Water: Any issue that is between the water meter and the house is private (homeowner responsibility).
Sewer: Any issue that is from the main sewer line to the house is private (homeowner responsibility). The main sewer line may be across the street, down several houses, or in a different yard. This means the lateral that runs from the main service line to the house is still private (homeowner responsibility). If there is an issue with a line that is under a road or in someone else’s yard, the home owner must get an encroachment permit from the Building Department at the City of Placerville to repair the issue. (At homewoner's expense)
If you have your own gate valve before the house and after the meter feel free to shut it off on your own. If you don’t have your own gate valve, a licensed, qualified plumber may install one for you at your expense.