How do you determine if a residential property drains to the public sewer system? Do you inspect properties?

In our search report we report on the connection status of a residential property to the water and sewerage systems based on checking the current billing records held by the responsible water or sewerage company for that property. This is generally the method used to determine the connection status for Residential CON29DW searches as it is considered reasonable to assume that if a property is billed for a service then it can be considered likely to be connected for that service.