Over time, sewer pipes age and can crack. Cracks can cause leaks and contribute to inflow and infiltration (I&I) into the sewer system. I&I occurs when storm or groundwater enters the sewer system. During significant storm events, large amounts of I&I can overwhelm the sewer system and contribute to sewer overflows. To help reduce I&I impacts to the sewer system, the District inspects all District owned sewer mains, laterals, and manholes on a regular basis and makes repairs as needed. To help reduce I&I impacts associated with private home sewer laterals, the District requires that homeowners complete and pass a sewer lateral pressure test.
What is a sewer lateral?
A sewer lateral is the pipe that conveys sewage from a building’s plumbing to the District sewer collection system. The property owner is responsible for the upper sewer lateral only – the part on private property. The District maintains responsibility for the lower sewer lateral that runs from the property line to the sewer main pipeline.
When does a sewer lateral pressure test need to be performed?
- New construction
- Remodeling of a house, building, or property served by the District’s sewer system
- Addition of plumbing fixtures or living quarters
- Change of use (i.e. residential to commercial or vice versa)
- Upon repair or replacement of the building sewer
- Prior to close of escrow unless the lateral has passed a pressure test in the last 5 years or the lateral was newly installed in the last 10 years
- Upon determination by the General Manager to protect public health, safety, and welfare
How is a sewer lateral pressure test performed?
- The tested lateral section runs from the building cleanout to the point of service or property line cleanout.
- An air pressure test is required. Air testing consists of plugging each end of the lateral and applying 4 pounds per square inch (psi) of pressure to the lateral section. The lateral must hold at least 3.5 psi for 5 minutes. If the lateral pressure falls below 3.5 psi, the test may be reattempted one time. A second loss of pressure constitutes a failure of the sewer lateral pressure test and signals that the lateral must be repaired or replaced.
- If the line fails, the owner is responsible for necessary lateral repair and/or replacement and scheduling a new test.
- The property owner is responsible for providing someone to perform the test. This can be done by a plumber, contractor, home inspection professional, or any other qualified individual that has the equipment and knowledge to perform the test.
- Sewer pressure tests are to be completed at the expense of the owner during normal business hours. The test shall be witnessed by a District inspector. Please notify the District 48 hours prior to testing at 530-583-4692.
The information above is a basic overview of the sewer lateral pressure test. Please refer to the Sewer Code and Technical Specifications or more detailed information.