North Carolina Septic Inspector Exam 2 Practice Test

These questions are part of the practice quiz. Start practicing

• Which wetness condition yields a PROVISIONALLY SUITABLE classification?
• During site evaluation, which factor is considered to determine if a conventional drainfield is appropriate?
• In NC septic system terminology, what defines an 'alternative system'?
• What term describes floating fats and oils at the top of a septic tank?
• How should an inspector handle incidental discovery of hazardous materials near a septic system?
• Which soil group corresponds to LTAR range 1.2 - 0.8 gpd/ft2?
• Why is an effluent screen or effluent filter important in septic systems?
• Which component may be present in a drainfield system besides the septic tank?
• Under what conditions is a mound system typically considered over a conventional drainfield?
• A soil wetness condition determined by observation or indication of lateral water movement within 48 inches of the naturally occurring soil surface shall be considered what?
• Which are examples of alternative septic systems?
• Which conditions might justify selecting a mound system over a conventional drainfield?
• What type of pipes are used in distribution within the drainfield?
• What should be included in an inspector’s site conditions assessment?
• How would you handle a scenario where the drainfield shows wet soil but no odor?
• In an inspection, what is the importance of noting the presence of filter screens on the outlet?
• Which statement correctly pairs a feature with its required minimum distance reference?
• What is the minimum horizontal distance between a sanitary sewage treatment and disposal system and streams classified as WS-I?
• What is the role of a dosing tank in a pressure-dosed drainfield system?
• Which statement about septic tank access openings is accurate when the tank has two compartments?
• Sites where soil wetness conditions are less than 36 inches below the naturally occurring soil surface are considered what with respect to soil wetness?
• Which soil group is associated with Sand/Loamy Sand?
• How can you determine if a drainfield soil is suitable for attenuation of wastewater?
• Which item is not typically included in an on-site septic system description in an inspection report?
• In site environmental protection, what is a key reason to consider when a septic system is near surface water?
• BLOCK-Like Soil Structure - Block-Like Soil Structure with peds 2.5 cm (1 inch) or less in size shall be considered _______________________________ as to structure.
• What documentation item in an inspection report is most likely to guide maintenance decisions?
• Which soil group is associated with Sandy Loam/Loam?
• Why is groundwater proximity an important consideration in septic system placement?
• How do drought conditions typically affect a septic system's infiltrative capacity?
• For Type 6 systems, which option describes a valid inspection schedule?
• A designated wetland shall be considered ______________ with respect to landscape position unless approved in writing by the U.S. Army Corps of Engineers or the North Carolina Division of Coastal Management.
• What is the difference between a septic tank and a grease interceptor?
• Type 4 systems: true or false — inspections occur twice per year and reporting occurs annually.
• What is the importance of marking and documenting access paths to subsurface components?
• Which signs might indicate insufficient or irregular maintenance of a system?
• SOIL GROUP I - Sandy Texture Soils. The sandy group includes the sand and loamy sand soil textural classes and shall be considered ________________________ with respect to texture.
• What is the minimum distance from any permanent storm water retention pond to the flood pool elevation?
• Which soil type is generally considered UNSUITABLE?
• What is the primary purpose of maintenance contracts or service agreements for septic systems?
• If a tank has three inlet openings, how are they arranged?
• Slopes greater than 65 percent shall ___________________________ reclassified as PROVISIONALLY SUITABLE.
• Block-Like Soil Structure with peds greater than 2.5 cm (1 inch) in size within 36 inches of the naturally occurring soil surface shall be considered __________________ as to structure.
• Which statement best describes soils that are predominantly 2:1 clay minerals (including mixed mineralogy clays) in terms of clay mineralogy?
• What is the inspection and reporting frequency for Type 1, Type 2, and Type 3 systems?
• Partition distance from the inlet end must be within which range of the tank length?
• How should a septic inspector handle safety around electrical components or pumps?
• What is the minimum liquid depth in a septic tank?
• What is the purpose of an effluent filter and where is it located?
• Which soil texture group includes sandy loam and loam soil textural classes?
• What is the inspection and reporting frequency for Type 4 systems?
• Which component is commonly used to elevate the drainfield in high groundwater situations?
• How does a sand filter system differ from a typical drainfield in terms of operation?
• When might a pumping truck be required at a property?
• What documentation is typically required in a septic inspection report?
• How often are residential septic tanks commonly pumped under typical usage?
