Sewer Drain and Water Line in Same Trench

wolfgang80October 22, 2010

We are replacing our galvanized water lines with cpvc. As part of the project, we also moved the washer dryer to the garage which entailed running an ABS drain line to the main sewer line. We are using the same trench to bring the water line from the main shut-off into the house. We had planned to run the water line underground and bring it up at the back end of the garage (the garage is attached to the front of the house).

I've read the code book and in the only section I found that speaks to a sewer line and water line sharing the same trench, it does not say that you have to follow any rules so long as your water and sewer materials are approved. Because our main sewer line is so shallow, we are running the water line lower than the sewer line and it actually crosses under at two points. Is this okay to do?

Second question--Can we run the cpvc underground all through the garage or do we have to go up as soon as we enter the structure?

Thanks for your help.

Thank you for reporting this comment. Undo

Under national codes if your sewer line is solvent welded plastic (ABS or PVC) and your water line is one piece copper, solvent welded CPVC or PEX, you don't need to run them in separate trenches. They can be in the same trench.

    Bookmark   October 28, 2010 at 5:42PM
Sign Up to comment
More Discussions
Rainfresh water filter leaks from top.
I have a Rainfresh water filter. It seems to be leaking...
Water Softener - Where to start?
I am looking to purchase a water softener given our...
Hard Water or What?
We are renting an older duplex home in CT, and the...
Water Softener - calling justalurker
Hopefully you are still around. I had reached out a...
Toilet swirls, but won't flush!!
Very frustrated. The toilet seems to be ok, it gets...
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™