Main water lines do as the name implies-- provides your home with its main water supply. Many do not realize that the lines that run from the street to the home is the homeowners responsibility. Some signs that there is an issue and it is recommended that you contact a professional:
Water is discolored
Excessive amounts of water on your property
Unexplained increase in your water bill
Low or no water pressure
No water or low water pressure
The main water lines may be compromised and break due to several reasons but not limited to: deterioration due to age, tree root infiltration and weather change. If you are presented with any of these issues or your water line needs replacement, contact someone that has experience that can be trusted.