Well Fortunately. Since I Live in San Diego. All I would Do is Call the San Diego Gas and Electric's Section Called Dig Alert. And They Will Come Out and mark out For FREE the Utilities. And I believe it also applies to all of California.
But since I don't know what state your in I would just contact the Local Utilities or Maybe do a Local Search in Your Area for "Dig Alert". Just Might take Two or Three days, but none the less they will mark everything out for you. The Number is 811 well for San Diego.
There again there's the paid route to locate piping underground. You would have to do a little research to find out what the actual costs are to find piping in your yard in your area.
Which always makes sense to your research. To locate the piping in your yard. Especially if you plan on digging in your yard.
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