foul drain

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soil pipe, soil line

A pipe which conveys the discharge of water closets or fixtures having similar functions, with or without the discharges from other fixtures. Also see cast-iron soil pipe.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
But the blue-coloured chemical, which would have been an irritant to anyone who touched it, had been poured down a storm drain instead of a foul drain.
When we have heavy rain, the water gets into the foul drains, resulting in raw sewage spilling onto the road."
Doesn't look like sewerage water so it's not her foul drains.