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Illinois Private Sewage Contractor Exam Questions and Answers, Exams of Construction

Liberty University (LU)Construction

A series of questions and correct answers related to private sewage disposal systems in illinois. It covers topics such as domestic sewage, clear water, prohibited materials, sewer installation, approved pipe materials, septic tank regulations, and requirements for various components like baffles, access manholes, and distribution boxes. The material is useful for contractors preparing for certification exams or for anyone seeking a better understanding of sewage disposal system regulations and best practices. It also includes information on soil investigations and system design based on soil absorption capacity. A valuable resource for understanding the technical and regulatory aspects of private sewage disposal systems.

Typology: Exams

2025/2026

Available from 10/22/2025

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Illinois /
/Private /
/Sewage /
/Contractor /
/Exam //Questions //With //Correct //Answers
Private /
/Sewage /
/Disposal /
/System //- /
/CORRECT /
/ANSWERS(S)✔✔Any /
/sewage //handling //or //treatment //facility //receiving //domestic
sewage /
/from //less //than //15 //people //or //population //equivalent //(less //than //1,500
//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 //- /
/CORRECT /
/ANSWERS(S)✔✔Waste /
/water /
/derived /
/principally /
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Download Illinois Private Sewage Contractor Exam Questions and Answers and more Exams Construction in PDF only on Docsity!

Illinois /

/Private /

/Sewage /

/Contractor /

/Exam //Questions //With //Correct //Answers

Private /

/Sewage /

/Disposal /

/System //- /

/CORRECT /

/ANSWERS(S)✔✔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 //- /

/CORRECT /

/ANSWERS(S)✔✔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 //- //CORRECT //ANSWERS(S)✔✔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 //- //CORRECT //ANSWERS(S)✔✔Automotive //Grease

Oil

Solvents

Chemicals

The /

/use /

/of //

a /

/private //sewage //disposal //system //to //service //more //than //one //property

//is: //- /

/the /

/sewer /

/line /

/must /

/be /

/at /

/least /

/__________ /

/inches /

/below //the //invert //of //the //water //line. //- //CORRECT //ANSWERS(S)✔✔18"

Approved /

/Pipe /

/Materials //- /

/CORRECT /

/ANSWERS(S)✔✔Ductile /

/Iron, //Vitrified //Clay, //or //Plastic //at //least //4" //in //diameter

Raw /

/or /

/improperly /

/treated /

/domestic /

/sewage /

/cannot //be //discharged //into: //- //CORRECT //ANSWERS(S)✔✔Farm //tiles

Streams

Rivers

Ponds

Lakes

Other //collectors //of //water.

Septic /

/Tanks /

/cannot /

/be /

/located: //- /

/CORRECT //ANSWERS(S)✔✔Where //surface //water //will //accumulate

or //near:

Driveways

Accessory //building

Swimming //pools

Parking //areas

Buried //lawn //sprinklers

Underground //utilities

Patios

Slabs

Basically //Any //Structure

Approved /

/Private /

/Sewage /

/Disposal /

/Systems //- /

/CORRECT /

/ANSWERS(S)✔✔Septic/Imhoff/Aerobic /

/Treatment //Plant //Tanks //followed //by:

Subsurface //Seepage //Field

Seepage //Bed

Sand //Filter

Water //Stabilization //Pond

8 //or // 10 //inch //Gravelless //Seepage //System

Chamber //System

Peat //Filter //System

a /

/septic /

/tank //if: //- //CORRECT //ANSWERS(S)✔✔A //garbage //grinder //is //used

The /

/minimum /

/liquid //depth //of //septic //tank //is: //- //CORRECT //ANSWERS(S)✔✔42"

The /

/maximum /

/liquid //depth //of //a //septic //tank //is: //- //CORRECT //ANSWERS(S)✔✔72"

Inlet //& //Outlet //Openings //Shall //Be: //- //CORRECT //ANSWERS(S)✔✔Cast-

In

Watertight

The /

/invert /

/of //the //inlet //needs //to //be //at //least //how //many //inches //above //the //liquid

//level? //- //CORRECT //ANSWERS(S)✔✔2"

How /

/is /

/the /

/liquid /

/level /

/of /

/the /

/tank /

/determined? //- /

/CORRECT //ANSWERS(S)✔✔Equal //to //the //Invert //of //the //Outlet

The /

/inlet /

/baffle /

/extends /

/______ /

/inches /

/below /

/the /

/liquid //level. //- //CORRECT //ANSWERS(S)✔✔6" //Below //the //Liquid //Level

The /

/outlet /

/baffle /

/needs /

/to /

/extend /

/to //

a /

/depth /

/equal /

/to /

/what //percent //of //the //liquid //depth? //- //CORRECT //ANSWERS(S)✔✔40%

An /

/outlet /

/baffle /

/for //

a /

/tank /

/with //

a /

/liquid /

/depth /

/of /

/need /

/to /

/extend /

/sides /

/that //fit //tightly //against: //- //CORRECT //ANSWERS(S)✔✔The //tank //wall

The /

/vent /

/for /

/the /

/baffle /

/shall /

/be //equal //in //size //to: //- //CORRECT //ANSWERS(S)✔✔The //building //sewer

Minimum //Inlet //Baffle //Size //Diameter //- //CORRECT //ANSWERS(S)✔✔6"

