Wastewater outside a gully or chamber needs a simple first response. Keep children, pets and other people away, then stop using any toilet, sink, bath or appliance that makes the level rise. Do not reach into the chamber or struggle with a heavy cover.
For the next few minutes, stop more water going in
A full gully or chamber can spill again as soon as an appliance empties or a toilet is flushed. Leave the connected fixtures alone. Testing the drain with more water only adds to the overflow.
Keep the area clear
Use a safe route around the wastewater and keep it away from entrances where practical. If water has reached sockets or electrical equipment, stay out of that area and arrange electrical help first.
Do not add chemical unblocker. Product left in standing water creates another hazard for the person who opens or clears the pipe. If cleaner has already been used, keep the name of it for the call.
Tell the call handler what is happening now
The immediate facts are simple: where the water is escaping, whether the level is stable or rising, and which normal activity started it. A rainfall-only overflow may involve a different connection from foul water that rises when a toilet is flushed.
Leave covers and diagnosis to the visit
You do not need to know where the underground pipe runs. The drainage company can compare safe access points and water levels when it arrives.
Until then, keep inflow down and avoid contact. Photographs are optional and should be taken only from a safe position.
After the backed-up level is controlled
The drainage company can clear the affected route and reintroduce water gradually while watching the receiving drain. Ask which outlets were tested before returning them to normal use.
The advice here covers the immediate response. The outside drain overflow service explains clearance and handover, while the blocked-drain checklist provides a short version of the safety steps.
Do not investigate a repeat fault during an active spill
Earlier footage or service notes can be discussed once the overflow is contained. The immediate priority is to reduce incoming water and keep people out of the contaminated area.