Here in Southern Indiana, specs suggest 24". As for your water line, its called a lateral. It should be lying on a bed of sand and should be covered with a layer of sand. Our municipality, when repairing mains, dig out all the dirt/soil and refill with sand around the main, and then rock.
Here is a link to the "10 state standard" that contractors should use.
http://www.leafocean.com/test/10statepreface7.html
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Had a broken water main
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