It is illegal to connect stormwater to the wastewater system as it increases the volume delivered for treatment and can overload our wastewater treatment plants.
Further, the yard sink for your home (often located on the outside wall of the kitchen or laundry) is designed in the unlikely event of a sewer surcharge, to ensure the overflow occurs outside your home and not via your toilets and wash basins. Yard sinks are connected to the sewerage system and are not designed to collect any stormwater. It is illegal to connect or direct stormwater to your yard sink.
Hunter Water conducts inspections and smoke testing to detect illegal stormwater connections and will require you to remove any illegal work. This may mean carrying out changes to expensive landscaping - therefore it’s much better to get it right the first time.