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gas lines are usually buried 450 and 600mm deep. Gas to a house is most likely around 18 inches for the house line around 30 to 36 gas main and water is around 3 to 4 feet towards the north where it gets cold. I guess you know the electric and phone could be buried too.
Pipelines exist almost everywhere. Natural gas is delivered directly to homes in relatively small diameter distribution lines buried under the street and even your own yard. Larger cross-country transmission pipelines delivering gasoline, home heating oil, or moving crude oil or natural gas are actually easier to find. Nearly the entire mainline pipe is buried, but other pipeline components such as pump stations are above ground.