• The inlet pipe in the tank shall be a:
• What is the term for the liquid that exits the septic tank to the drainfield?
• What is the role of professional ethics in septic inspections?
• Before entering a septic tank for sampling, which practice is essential?
• What is the function of a dosing device in a septic system?
• For Type 5 systems, which of the following describes a valid inspection schedule?
• How does a mound system differ from a conventional drainfield?
• What is the reporting frequency that applies to all Type 5 systems?
• When should a septic system be pumped out, and who should perform the work?
• How should a buried cleanout be handled during an inspection?
• During inspection, what is the purpose of verifying permits or as-built drawings?
• Block-Like Soil Structure with peds 1 inch or smaller is considered what as to structure?
• Which agencies regulate the disposal of septage and sludge waste in North Carolina?
• What safety precautions should inspectors take when opening septic tank lids?
• Which statement best emphasizes the ongoing need to document access for subsurface components during future services?
• Which option is NOT typically retained as part of the septic inspection records?
• What is hydraulic loading rate?
• How can seasonal conditions affect septic system performance and inspection findings?
• SOIL GROUP II - Coarse Loamy Texture Soils. The coarse loamy group includes sandy loam and loam soil textural classes and shall be considered __________________________ with respect to texture.
• Why is recordkeeping and documentation essential for septic inspectors?
• Which action best aligns with professional practice when encountering an undocumented septic system installation?
• What is the primary purpose of the site evaluation during a septic system inspection?
• Who typically serves as the operator for Type 1, Type 2, and Type 3 septic systems?
• What is the function of the septic tank baffle?
• Why is it important to keep children and pets away from open septic tanks during inspection?
• From which pool elevation is the minimum distance to a permanent storm water retention pond measured?
• What environmental concerns should inspectors consider regarding septic systems near wells and surface water?
• Depressions shall be considered _____________ with respect to landscape position except when the site complies essentially with the requirements of this Section and is approved by the local health department.
• How should a septic inspector address a potential violation of regulations observed on-site?
• Organic soils shall be considered what with respect to soil structure?
• What is the minimum distance from any other lake or pond to the flood pool elevation?
• Why is locating the system precisely important before any work, and what items should be recorded?
• What is the typical purpose of a distribution box in a septic system?
• Which soil group is associated with Sandy Clay Loam / Silt Loam / Clay Loam / Silty Clay Loam / Silt?
• Which statement best describes the role of odor observations during septic inspections?
• Sites where soil wetness conditions are greater than 48 inches below the naturally occurring soil surface are considered what with respect to soil wetness?
• What is the minimum required freeboard (air space between the top of the liquid and the tank lid)?
• Soils with predominantly 1:1 clay minerals and loose to friable moist consistence are considered what regarding clay mineralogy?
• SOIL GROUP III - Fine Loamy Texture Soils. The fine loamy group includes silt, silt loam, sandy clay loam, clay loam, and silty clay loam textural classes and shall be considered ______________________________ with respect to texture.
• Within 36 inches of the surface, prismatic structure is considered what with respect to structure?
• Which condition allows slopes greater than 30 percent to be reclassified as PROVISIONALLY SUITABLE?
• What is an important safety consideration when inspecting or servicing septic tanks?
• When inspecting near wells or surface water, which practice is essential to prevent cross-contamination?
• How should an inspector document any observed hydraulic overloading of a drainfield?
• When a high groundwater table is present, which septic design feature is commonly used to prevent effluent from surface drainage?
• What is the purpose of a vent stack or vent pipe in a septic system?
• What is the typical purpose of a leach or drainfield trench?
• What is the correct order of the layers in a typical septic tank from bottom to top?
• The length of a septic tank shall be at least:
• Which of the following is NOT a factor that influences the service life of a drainfield?
• What is an as-built drawing in a septic system context, and why is it important for inspections?
• In what situations is an alternative treatment unit (ATU) commonly installed?
• What is the role of licensed haulers in North Carolina septic waste management?
• If a site is UNSUITABLE with respect to structure or clay mineralogy, it may be reclassified after an investigation as what?
• Which item is NOT typically required to be retained for septic inspection records?
• Which maintenance action is most directly linked to extending drainfield life?
• What is the function of a vent pipe in septic systems?
• What is the reporting frequency for Type 6 systems?
• Under what site conditions might a mound system be recommended as an alternative to a conventional drainfield?
