Illinois Administrative Code
Title 77 - PUBLIC HEALTH
Part 890 - ILLINOIS PLUMBING CODE
Subpart M - INSPECTIONS, TESTS, MAINTENANCE AND ADMINISTRATION
Appendix A - Plumbing Materials, Equipment, Use Restrictions and Applicable Standards
Table G - Building Drains

Universal Citation: 77 IL Admin Code § G
Current through Register Vol. 49, No. 13, March 28, 2025

Diameter of Pipe (inches)

Maximum Number of Drainage Fixture Units (D.F.U.) That May be Connected to Any Portion of the Building Drain

Grade per Foot

1/16 Inch

1/8 Inch

1/4 Inch

1/2 Inch

4

-

180

216

250

5

-

390

480

575

6

-

700

840

1,000

8

1,400

1,600

1,920

2,300

10

2,500

2,900

3,500

4,200

12

3,900

4,600

5,600

6,700

15

7,000

8,300

10,000

12,000

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