Why are there flags on my property and do the colors indicate anything in particular?

Either a neighbor, a contractor, or a landscaper has requested that all the utility lines be marked before any digging is done in your area. Yes. Each color indicates a universal color to what is buried below ground.

Red - Electric
Yellow- Gas
Orange - Telephone- TV
Blue - Water
Green - Sewer
Purple - Reclaimed Water
Pink - Survey Markings
White - Proposed Construction