Minimum //Outlet //Baffle //Size //Diameter //- //CORRECT //ANSWERS(S)✔✔4"

A /

/single /

/compartment /

/tank /

/needs /

/to /

/have //

a /

/gas /

/deflection /

/baffle /

/provided /

/__________ //the //outlet //of //the //baffle. //- //CORRECT //ANSWERS(S)✔✔Below

Access /

/Manhole /

/Requirements //- /

/CORRECT //ANSWERS(S)✔✔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 //- //CORRECT //ANSWERS(S)✔✔ 1350 //Gallons //Per //Day

The /

/volume /

/of /

/septic /

/below /

/the /

/liquid /

/level /

/for /

/flows /

/less //than // 500 //Gallons //= //- //CORRECT //ANSWERS(S)✔✔ 750 //Gallons

The /

/volume /

/of /

/septic //below //the //liquid //level //for //flows //greater //than // 500 //Gallons //= //-

//CORRECT //ANSWERS(S)✔✔Daily //Flow //X //1.

1000 //Gallons //per //day //= //1,500 //Gallons

When /

/multiple /

/tanks /

/or /

/to /

/the /

/invert /

/of /

/the /

/opening /

/between /

/compartments /

/shall /

/be /

/__________ /

/percent //of //the //liquid //depth. //- //CORRECT //ANSWERS(S)✔✔40%

A /

/gas /

/deflection /

/baffle /

/shall /

/be //provided: //- //CORRECT //ANSWERS(S)✔✔Below //the //Outlet //Baffle

Tanks /

/are /

/to /

/be /

/set /

/level /

/to /

/______ /

/inches /

/in /

/any /

/direction /

/and /

/backfilled /

/to //prevent //floating //or //drifting. //- //CORRECT //ANSWERS(S)✔✔1/2"

There /

/are /

/to /

/be /

/no /

/connections /

/within /

/the /

/area /

/of /

/__________. //- //CORRECT //ANSWERS(S)✔✔The //over //dig //around //the //tank

If /

/access /

/openings /

/are /

/at /

/or /

/below /

/the /

/season /

/high /

/water /

/table, //they //shall //be //_____________. //- //CORRECT //ANSWERS(S)✔✔Water-

Tight

Abandoned /

/Treatment /

/Units /

/shall /

/be: //- /

/CORRECT //ANSWERS(S)✔✔Crumbled //and //filled //with //sand //or //soil

Septic /

/tanks /

/that /

/are /

/designed /

/based /

/on: //- //CORRECT //ANSWERS(S)✔✔The //absorption //capacity //of //the //soil

Who /

/is /

/qualified /

/to /

/conduct //

a //soil //investigation? //- //CORRECT //ANSWERS(S)✔✔Soil //Classifier

Licensed //Professional //Engineer

Local /

/Health /

/Department //Employee //(3 //Years //Approving //Systems //with // 6 //Hours //of

//Soils //Coursework)

Local //Health //Department //Employee //(5 //Years //Direct //Supervision)

A /

/minimum /

/of /

/______ /

/soil /

/borings /

/at /

/least /

/______ /

/feet /

/apart /

/are /

/to /

/be /

/located /

/within /

/the /

/area /

/of /

/the /

/proposed /

/subsurface /

/seepage //system. //- //CORRECT //ANSWERS(S)✔✔ 3 //Soil //Borings

50 //Feet //Apart

Each /

/soil /

/boring /

/shall /

/extend /

/at /

/least /

/________ /

/inches /

/below /

/the /

/surface. //- //CORRECT //ANSWERS(S)✔✔At //least //60" //Below //the //Surface

One /

/of /

/the /

/soil /

/borings /

/shall /

/be /

/located: //- /

/CORRECT /

/ANSWERS(S)✔✔At /

/the //lowest //elevation //of //the //subsurface //seepage //system

Domestic /

/sewage /

/or /

/effluent /

/from //

/gravelless /

/pipe /

/or /

/chamber /

/system /

/is /

/between /

/______ //and //______ //inches. //- //CORRECT //ANSWERS(S)✔✔6" //to //24"

There /

/must /

/be //

a /

/minimum /

/of /

/_______ /

/feet /

/of /

/undisturbed //soil //between //the //septic //tank //and //the //nearest //trench. //-

//CORRECT //ANSWERS(S)✔✔ 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 //- //CORRECT //ANSWERS(S)✔✔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. //- //CORRECT //ANSWERS(S)✔✔ 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? //- //CORRECT //ANSWERS(S)✔✔The //least //permeable //soil

Distribution /

/lines /