Kevin121
Member
Hello - I am looking to re-route my washing machine's drain line from the main septic drain to a separate drain/location. The question I have is regarding the vent for my toilet that is the next fixute "downstream" of the existing washing machine drain. The attached pictures probably illustrate the setup better than I can explain, however currently the washing machine has a P-trap and branch vent on an interior wall on the main floor. The drain goes through the floor into the basement and transitions to 3 inch diameter a the wye (with cleanout attached). This is where the main septic drain begins (most upsteam). The main drain runs about 2 feet or so and then picks up the toilet drain on the next wye. The main drain continues about another 4-5 feet (not visible in the picture) and then picks up the drain and another vent for the Tub/Shower unit and the bathroom sink located next to it. This vent goes up to the crawlspace and joins a horizontal section of pipe from a 2nd bathroom before going vertical and through the roof.
My question is whether I relocate the washing machine drain so that it does NOT drain into the main septic drain will that cause an issue with the venting for the toilet that is the next fixture "downstream" in the drain line, or would the toilet be using the next vent downstream in the bathroom from the sink and tub/shower? All the diagrams I have looked at online seem to show the toilet's vent either at it's drain point, or beyond it (downstream) in the main drain. I have not seen diagrams showing a vent located before the toilet in the drain system, which in my case would be the washing machine drain. The existing branch vent would remain in place for the washing machine.
Let me know any questions or clarifications needed.
Links to pictures (Could not attach them here):
https://drive.google.com/file/d/1TOSxLNPf-f03H8i2xIQzdJVfifJXCuFk/view?usp=sharing
https://drive.google.com/file/d/1Oz-bRQnxSnBuskusGtS7qZLjxC0-lT_H/view?usp=sharing
https://drive.google.com/file/d/1OnPKtXAN6i_ZPNu2zCNalTHNxKrCTKDI/view?usp=sharing
1/11 Additonal pictures:
https://photos.app.goo.gl/sevDKK7yYNucoUrF8
My question is whether I relocate the washing machine drain so that it does NOT drain into the main septic drain will that cause an issue with the venting for the toilet that is the next fixture "downstream" in the drain line, or would the toilet be using the next vent downstream in the bathroom from the sink and tub/shower? All the diagrams I have looked at online seem to show the toilet's vent either at it's drain point, or beyond it (downstream) in the main drain. I have not seen diagrams showing a vent located before the toilet in the drain system, which in my case would be the washing machine drain. The existing branch vent would remain in place for the washing machine.
Let me know any questions or clarifications needed.
Links to pictures (Could not attach them here):
https://drive.google.com/file/d/1TOSxLNPf-f03H8i2xIQzdJVfifJXCuFk/view?usp=sharing
https://drive.google.com/file/d/1Oz-bRQnxSnBuskusGtS7qZLjxC0-lT_H/view?usp=sharing
https://drive.google.com/file/d/1OnPKtXAN6i_ZPNu2zCNalTHNxKrCTKDI/view?usp=sharing
1/11 Additonal pictures:
https://photos.app.goo.gl/sevDKK7yYNucoUrF8
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