Heads up: There are no amended sections in this chapter.
  1. Fixture Traps. All directly connected plumbing fixtures, except those having integral traps, shall be separately trapped by a water-seal trap, placed as close to the fixture outlet as possible. A kitchen sink with up to three basins may be installed on one trap if one compartment is not more than 6 inches deeper than the other and the waste outlets are not more than 30 inches apart. (See Appendix D.Illustration A.)
  2. Distance of Trap to Fixture. The developed length from the fixture outlet to the trap weir shall not exceed 24 inches, except that an interceptor used as a trap shall be located as close as possible to the fixture. The maximum developed length from the fixture outlet to the inlet of the interceptor shall not exceed 5 feet. (See Appendix D.Illustration B.) The standpipe inlet for an automatic clothes washer shall not exceed 48 inches above the weir of a trap.
  3. Trap Size. The size of trap for a fixture shall comply with Appendix A.Table E for minimum size of traps. No trap shall be larger than the fixture drain to which it is connected or the drainage pipe into which it discharges.
  4. Type of Traps. Traps shall have a uniform and smooth interior, and shall have no partitions or movable parts. The trap seal shall be non-adjustable. (See Appendix D.Illustration C.)
  5. Drum Traps. Drum traps shall be 3 or 4 inches in diameter and provided with a fixed water seal of at least 2 inches. The trap cleanout shall be one size less than the trap diameter.
  6. Trap Seal. Each trap shall have a water seal of 2 inches except where a deeper seal is required to prevent the loss of the trap seal by evaporation. Where loss of the trap seal may occur due to evaporation, one of the following shall be used:
    1. Vegetable oil may be added to the trap.
    2. A deeper seal not to exceed 8 inches may be used.
    3. An automatic trap primer may be used.
  7. Trap Cleanouts
    1. Each fixture trap, except those cast integrally or in combination with fixtures in which the trap seal is readily accessible or except when a portion of the trap is readily removable for cleaning purposes, shall have an accessible threaded or cam lock cleanout plug of ample size protected by the water seal. (Exception: See subsection (g)(4).) The cleanout plug shall be of brass or other non-corrosive type material. (See Appendix D.Illustration D.)
    2. Trap cleanouts shall be made gas and water-tight with a threaded cleanout plug and approved washer.
    3. A P-trap that is used on a bath waste shall be directly below the tub overflow. The overflow shall be fastened to the tub by means other than the face plate.
    4. A P-trap on a plumbing fixture that is not accessible may be installed without a cleanout plug or having a portion of the trap readily removable, provided that there is access to a cleanout within 3 feet of the trap.
  8. Trap Level and Protection. Traps shall be set level with respect to their water seals and, where necessary, they shall be protected from freezing.
  9. Traps Underground. Underground traps shall be provided with accessible and removable cleanouts, except for separate "P" traps into which floor drains, urinals and other fixtures with removable drain strainers discharge.
  10. Building (House) Traps. No trap shall be installed at the base of a soil or waste stack or in a building drain.
  11. Prohibited Traps. Use of the following traps is prohibited (see Appendix D.Illustration E):
    1. Traps that depend upon the action of movable parts for their seal;
    2. Full "S" traps. Exception: Water closet and similar fixtures that depend on self-siphonage for their proper operation;
    3. Bell traps;
    4. Crown vented traps;
    5. Unvented running traps; and
    6. Fixtures with concealed interior partitioned traps. Exception: Fixtures with integral traps constructed of vitrified earthenware and penal institutional fixtures with integral traps constructed of ferrous material.
  12. Double Trapping. No fixture shall be double trapped.
(Source: Amended at 38 Ill. Reg. 9940, effective April 24, 2014)
  1. Location of Cleanouts Within a Building Drain
    1. Cleanouts shall be not more than 50 feet apart, including the developed length of the cleanout pipe, in horizontal drainage lines of 4 inches or less size. Cleanouts shall be not more than 100 feet apart, including the developed length of the cleanout pipe, in horizontal drainage lines of over 4 inches to 10 inches in size. Cleanouts shall not be more than 150 feet apart, including the developed length of the cleanout pipe, in horizontal drainage lines exceeding 10 inches in size. For underground drainage lines exceeding 10 inches in size, manholes instead of cleanouts shall be provided and shall be located at intervals of not more than 150 feet.
    2. When it is necessary to conceal a cleanout plug, a readily accessible covering plate or access door shall be provided.
    3. A test tee at the base of the stack may be used as a cleanout.
    4. A full size cleanout shall be located within 5 feet of the building foundation, inside or outside, in direct line with the building drain and sewer.
    5. All cleanouts in vertical stacks shall be located no higher than 48 inches above the floor.
  2. Change of Direction. A cleanout or manhole shall be installed at each change of direction of the horizontal building drainage system greater than 60 degrees; the total of the fittings between cleanouts or manholes shall not exceed 120 degrees. A manhole within a building shall be provided with an iron cover which shall be securely bolted in place and made gas and water-tight with a soft metallic gasket.
  3. Underground Drainage. When installed on an underground drain, cleanouts shall be extended to or above the finished grade level; or may be extended to outside of the building. (See Appendix D: Illustration F.)
  4. Concealed Piping. Cleanouts on concealed piping shall be extended through and terminate flush with the finished wall or floor; or pits or chases may be left in the wall or floor, provided they are of sufficient size to permit removal of the cleanout plug and cleaning of the system. (See Appendix D: Illustration G.)
  5. Base of Stacks. A cleanout shall be provided at, or no more than 4 feet above, the base of each vertical waste or soil stack.
  6. Buildings with Slab Floors. For buildings with a slab floor or with less than a 36 inch crawl space under the floor, or where a stack cleanout is not otherwise readily accessible, one of the following shall be provided in lieu of a cleanout at the base of the stack:
    1. The building drain shall be extended to the outside of the building and terminated in an accessible cleanout.
    2. An accessible 2 way cleanout shall be installed in the building drain downstream from the stack provided that no other drainage pipe connects to such pipe inside the walls of the building unless it has its own cleanout at the base of the stack or extended outside the building.
  7. Direction of Flow. Every cleanout shall be installed so that the cleanout opens in a direction opposite to the flow of the drainage line or at right angles thereto, except as permitted in subsection (f) of this Section.
  8. Cleanout Plugs. A cleanout shall not have a plumbing fixture installed in it or be used as a floor drain.
  9. Cleanouts shall be of the same size as the pipe they serve up to a maximum of 6 inches, and at least 6 inches for larger pipe.
  10. Cleanout Clearance. All cleanouts shall have a clearance of 18 inches for the purpose of rodding. (See Appendix D: Illustration H.)
(Source: Amended at 28 Ill. Reg. 4215, effective February 18, 2004)
Fixture Trap. A fixture trap, readily removable and without disturbing concealed plumbing or requiring fixture removal, is acceptable as a cleanout equivalent, if there is no more than one (1) 90 degree bend on the line to be rodded. A water closet is not considered a cleanout equivalent.

(Source: Amended at 22 Ill. Reg. 21540, effective December 1, 1998)
Where a vitrified clay or other brittleware, acid-proof trap is installed underground, it shall be embedded in concrete to a thickness of six (6) inches from the bottom and side of the trap.
Linked Resources
P
P Premium Feature

This feature is included in the premium subscription. Visit the feature page to learn more.

Learn More
Code Compare
P
Code compare is not available for this code.
Bookmarks
P
P Premium Feature

This feature is included in the premium subscription. Visit the feature page to learn more.

Learn More
Amendment Styling
P
Amendment styling is not available for this code.