Soil and waste systems located below the building sewer or public sewer.
Omaha Municipal Code § 49-907
in effectSec. 49-907. - Soil and waste systems located below the building sewer or public sewer.
When all or part of the building drainage system cannot be drained by gravity to the building drain, building sewer, private sewer or city sewer, the following requirements shall apply:
(a) Lifting equipment and piping shall be considered part of the plumbing system.
(b) The soil and waste systems shall discharge into an airtight sump or receiving tank located to receive the sewage by gravity.
(c) Soil, waste and vent piping for fixtures discharging into the sump (or receiving tank) shall comply with gravity system requirements.
(d) The discharge piping shall be no smaller than the connection on the pump/equipment and all pipe and fittings shall be pressure rated for 1½ times the maximum head pressure rating of the pump.
(e) The waste fixture unit rating is based on the gallons per minute discharge of the pump according to Table 49-907(e) below:
Table 49-907(e)
Discharge (G P M) | Load Fixture Units | Discharge (G P M) | Load Fixture Units | Discharge (G P M) | Load Fixture Units
3.0 | 1 | 18.4 | 17 | 52.5 | 140
5.0 | 2 | 18.8 | 18 | 57.0 | 160
6.5 | 3 | 19.2 | 19 | 61.0 | 180
8.0 | 4 | 19.6 | 20 | 65.0 | 200
9.4 | 5 | 21.5 | 25 | 70.0 | 225
10.7 | 6 | 23.3 | 30 | 75.0 | 250
11.8 | 7 | 24.9 | 35 | 80.0 | 275
12.8 | 8 | 26.3 | 40 | 85.0 | 300
13.7 | 9 | 27.7 | 45 | 105.0 | 400
14.6 | 10 | 29.1 | 50 | 124.0 | 500
15.4 | 11 | 32.0 | 60 | 170.0 | 750
16.0 | 12 | 35.0 | 70 | 208.0 | 1,000
16.5 | 13 | 38.0 | 80 | 238.0 | 1,250
17.0 | 14 | 41.0 | 90 | 269.0 | 1,500
17.5 | 15 | 43.5 | 110 | 297.0 | 1,750
18.0 | 16 | 48.0 | 120 | 325.0 | 2,000
(f) All discharge piping shall be labeled "Pressure Waste Line" and no other waste shall be connected to this line.
(g) The system shall be connected to the building drain or building sewer with a full flow check valve and gate or full flow ball valve installed in the discharge line no higher than five feet above the top of the sump or tank.
(h) The airtight sump or receiving tank shall be vented accordingly:
(1) The sump shall be vented according to the manufacturer's recommendations, but no less than 1½ inches.
(2) The vent pipe size is based on the waste fixture unit and the length of the vent pipe in accordance with section 49-1313.
(3) The sump vent may be connected to the building venting system.
Exception: Soil and waste system discharged through a pneumatic ejector the vent for the sump or receiving tank shall be run independently of other vents.
(i) A sump or receiving tank is not required to be airtight or vented when a sub-drain receives discharge from a single basement floor drain only or residential clothes washers.
(j) A macerating toilet system may be permitted as an alternate to a sewage pump system when used for a single bathroom or restroom when in the opinion of the chief plumbing inspector the bathroom or restroom cannot be installed using a gravity system.
(Ord. No. 40524, § 1, 10-20-15)
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_S49-907SOWASYLOBEBUSEPUSEFetched: 10/28/2026