Sewage pump for Guest House, connect to Main House or City sewer line?

[JimFromAustin]

Hi Guys,

Building a fairly large 3 bed /2.5 bath with full kitchen and laundry guest house in back yard. Old house is in front yard, built in 1950. Guest House in backyard requires a sewer pump. Should sewer pump tie in with the old house? Or should it tie directly to city sewer and bypass old house? It is ~100 feet to main house which starts with PVC sewer line (due to an addition from 1990's). This PVC then connects to old cast iron plumbing via rubber hose. The cast iron completes the final run of the main house sewer line. If the guest house line is run directly to the city sewer, then it would be about 160 feet. Plumbers are using a Liberty Pump Pro 380 and 2" line.

 

[Jeff H Young]

Either way works , just a matter of whether you want pumped waste inside your house or basement it might be easier but inside 70 year old piping Id rather not . or tie in downstream in the nice pvc ? might concider a B/W valve on main house

 

[Sponsor]

 

[Sylvan]

Pump directly to the sewer main for several reasons

1- If you have a stoppage in the older house main and the pumps discharge your in for a nasty flood

2- If you decide to sell the property to different owners you may need a permit for "right of way" using someone else's sewer line .

3- if a stoppage does occur who is to pay the bill the older house or the one who tied in?

4- A 160 ft run should require at least 2 clean outs and I would use a sewer ejector with a minimum discharge of 3" and possibly a duplex and one should be a battery back up just in case.

If finances are a problem then go 2" inside the older home and connect after the bldg house trap