Ejector pump options for garage half bath?

[Innovate1]

Putting a half bath and additional shop sink in a new construction detached garage. Looks like I don't have quite enough elevation to drain into the sewer so I will need a pump. Run to sewer is about 120 ft and about 6" of rise. I could raise the building but the driveway to it already has a fair amount of slope and I would still have some difficulty with routing the gravity drain so that doesn't seem like a good way to go.

Currently showing a floor drain for furnace/AC condensate but those are hung so I could go with a high wall trap for condensate.

Is an integrated toilet/ejector something I should consider? The floor drain is at the very back corner so not likely to be useful for much else - eliminating it doesn't seem like a big deal although emptying things into it would be easier than into the sink.

 

[curiousB]

A diagram of existing building, existing sewer line routing (and depth), and new shop oriented on the property would help.

Now sure how an ejector pump can help on a detached building unless you want to run line above grade at which point freezing becomes a concern.

 

[Innovate1]

It's a corner sloping lot. The cross street has the sewer and it isn't very deep. The house faces that street. The garage faces the other street and the street is lower. Both streets slope down as you go from the front of the house around the corner to the garage entrance - not real steep but significant. The house will have a walkout basement toward the garage. The garage is a couple feet above the street it faces and making the approach steeper to raise the garage and allow a gravity drain doesn't seem like a wise plan.

There is no existing sewer routing on site - all new construction.

The sewer line is higher than I can use. If I ran a line from the garage to the sewer it would be almost perfectly level. But with the length of line I need about 24" of drop to get flow - per the common saying "sh** flows downhill". I need a pump to get it into the sewer line.

A bit of looking shows that there isn't much difference in cost between a sump and pump vs a combo pump/toilet so probably best to just go with the sump and pump. It takes a bit of floor space but I am thinking that can be under a counter/bench so not a huge issue.

 

[larry4406]

Will the basement of the house gravity sewer or will it need to be pumped? If basement needs to be pumped then put in a deep ejector pit, gravity flow the garage to this deep pit, then single pump up to the hung sewer.

Agree that a site plan, elevations, structure locations would help greatly.

Also I think connecting a garage floor drain to the sewer waste is verboten.

 

[Innovate1]

Will the basement of the house gravity sewer or will it need to be pumped? If basement needs to be pumped then put in a deep ejector pit, gravity flow the garage to this deep pit, then single pump up to the hung sewer.

Agree that a site plan, elevations, structure locations would help greatly.

Also I think connecting a garage floor drain to the sewer waste is verboten.

Hoping the house can gravity to the sewer. It's going to be close but yes, if needed they both can join in the basement and be pumped with one pump. How deep are the deepest standard pits and how deep can the inlet to the deep sump typically be?

Here's the site plan. Sewer is in street at the top. Garage bath is in upper left corner. Sewer exits the house in the upper right corner which is where the pump will be if it has to be in the house.


Generally speaking garage floor drains are verboten here but this is in a walled in area under a furnace and not where any vehicles can get to. It was approved.