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ILLINOIS PRIVATE SEWAGE CONTRACTOR EXAM QUESTIONS AND ANSWERS 2026 - 2027
Typology: Exams
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A single compartment tank needs to have a gas deflection baffle provided the outlet of the baffle. - ANSWERS-Below Access Manhole Requirements - ANSWERS-Above the Inlet of the Tank Above the Outlet of the Tank 12" in Diameter Less than 12" from surface Maximum Capacity of Single Compartment Tank - ANSWERS- 1350 Gallons Per Day
The volume of septic below the liquid level for flows less than 500 Gallons = - ANSWERS-750 Gallons The volume of septic below the liquid level for flows greater than 500 Gallons =
Sand Filter Water Stabilization Pond 8 or 10 inch Gravelless Seepage System Chamber System Peat Filter System Private Sewage Disposal System - ANSWERS-Any sewage handling or treatment facility receiving domestic sewage from less than 15 people or population equivalent (less than 1, gallons} and having a ground surface discharge or any sewage handling or treatment facility receiving domestic sewage and having no ground surface discharge Domestic Sewage - ANSWERS-Waste water derived principally from dwellings, business, or office buildings, institutions, food service establishments, and similar facilities Clear Water Permitted to Drain in Septic System - ANSWERS-Cooling water Groundwater Discharge from roof drains Discharge from footing tile Condensate waste from refrigeration system
Condensate from steam heating system Backwash from Water Softener Prohibited Materials for Septic System - ANSWERS-Automotive Grease Oil Solvents Chemicals Privies, Chemical Toilets, Recirc Toilets, Incinerator Toilets, Compost Toilets Holding Tanks Illinois Raised Filter Bed Preceded By Batch Aeration System If site conditions make it impractical to comply with the codes and regulations, what type of permit shall be required? - ANSWERS-Variance Permit When installing a new or innovative type of sewage disposal system, what type of permit shall be required? - ANSWERS-Experimental Permit A solids retention tank is required before a septic tank if: - ANSWERS-A garbage grinder is used
Maximum distance from the inlet wall to the inlet baffle - ANSWERS-12" Maximum distance from the outlet wall to the outlet baffle - ANSWERS-6" Distance from the top of the baffle to the bottom of the lid - ANSWERS-1" - 3" Slip in baffles shall extend: - ANSWERS-The full width of the tank Semi-Circular Baffles (V) shall have sides that fit tightly against: - ANSWERS-The tank wall The vent for the baffle shall be equal in size to: - ANSWERS-The building sewer Minimum Inlet Baffle Size Diameter - ANSWERS-6" Minimum Outlet Baffle Size Diameter - ANSWERS-4" When multiple tanks or compartments are used the first compartment shall be between and ________ of the total capacity. - ANSWERS-Between 1/ and 2/3 of the Total Capacity The wall separating the two compartments needs to be: - ANSWERS-Tight fitting
Extend to within 3" of the tank lid Have a vent equal to the size of the building drain The opening between compartments shall be: - ANSWERS-Centered on the Inlet and Outlet Openings The depth to the invert of the opening between compartments shall be percent of the liquid depth. - ANSWERS-40% A gas deflection baffle shall be provided: - ANSWERS-Below the Outlet Baffle Tanks are to be set level to +/- inches in any direction and backfilled to prevent floating or drifting. - ANSWERS-1/2" There are to be no connections within the area of. - ANSWERS-The over dig around the tank If access openings are at or below the season high water table, they shall be
. - ANSWERS-Water-Tight Abandoned Treatment Units shall be: - ANSWERS-Crumbled and filled with sand or soil
50 Feet Apart Each soil boring shall extend at least inches below the surface. - ANSWERS-At least 60" Below the Surface One of the soil borings shall be located: - ANSWERS-At the lowest elevation of the subsurface seepage system Domestic sewage or effluent from a private sewage disposal system cannot be discharged into a: - ANSWERS-Well Cistern Basement Underground Mine Cave Sinkhole Tunnel The bottom of a subsurface field, each trench, and its distribution levels are to be: - ANSWERS-Level to +/- 1 inch The amount of earth backfill over the bedding material, gravelless pipe or chamber system is between and inches. - ANSWERS-6" to 24"
There must be a minimum of feet of undisturbed soil between the septic tank and the nearest trench. - ANSWERS-5 Feet The top of the gravel, gravelless pipe or chamber system shall be inches below the invert of the outlet of the septic tank or distribution box - ANSWERS- 1" Below the Invert of the Outlet There should be a vertical separation distance of feet between the bottom of the system and the top of the limiting layer. - ANSWERS-2 Feet (3 Feet for Soils in Group I-VI) Soil classification for determining the size of the system is based on which soil profile? - ANSWERS-The least permeable soil Distribution lines need to be constructed of approved material and be perforated or open joint tile with joints place to inches apart. - ANSWERS-1/2" to 3/4" apart Perforated tile needs have a minimum of 2 rows that are 1/2" to 3/4" openings spaced to inches on center and placed downards. - ANSWERS-3" to 5" Bedding material needs to be clean gravel or stone with a particle size of to inches. - ANSWERS-3/4" to 4"
The sand filter needs to be dosed times per day with equal flows which cannot exceed the design capacity. - ANSWERS-4 times A buried sand filter needs to be designed for a minimum of gallons/day. - ANSWERS-100 gallons per day The sand filter media needs to be a minimum of inches thick, and clear of clay and silt. - ANSWERS-24" Collection lines need to have a slope of inches per 100 feet with a collection line every feet with caps on the top of the collection line. - ANSWERS-6" per 100 feet 10' Illinois Raised Filter Beds are constructed using: - ANSWERS-Batch Aeration System and a Filter Bed The aeration tank volume for a residential system is to be times greater than the average daily wastewater flow in residential applications and times greater in commercial applications. - ANSWERS-2x Residential 3x Commercial The filter loading rate for residential systems is: - ANSWERS- 4 Gallons per Square Foot per Day
Filter beds cannot exceed square feet. - ANSWERS- 600 Square Feet Aerobic Treatment Plants need to be followed by which type of system? - ANSWERS-Subsurface Seepage System Sand Filter Waste Stabilization Pond The depth of waste stabilization pond shall be between and feet. - ANSWERS-3' and 5' A waste stabilization pond following a septic tank must allow for volume times the average daily flow. - ANSWERS-60x The bottom of a waste stabilization pond shall be constructed with what grade?
Individual Mobile Home Sewage Flow Rate - ANSWERS- 200 Gallons Per Day Per Bedroom Campground Sewage Flow Rate - ANSWERS- 150 Gallons Per Day Per Site Commercial Sewage Flow Rate - ANSWERS- 400 Gallons Per Day Per Toilet Minimum Volume of Septic Tank in Residential Application - ANSWERS- 2 Bedrooms = 750 Gallons 3 Bedrooms = 1000 Gallons 4 Bedrooms = 1250 Gallons 5 Bedrooms = 1500 Gallons 6 Bedrooms = 1750 Gallons 7 Bedrooms = 2000 Gallons Gravelless System Construction Requirements - ANSWERS-Max Trench Length = 100 Feet Minimum Trench Width = 18" Maximum Trench Width = 24" Minimum Trench Depth = 18" Maximum Trench Depth = 24" Trench Slope = Level
