Soil and waste stack sizes.
Omaha Municipal Code § 49-906
in effectSec. 49-906. - Soil and waste stack sizes.
Soil and waste stacks shall be sized according to Table 49-906:
Table 49-906
Stack Size (inches) | Maximum Length (feet) | Maximum Fixture Units | Maximum Water Closets | Maximum Fixture Units on a Branch Interval
1¼ | 45 | 1 | 0 | 0
1½ | 60 | 3 | 0 | 0
2 | 75 | 16 | 0 | 8
2½ | 105 | 32 | 0 | 16
3 (See Note 3) | 150 | 60 | 3 | 32
4 | 225 | 240 | 24 | 72
5 | 300 | 600 | 48 | 144
6 | 400 | 1,000 | 96 | 288
8 | 600 | 3,675 | 300 | 576
10 | N/A | 5,400 | N/A | 702
12 | N/A | 8,400 | N/A | 1260
Fixture loads on branch lines are based on one-fourth inch per foot slope.
Note 1: Maximum length shall be the developed length of any soil or waste line from its originating point to the last fixture opening.
Note 2: A branch shall be any soil or waste line not vented full size.
Note 3: Maximum of three clothes washers.
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(Ord. No. 40524, § 1, 10-20-15; Ord. No. 42654, § 34, 8-13-21)
Source: City of Omaha, Municipal Code and City Charter (Municode Library, library.municode.com)URL: https://library.municode.com/ne/omaha/codes/code_of_ordinances?nodeId=OMMUCOCHGEORVOII_CH49PL_ARTIXSOWAPI_DIV1GE_S49-906SOWASTSIFetched: 10/28/2026