How Far Can a Toilet Be from a Vent Stack

According to the UPC, the distance between your trap and the vent should be no more than 6 feet. In other words, for the vent to work properly, it needs to feed into the drain line within 6 feet of the trapways that connect to it.

How far can you run a toilet waste pipe?

The toilet can be as far as 10 feet from the stack if the waste line is 4 inches in diameter. The stack can handle the new toilet if the critical distances are maintained.

How many toilets can you have on one vent?

Under the Uniform Plumbing Code, a 2″ vent can handle 24 fixture units(F.U). In a residence, a lavatory sink= 1.0 F.U., bathtub/shower= 2.0 F.U. and a toilet 1.6 gallon or less= 3.0 F.U, greater than 1.6 gallon= 4.0 F.U. So, 3-lav sinks, 3-1.6 toilets and 3-tubs/showers could be on one 2″ vent.

David Miller

David Miller

Executive Financial & Market Analyst

David Miller brings 15 years of experience in global economics, personal finance strategy, and market dynamics. He specializes in turning complex economic trends into actionable insights for everyday readers.

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