Some low-risk water discharge and groundwater activities can be exempt from requiring a permit if they meet certain conditions. Some of these 'exemptions' require the activity to be registered. This register details exempt activities which have been registered with the Environment Agency. It is worth noting that most entries in this register are for small sewage discharges which are no longer required to be registered. Consequently, most of the entries are for activities which were registered before the requirement to register them changed. There are some exempt activities which still require registration, for example groundwater tracer tests.