There are really 2 answers to this question because there are 2 kinds of locating. There are public utility lines and there are private utility lines.
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Locating Underground Water Lines
Never begin a digging project without first knowing what is buried underground. Hitting an unknown buried utility can be dangerous and expensive.
What Are the Underground Utility Color Codes?
The Uniform Color Code for underground utility marking as recommended by APWA is crucial for public safety and the protection of vital services.