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Combined Storm and Sanitary Sewer

Combined Storm and Sanitary Sewer

Combined Storm and Sanitary Sewer

Does anyone know if the latest ICC International Plumbing Code indicates that combined sewers are permitted or not. It seems like most states have amendments added to the code to prohibit this kind of condition. Any tips will be greatly appreciated.

RE: Combined Storm and Sanitary Sewer

Define conbined sewers. Are you defining this as a system that receives stormwater plus nonpotable waste water? The 09 IPC recognizes cisterns as a source for nonpotable water that requires treatment.

RE: Combined Storm and Sanitary Sewer

Yes, roof stormwater and residential sanitary waste is the combination I am asking about. I believe some towns still allow the combination provided the storm water connection is 10 feet downstream from the last plumbing fixture connected, has a backflow preventer and a trap.

RE: Combined Storm and Sanitary Sewer

Looks like Scottsdale has/had some areas where the Municipal sewers are combined and carry sewage waste and service storm drains, very common in the North East US. The thinking in those municipalities is/was that a building only needed one sewer when connecting to a combined sewer because if storm water was conveyed separately its ultimate destination would be the combined sanitary sewer. In many of these areas there has been a lot of municipal money spent separating sewers, and then homeowners are being forced to install separate storm or sanitary piping at the homeowners cost. (It is almost always better to install new sanitary piping, avoids foundation drains.) Looks like Scottsdale either separated or is thinking ahead.

RE: Combined Storm and Sanitary Sewer

its illegal here because the storm water would have to go through the sewer treatment plant and that would over tax the system

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