Can I install my lawn sprinkler control valve below grade?
Yes, but if you do, you will need to install an atmospheric vacuum breaker or other cross connection control device where you connect to the potable water system. UPC Section 603

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1. Do I need a plumbing permit to install a sprinkler system in my yard?
2. Do I need a gas-piping permit when I am changing from an electric water heater to gas water heater in my home?
3. Do I need a mechanical or plumbing permit to replace a furnace or water heater?
4. Can I install my lawn sprinkler control valve below grade?
5. Can I cut a hole in the supply duct of my furnace to heat my garage?
6. I am doing a small addition to my home. Can I do the framing, plumbing and mechanical myself without hiring a contractor?
7. What are the mechanical and plumbing fees for commercial permits?