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logan176
Adding a bathroom to existing septic system

My neighbor has a septic system and he wants to add a new bathroom in his basement. He's been told by a friend that it's not smart to do this with a septic system because it may overwhelm the system. I know enough about plumbing to run the pipe, but I know nothing about septic systems (I have sewer!)Will he be safe adding the bathroom?

Re: Adding a bathroom to existing septic system
logan176 wrote:

My neighbor has a septic system and he wants to add a new bathroom in his basement. He's been told by a friend that it's not smart to do this with a septic system because it may overwhelm the system. I know enough about plumbing to run the pipe, but I know nothing about septic systems (I have sewer!)Will he be safe adding the bathroom?

Septic systems are designed based on the amount of fixtures will be dumping waste into the system. So I would assume it isn't smart thing to add another bathroom to the system. The system might be designed already to allow for the extra bathroom. The county usually has a record of the size of your tank on file. So I would find the size of your tank and drain field then ask a licsensed plumber if you can do it?

ed21
Re: Adding a bathroom to existing septic system

It really depends on the size of the existing septic system. Records may be available at the county if he doesn't know. While the septic is based on fixtures any modern residential system should have a minimum size tank that can handle more than is put into it. Then based on its size & usage by the number of residents, the tank needs to be pumped on a certain schedule so as not to overload the tank. This is usually in years.
Adding a fixture in a house if the number of people in the house stays the same won't really effect much. Adding a half bath so you don't have to walk as far to pee won't overload a septic system. Of course adding fixtures usually requires a permit, so the county will let you know what's required as well as upping your assessment.:rolleyes:

JLMCDANIEL
Re: Adding a bathroom to existing septic system

In my area the size of the septic tank is dependent on the number of bedrooms not the number of fixtures. Usually the more bedrooms the more people in the house. That method of sizing seems the most logical to me. If only one person lives in a house the septic system is going to receive the same amount of effluent if there is one or 50 toilets in the house.
Jack

sabo4545
Re: Adding a bathroom to existing septic system

I agree with JLMCDANIEL, it is the same thing in my area. When I bought my house a new system had to be put in. The size of my lot dictated that the system could only be big enough for a house that had 2 bedrooms so I could not add any more bedrooms. It didn't matter how many bathrooms since there would only be a couple of people using them. Your best bet of course is to always check with your local building officials. Sure we don't like to but they are there to hopefully protect your interests especially if you go and try to sell the house in the future you want everything to be on the up and up.

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