How far can you move the toilet away from the vent stack in NJ?

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1

I intend to relocate the toilet bowl to another area within the bathroom, distancing it from the vent stack. What is the furthest horizontal distance I can go? Is it up to 9 feet? According to the New Jersey Plumbing Code 2018, section 12.8.4:

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2

depends on the line.

generally I keep a 12ft length as the rule but you are allowed as much as you want…

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3

So, if you want to move your toilet away from the vent, the plumbing rules usually say you can go about 6 feet without needing an extra vent. If you’re thinking of going 9 feet, that might be pushing it unless you use a wider pipe or put in another vent. It all depends on how sloped the pipe is and how big it is, so it’s a good idea to ask your local plumbing expert before you start.

4

According to the 2018 New Jersey Plumbing Code, Section 12.8, the maximum horizontal distance a toilet (water closet) can be from the vent stack is 6 feet, measured from the trap to the vent.

So no, you cannot go up to 9 feet — 6 feet is the limit unless you install additional venting.

5

The New Jersey Plumbing Code 2018, section 12.8.4, likely refers to the National Standard Plumbing Code (NSPC) adopted by New Jersey. According to general plumbing guidelines, the maximum horizontal distance between a toilet and vent stack varies based on pipe diameter
Pipe Diameter and Distance
3 inch pipe: maximum distance is typically 6 feet
4 inch pipe: maximum distance is typically 10 feet

To confirm the exact requirements for your project, consult the New Jersey Plumbing Code 2018 or contact a licensed plumber familiar with local regulations.

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