• What distinguishes a conventional septic system from an alternative system like a sand filter?
• Slopes greater than 30 percent may be reclassified as what after an investigation indicates that a modified system may be installed in accordance with Rule .1956?
• If odors are present but there is no visible wet soil or surface drainage, what is the most appropriate action?
• What is the function of a cleanout access in a septic system?
• CRUMB AND GRANULAR SOIL STRUCTURE - Soils which have crumb or granular structure shall be considered _______________as to structure.
• What is the relationship between septic tank pumping and drainfield longevity?
• When a potential regulatory violation is observed, to whom should the inspector refer remediation?
• What is a mound system and when is it used?
• Which soil group corresponds to LTAR range 0.4 - 0.1 gpd/ft2?
• Which LTAR range is associated with Soil Group II (Sandy Loam/Loam)?
• Access openings for a septic tank should have a minimum opening of:
• A sanitary sewage system must be located at least how far from the normal pool elevation of a Class I or II reservoir?
• If effluent is to be conveyed under areas subject to vehicular traffic, what pipe should be used?
• What does a high sludge or scum layer indicate in a septic tank, and what action is typically required?
• What is the minimum distance from any other stream, canal, marsh, or other surface waters?
• Uniform slopes between 15 percent and 30 percent shall be considered what with respect to topography?
• The water passage slot in the partition of a septic tank must be left at what height for the full width of the tank?
• Why might a drainfield owner schedule regular pumping of the septic tank?
• What is the purpose of a distribution or drop box in an onsite system?
• Which components are typically found in a conventional septic system?
• What is the purpose of monitoring wells or observation wells near septic fields?
• There shall be how many inlet openings in the tank, with how arranged?
• What is the minimum distance from other coastal waters to the mean high-water mark?
• Which system feature is typically used when a gravity-fed drainfield is not feasible due to site constraints?
• When performing a cause-and-effect assessment, what indicators would suggest a drainfield failure?
• Which statement best describes the primary purpose of a grease interceptor in a septic-related system?
• Why is it important to review as-built drawings or permit records during the inspection?
• What is the primary purpose of the septic tank in a conventional on-site wastewater system?
• What distinguishes a lip or shallow drainfield from deeper trenches?
• Which of the following is NOT a typical sign indicating drainfield failure?
• Why must the partition top terminate to leave space for air or gas passage between compartments?
• If you encounter a drainfield issue on site and cannot determine whether soil limitations or equipment failure is to blame, what is the best next step?
• Define design flow in septic system terms.
• Why is it important to review system records during an inspection?
• If a site is UNSUITABLE with respect to structure or clay mineralogy, it may be reclassified provisionally suitable after investigation in accordance with Rule .1956 or Rule .1957 of this Section. What is the resulting classification?
• Where should nitrification fields and repair areas not be located?
• Which of the following is a reasonable reason to pump a septic tank?
• Who operates Type 6 septic systems?
• What is the minimum size requirement for access openings in a septic tank?
• Why is it important to maintain accurate inspection and maintenance records?
• What is a leach field or drainfield's primary function?
• After installation, what should an updated drawing reflect?
• SOIL GROUP IV - Clayey Texture Soils. The clayey group includes sandy clay, silty clay, and clay textural classes and shall be considered __________________________ with respect to texture.
• The top of the partition shall terminate how far below the bottom side of the tank top in order to leave space for air or gas passage between compartments?
• What is the role of groundwater level in determining drainfield performance?
• What is the recommended approach to documenting system components during an inspection?
• How can a septic inspector determine whether soil has adequate percolation?
• A soil horizon with limited permeability typically requires what change to drainfield design?
• During a site evaluation, which factors are essential to determine the suitability of installation?
• What environmental health considerations must be observed when inspecting near wells or surface water?
• What is the minimum horizontal distance from waters classified as S.A. to the mean high-water mark?
• Which metric evaluates the drainfield soil's capacity to attenuate wastewater?
• Uniform slopes under 15 percent shall be considered what with respect to topography?
• Why is proper disposal of septic tank effluent to receiving fields important for environmental protection?
• Which soil texture group includes sandy clay, silty clay, and clay?
• What is the role of the local health department in septic system permitting?
• Which surface indicators might suggest a failing drainfield?
• What is the purpose of a pump tank in some septic designs?
• What is the main function of the drainfield trenches in a septic system?
