Interpretation #7495
Published May 19, 2015
Original Request
- Code Version
- 2010
- Code
- PLUMBING
- Code Description
- Plumbing
- Chapter
- 7
- Section
- 715
- Topic
- Backwater valve
Question
Is it the intent of this section not to allow discharge through a backwater valve when the fixture rims are substantially above the upstream manhole? Can a utility district require one in this situation, contrary to the code?
Answer Published 05/19/2015 at 8:04 AM
Yes, it is the intent of the section as that is exactly
what it states.
what it states.
Commentary
However, the connection to a public sewer system is subject
to a contractual agreement and under the control of the
provider.
The purpose of a backwater valve is to protect fixtures
from a backup of the public sewer. Only fixtures that are
at a lower elevation than the next upstream manhole cover
are at risk. Plumbing fixtures that are not subject to
backflow are not permitted to discharge through a backwater
valve. By limiting the fixtures that discharge through a
backwater valve, you limit the amount of backup from any
upstream fixtures when the public sewer is blocked. The
valve will also be protected from excess wear and tear and
failure from debris.
That being said, the public utility has the final word.