Rancho Water recently advised customers to be cautious of anyone impersonating a utility worker. I am not sure if this has happened locally but there have been reports of it across the country. Their advice is to not open the door if you did not schedule service and to call the District immediately at 951-296-6900 to confirm whether or not an employee was sent to your property.
Bottom line- Always use caution when answering your door to anyone that is unfamiliar to you. A uniform or nametag is not necessarily a guarantee.