Water-Supply SystemsAccording to the California Plumbing Code, underground water pipes must be buried at least 12 inches, and any solder used to connect pipes must be lead-free in water systems for potable, or drinking, water. The water-supply pipe to any building must be at least 3/4 inches thick, though the code suggests using supply pipes that are 1 inch wide and wider. Hose outlets and landscape watering devices that connect to the potable water-supply system must attach through a backflow-prevention device. The code recommends using screw-on vacuum breakers. Change-Of-Direction FittingsUse 1/16 bends, 1/8 bends, 1/6 bends or other equivalent sweep for changes in drainage pipe direction, according to the California Plumbing Code. Drainage pipes that discharge into another drainage pipe must do so through a wye or combination wye connection, which is a connection fitting that allows for sewer line access usually by a sewer snake. The code excludes horizontal pipes that discharge into vertical pipes from this requirement, but discharge must be done through a sanitary tee connection.

Traps and VentingEach plumbing fixture in and around your residence must have a trap, and each trap must have a vent pipe protecting it, according to the California Plumbing Code. These traps help prevent sewer gas from leaking into your residence, while the vents prevent any water in the traps from being moved by water movement elsewhere in the drainage system. Special venting is allowed for kitchen island fixtures, where “venting a fixture in an isolated location where vent pipes installed as normally required in UPC - Universal Plumbing Codes - would not be practical,” according to the California Plumbing Code. SewersAccording to the California Plumbing Code, a residential sewer must begin two feet outside the building, connect to the public sewer and have a minimum slope of 1/4 inch per foot. The sewer must have a separate cleanout at its upper end, and there must also be a pop-up cap, or back-pressure relief cap, at the property line cleanout. The entire assembly must be made of cast iron, and pipes must be at least 4 inches wide.

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The code also sets a three-foot maximum to cleanout. To test the sewer line, plug its lower end and then fill with water to its highest point. California code also allows for a 5-psi air test.

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