ANSWER Public Water Wells from Tanks 150feet - VERIFIED ANSWER Public Water Wells from soil absorption systems, unlined et beds 150feet - VERIFIED ANSWER Public Water Wells from Lined Evapotranspiration. 50feet - VERIFIED ANSWER Public Water Wells Sewer pipe with water tight joints. 150feet - VERIFIED ANSWER Public Water Wells from Surface Application (Edge of Spray Area) 150feet - VERIFIED ANSWER Public Water Wells from Surface Application (Edge of Spray Area) 150feet - VERIFIED ANSWER Public Water Wells from Drip Irrigation
10 feet squared except at connection to structure - VERIFIED ANSWER Private Water Lines from Sewer Pipes with watertight joints No seperation distances. - VERIFIED ANSWER Private Water Lines from Surface application (Edge of Spray Area) 10 feet - VERIFIED ANSWER Private Water Lines from Drip Irrigation lines 50 feet - VERIFIED ANSWER Pressure Cemented Wells from tanks 50 feet - VERIFIED ANSWER Pressure Cemented Wells from soil absorption systems & unlined ET beds 50 feet - VERIFIED ANSWER Pressure Cemented Wells from Lined evapotranspiration beds 20 feet - VERIFIED ANSWER Pressure Cemented Wells from sewer pipes with watertight joints 50 feet - VERIFIED ANSWER Pressure Cemented Wells from Surface Application (edge of spray area) 50 feet - VERIFIED ANSWER Pressure Cemented Wells from drip irrigation lines 50 feet - VERIFIED ANSWER Streams,Ponds,Lakes, Rivers, Creeks(Measured from normal pool elevation and Water level) from tanks 75 feet - VERIFIED ANSWER Streams,Ponds,Lakes, Rivers, Creeks(Measured from normal pool elevation and Water level) from soil absorption systems & unlined ET beds 50 feet - VERIFIED ANSWER Streams,Ponds,Lakes, Rivers, Creeks(Measured from normal pool elevation and Water level) from lined evapotranspiration beds
20 feet - VERIFIED ANSWER Streams,Ponds,Lakes, Rivers, Creeks(Measured from normal pool elevation and Water level) from sewer pipes with watertight joints 50 feet - VERIFIED ANSWER Streams,Ponds,Lakes, Rivers, Creeks(Measured from normal pool elevation and Water level) from surface application (Edge of spray Area) 25 feet - VERIFIED ANSWER Streams,Ponds,Lakes, Rivers, Creeks(Measured from normal pool elevation and Water level) from drip irrigation when Ra<0. 75 feet - VERIFIED ANSWER Streams,Ponds,Lakes, Rivers, Creeks(Measured from normal pool elevation and Water level) from drip irrigation when Ra>0. 50 feet - VERIFIED ANSWER Streams,Ponds,Lakes, Rivers, Creeks(Measured from normal pool elevation and Water level) from drip irrigation with secondary treatment and disinfection 5 feet - VERIFIED ANSWER Foundations, Buildings, Surface Improvements,Property Lines, Swimming Pools and Other structures from tanks 5 feet - VERIFIED ANSWER Foundations, Buildings, Surface Improvements,Property Lines, Swimming Pools and Other structures from soil adsorption systems & unlined ET beds 5 feet - VERIFIED ANSWER Foundations, Buildings, Surface Improvements,Property Lines, Swimming Pools and Other structures from Lined evapotranspiration beds 5 feet - VERIFIED ANSWER Foundations, Buildings, Surface Improvements,Property Lines, Swimming Pools and Other structures from sewer pipes with watertight joints may run underneath if SCH 80 or sleeved - VERIFIED ANSWER Foundations, Buildings, Surface Improvements,Property Lines, Swimming Pools and Other structures (sewer pipes)from driveways and sidewalks
1 foot unless permission has been granted then none - VERIFIED ANSWER Overhead easements from soil absorption systems & unlined beds 1 foot unless permission has been granted - VERIFIED ANSWER Overhead easements from lined ET beds 1 foot unless permission has been granted - VERIFIED ANSWER Overhead easements from sewer pipes with watertight joints 1 foot unless permission has been granted - VERIFIED ANSWER Overhead easements from surface application 1 foot unless permission has been granted - VERIFIED ANSWER Overhead easements from drip irrigation 5 feet - VERIFIED ANSWER Slopes where seeps may occur and detention ponds from tanks 25 feet - VERIFIED ANSWER Slopes where seeps may occur and detention ponds from soil absorption systems & unlined ET beds 5 feet - VERIFIED ANSWER Slopes where seeps may occur and detention ponds from lined ET beds 10 feet - VERIFIED ANSWER Slopes where seeps may occur and detention ponds from sewer pipe with watertight joints 10 feet - VERIFIED ANSWER Slopes where seeps may occur and detention ponds from surface application(Edge of spray area) 10 feet - VERIFIED ANSWER Slopes where seeps may occur and detention ponds from drip irrigation with Ra<0. 25 feet - VERIFIED ANSWER Slopes where seeps may occur and detention ponds from drip irrigation with Ra>0.
50 feet - VERIFIED ANSWER Edwards Aquifer from tanks 150 feet - VERIFIED ANSWER Edwards Aquifer from soil absorption systems & unlined ET beds 50 feet - VERIFIED ANSWER Edwards Aquifer from lined evapotranspiration beds 50 feet - VERIFIED ANSWER Edwards Aquifer from sewer pipes with water tight joints 150 feet - VERIFIED ANSWER Edwards Aquifer from surface application(Edge of spray area) 100 feet - VERIFIED ANSWER Edwards Aquifer from drip irrigation when Ra<0. 150 feet - VERIFIED ANSWER Edwards Aquifer from drip irrigation when Ra>0. inorganic matter, organic matter, water, and air - VERIFIED ANSWER Four major components of soil classified by structure - VERIFIED ANSWER Class 3 soils is considered unsuitable - VERIFIED ANSWER class 4 soils are considered suitable for standard systems based on texture. - VERIFIED ANSWER classes 1b and 2 suitable, blocky, columnar or prismatic, granular, unsuitable, massive,platy - VERIFIED ANSWER class 3 soil structure 40 pounds per square inch - VERIFIED ANSWER Maximum inlet pressure for sprinklers 15 degrees - VERIFIED ANSWER Maximum spray nozzel trajectory
