Letter: Water Reading Req is a document sent from a water utility provider to its customers requesting that they provide their current water meter reading. This type of letter is typically sent out each month to customers so that the utility provider can accurately bill them for their water usage. There are two main types of Letter: Water Reading Req: the standard form letter and the individual customer letter. The standard form letter is sent to all customers and contains a form that customers can fill out with their current water meter reading. The individual customer letter is sent to specific customers and contains detailed information about their account and the current water meter reading.