North Carolina Septic Inspector Exam 2 Practice Test

These questions are part of the practice quiz. Start practicing

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