• Which statement best describes the design implication of limited soil depth when planning a drainfield?
• Which classification applies when soil wetness is less than 36 inches below the surface?
• During an inspection, if effluent surfaces on the ground, what is the proper action?
• PLATY SOIL STRUCTURE - soils which have platy soil structure within 36 inches of the naturally occurring soil surface shall be considered ___________________________ as to structure.
• For Type 5 systems with flow greater than 10,000 GPD, what is the stated inspection frequency?
• Which statement about septic system operators is true?
• Why is noting the proximity of wells or streams on the site important during an inspection?
• How do you identify a concrete or plastic septic tank that has two compartments instead of one?
• Sites where soil wetness conditions are between 36 and 48 inches below the naturally occurring soil surface are considered what with respect to soil wetness?
• When is a soil test often required during an inspection?
• What is the minimum horizontal distance between a sanitary sewage treatment and disposal system and a public water supply source?
• Why is safe access and egress around septic system components important?
• Which soil group is associated with Sandy Clay / Silty Clay / Clay?
• What is a soil restrictive horizon, and why does it matter for drainfield design?
• Which soil group corresponds to LTAR range 0.6 - 0.3 gpd/ft2?
• How should a septic inspector assess the condition of the tank lids?
• What is the universal reporting frequency stated for all systems?
• Which document governs licensing and professional practice for NC septic inspectors?
• Prismatic soil structure within 36 inches of the naturally occurring soil surface is considered what with respect to structure?
• What are typical documentation elements for a septic system inspection report in NC?
• Which LTAR range corresponds to Soil Group IV?
• What is the difference between primary and secondary treatment in septic systems?
• What term describes the settled solids at the bottom of a septic tank?
• If groundwater is detected near the drainage area, what impact might this have on the function of the system?
• Septic tanks should have how many compartments?
• What is the minimum distance from any Class I or II reservoir to the sanitary system?
• Which statement correctly contrasts operator oversight between Type 1–3 and Type 4–6 systems?
• The effluent filter support case shall serve as a functioning sanitary tee with the bottom inlet extending down between what percent of the liquid depth?
• If signs of hydraulic overloading are observed, what should an inspector do?
• If a system underperforms and both soil limitations and equipment wear might be involved, which approach is best?
• Soils with predominantly 2:1 clay minerals (including mixed mineralogy clays) are considered what regarding clay mineralogy?
• How does soil percolation rate affect drainfield design?
• In addition to the septic tank, what other main treatment unit might be installed to handle high strength wastewater or poor soils?
• The partition in a septic tank shall be located at a point not less than two-thirds nor more than three-fourths the length of the tank from the inlet end.
• What is the purpose of setback distances in septic system siting?
• What evidence would indicate inadequate septic tank scum and sludge separation?
• What is a valid method to assess soil percolation when test results are unavailable?
• Which soil group corresponds to LTAR range 0.8 - 0.6 gpd/ft2?
• Which factors determine whether a soil test is needed for an inspection?
• How should an inspector address questions from homeowners about system life expectancy?
• What is the role of engineered soil in mound systems?
• What is the minimum horizontal distance between a sanitary sewage treatment and disposal system and a private water supply source?
• What steps should be taken if an inspection reveals an illegal alteration to a septic system?
• In inspecting a property with potential septic issues, which action is typically performed first?
• In septic design, what does design flow help determine?
• Which action best describes the purpose of routine maintenance agreements for septic systems?
• What is a lift station or pump chamber, and when might it be used?
• Which two water sources share the same minimum distance of 100 feet?
• Which condition can indicate a drainfield is not performing due to water table height?
• For Type 4 and Type 5 septic systems, which entity may operate the system?
• What elements should be included in the inspection report?
• How does a leachate plume risk assessment relate to septic systems?
• What is typically the best reason to review permit records during a septic system inspection?
• Which of the following is NOT a common sign of a failing septic system?
• What steps should be taken if you encounter an undocumented septic system installation?
• Which soil texture group includes silt and silt loam?
• How can inspectors differentiate between a properly functioning drainfield and signs of failure without excavation?
• What is the main purpose of maintaining a formal inspection checklist?
• What are two common indicators of drainfield distress that an inspector should note?
• Slopes greater than 30 percent shall be considered what as to topography?
• How do you determine if a failure is caused by soil limitations versus system component failure?
• Which component evenly distributes effluent from the septic tank to the drainfield trenches?