Protect the sewer pathway
A suitable backwater valve can help block reverse sewer flow through the protected line.
Reduce unnecessary inflow
Downspouts, foundation drains and surface water should be handled according to local requirements so rainwater does not overload the wastewater system.
Maintain the private lateral
Camera inspection, root or defect identification and timely repair can address restrictions or damage that a valve alone cannot fix.
Plan for groundwater
Sump pumps, battery backup and waterproofing may be relevant when the flood pathway is groundwater or foundation drainage rather than sewer surcharge.
Questions
Can I install or service the valve myself?
Backwater-valve installation is regulated plumbing work and should be performed through the appropriate qualified and licensed contractor. Homeowner maintenance should follow the manufacturer instructions and local safety guidance.
How often should the valve be checked?
Follow the manufacturer instructions and local guidance. Some authorities recommend inspection every three months, while other programs recommend at least annual or pre-storm checks.
What if I cannot find the access?
Do not assume the valve is maintenance-free. A plumber or drainage contractor can help locate the device and determine whether the access has been covered or removed.