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I have a project where we installed plumbing for a detatched dwelling unit connected to the sewer of the house and extending to the street. This sewer and 3 nearby homes are above the highest manhole. My inspector is asking for a backwater valve but I don't want to install one. The wording of the code indicates that any plumbing on a floor located below the upstream manhole should be protected by a BWV. Without that present, is it necessary/required? The main house has plumbing lower than the the plumbing all located on the 2nd floor of the DADU, so regardless of having the new plumbing protected, they would get soaked.
Project is located in Seattle so UPC applies.
710.1 Backflow Protection Fixtures installed on a floor level that is lower than the next upstream manhole cover of the public or private sewer shall be protected from backflow of sewage by installing an approved type of backwater valve. Fixtures on such floor level that are not below the next upstream manhole cover shall not be required to be protected by a backwater valve. Fixtures on floor levels above such elevation shall not discharge through the backwater valve. Cleanouts for drains that pass through a backwater valve shall be clearly identified with a permanent label stating "backwater valve downstream."
Project is located in Seattle so UPC applies.
710.1 Backflow Protection Fixtures installed on a floor level that is lower than the next upstream manhole cover of the public or private sewer shall be protected from backflow of sewage by installing an approved type of backwater valve. Fixtures on such floor level that are not below the next upstream manhole cover shall not be required to be protected by a backwater valve. Fixtures on floor levels above such elevation shall not discharge through the backwater valve. Cleanouts for drains that pass through a backwater valve shall be clearly identified with a permanent label stating "backwater valve downstream."