D.C. Mun. Regs. tit. 12, r. 12-F712
Strike Section 712.3.5 of the International Plumbing Code in its entirety and insert a new Section 712.3.5 into the Plumbing Code in its place to read as follows:
Pump connection to the drainage system. Pumps connected to the drainage system shall connect to a building sewer, building drain, soil stack, waste stack or horizontal branch drain. The discharge point shall not be upstream of any backwater valve and shall not generate a condition that could cause flooding at any of the building fixtures. Where the discharge line connects into horizontal drainage piping, the connection shall be made through a wye fitting into the top of the drainage piping and such wye fitting shall be located not less than 10 pipe diameters from the base of any soil stack, waste stack or fixture drain.
D.C. Mun. Regs. tit. 12, r. 12-F712