To answer simply, YES you can top up your pond even during a hose pipe ban. Fish are covered under the Animal Welfare Act 2006, one of the five needs stated in that law is “To be housed in a suitable environment” this covers a pond being adequately filled and the water quality at appropriate parameters and if this is not the case then a water change is needed or the pond to be topped up. This also allows a full pond clean out to be taken place whether that is by the homeowner or a professional service provider.