How Many Mobile Homes per Septic Tank?

Tiny houses and mobile homes have garnered a lot of attention in recent years. These styles of home have quickly become popular, and for a lot of people, they seem like a good way to invest your money.

Real estate has become one of the most common types of alternative investment, so you might be considering investing in mobile homes. 

But, there are a lot of things that you need to consider when it comes to mobile homes, which you probably hadn’t thought to think about. For example, the necessary plumbing that comes with these homes, and the use of septic tanks to dispose of waste. 

If you are new to this game, then there is a lot that you should know. Including the proper ways to use a septic system in line with a mobile home.

So, if you want to find out how many mobile homes you can have per septic tank, then keep on reading. 

What is a Septic Tank?

First things first, let’s take a look at exactly what a septic tank is. This is one of those things that you have most probably heard of, but might not really know what it is.

A septic tank is a type of tank that forms a major part of waste disposal in many homes in America. This includes regular homes, but, in particular, mobile homes too.

Septic tanks are stored beneath the ground, and are connected to buildings through plumbing, and they form one of the most simple types of onsite sewage disposal facilities. 

Septic tanks are not at all complex. Their design is simple, and so is their purpose. These tanks allow wastewater from homes to be routed through them in order to undergo basic treatment.

Due to the simplicity of their design, septic tanks are not suitable for complex drainage. They are also unsuitable to be used for large amounts of septic waste, simply because they lack the capacity for this.

This is why the majority of homes do not use septic tanks unless totally necessary, or unless they are in conjunction with another type of waste system. 

How Many Mobile Homes per Septic Tank?

Based on everything we have said so far about septic tanks, it is likely that you are questioning their appropriateness for mobile homes. After all, we have just said that these types of septic systems can struggle with complex drainage.

But, as a waste disposal system for mobile homes, septic tanks work very well, and that is why they are so commonly used for this type of housing. 

With that in mind, you might be wondering how many mobile homes can share a septic tank. It is important to know this if you are looking to buy a mobile home to live in yourself, or if you are looking to invest your money in mobile homes.

So, how many mobile homes can you have per septic tank?

Well, in an ideal world, every mobile home should have its own septic tank. This simply makes things easier. If every mobile home has its own septic tank, then it will be easier to find the cause when problems occur, and it will also ensure that the tank never overflows.

However, for multiple reasons, it is not always possible to give every mobile home its own septic tank. Things that could impact this possibility include price, and also space.

Septic tanks are not small, and there are rules that have to be followed in relation to their installation.

In reality, you can have up to 5 mobile homes per septic tank if they fit certain criteria. So, let’s take a look at what this criteria might be. 

Things that Impact This Figure

In some cases, you can have up to 5 mobile homes sharing a single septic tank. Even though it is best for every mobile home to have its own septic tank. It will not always be possible for 5 mobile homes to share a septic tank, this will depend on specific criteria.

So, let’s take a look at some of the things that might impact this. 

The first thing that might impact how many mobile homes can share a septic tank is size. In particular, the size of the septic tank that you are using.

Some States will have regulations that dictate this, but generally speaking, you can calculate this yourself. Your septic tank should be able to hold 2 days worth of waste for every mobile home that is connected to it. Between 75-100 gallons of waste should be allowed for every bedroom in the home.

So, you can multiply the amount of bedrooms in each home by the amount of mobile homes to calculate how many you can connect to your septic tank. 

Another thing that you need to consider is the filtration system that is used in your septic tank. Septic tanks get very dirty, and this becomes even worse when multiple mobile homes are connected to them.

So, if you want to connect multiple homes to your septic system, you have to make certain that it filters properly and that the water is softened. If this does not happen, then the number of homes that you can connect to your septic tank might be impacted. 

Finally, the number of homes you can connect to your septic tank might also be impacted by your tenants. This will only apply if you are looking to connect existing homes to a single septic tank.

In order to link multiple homes to a septic tank, you will need to get permission for your tenants, and they might not go for this.

So, if you are unable to get all of your tenants to agree to a shared septic tank, this could restrict the number of mobile homes that you can connect to it. 


In short, ideally, you should try to install an individual septic tank for every mobile home that you own. However, this will not always be possible.

So, in the right circumstances, you can actually connect up to 5 mobile homes to a single septic tank. We have looked at the criteria for this in this guide. 

Mandy Carlos
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Mandy Carlos

Hi, my name is Mandy Carlos, and I moved into my own tiny home around 5 years ago. My home is situated on my own plot of land in the country, and for the most part, I live off grid. Living in a tiny home has been incredible, and I love being away from the fast pace of city living. While tiny homes are becoming increasingly popular, there are still many people that are unaware of the best accessories, and necessities to purchase. This is why I decided to set up Clothesline Tiny Home, to share my experiences with others.

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