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Find out how far the problem extends
If the cold tap stops running, check the water company's official incident information and ask nearby neighbours whether they are affected. Note whether the problem is limited to one tap, your flat, one part of the block or nearby buildings. This helps the people investigating; it does not establish the cause by itself.
Report the problem to the landlord, managing agent, housing provider or factor responsible for your building. Give the flat number, floor, time it started and any observations about other homes. If the supplier reports that the street supply has returned but your flat still has no water, tell both parties.
Do not start turning communal valves or resetting plant-room equipment. Some buildings have shared storage or pumping arrangements, while others do not. Ask the manager which system your building uses and who is authorised to inspect it.
Ask for a building-specific explanation
A useful management response answers practical questions. Which contractor is attending? Is the incoming supply affected? Are there instructions about using taps, toilets or appliances? When will residents receive the next update?
The Drinking Water Inspectorate explains that stored water quality depends on how a tank is designed, installed and maintained. A tank in the building is not permission to open a hatch and collect drinking water yourself. Report access or maintenance concerns through the responsible person.
Keep a short record of reports and reference numbers, especially when the supplier and building manager are investigating different parts of the system. Record facts such as “kitchen cold tap stopped at 08:15” rather than an assumed diagnosis. Ask each party what has been checked before accepting that the problem belongs to someone else.
Plan the last few metres of a water delivery
A collection point or a pallet in the entrance hall does not solve access for someone who cannot carry water upstairs. Tell the supplier and building manager about stairs, a broken lift, heavy fire doors or mobility problems. Ask specifically how water will reach the flat.
Use manageable loads. A litre of water weighs about a kilogram before packaging, so a six-pack of large bottles can be far too much to carry in one trip. Split loads and keep one hand free where needed for a handrail. Do not attempt a load that is unsafe for you.
If neighbours offer to help, agree the task and respect privacy. Share delivery requirements with the people arranging support rather than posting someone's health details in a residents' group. Keep halls, stairs and exits clear of bottles, trolleys and empty packaging.
Register for support before an outage
Water suppliers offer additional-support arrangements. Ask the company serving your building about eligibility and make sure it has the flat number and access details. Do not assume registration with an electricity company also registers you with the water supplier.
In Scotland, ask Scottish Water about its Priority Services Register. In Northern Ireland, use NI Water's Customer Care Register, which includes a nominated carer contact and other assistance. In England and Wales, use your water company's scheme.
Thames Water's preparation advice notes that registration takes time and an application during an outage does not mean immediate assistance. If essential needs are not being met now, contact the supplier directly as well as making the application. For water-dependent medical equipment, use the plan agreed with the clinical team.
Keep a reserve inside the flat
The UK government's starting recommendation is three litres of drinking water per person per day for three days. Two people therefore need 18 litres for that drinking-water baseline, with additional needs considered separately.
Choose bottles and a storage place you can manage. A clean, suitable space inside the flat is more useful than a communal cupboard you may not be able to unlock. Follow storage instructions and avoid overloaded shelves. See storing water at home for the practical checks.
Keep some ready-to-eat meals so the reserve does not disappear into cooking pasta and washing several pans. Prioritise safe water for drinking, food preparation and essential hygiene. Ask the building manager about toilet arrangements if the interruption continues; do not improvise work on shared drainage.
When the taps run again
Read the supplier's restoration advice and any separate instruction from the building manager. A shared system may need attention after the network supply returns. Report a continuing fault rather than repeatedly trying to operate communal equipment.
If a boil water or other restriction is in place, follow it until it is explicitly withdrawn. Running water is not the same as unrestricted water. Report unexpected discolouration, smell or other quality concerns to the supplier.
After the event, keep the useful contact and access details. Ask the manager to address any recurring problem with communication, delivery access or the building's system. Refill your household reserve through normal shopping so the next interruption begins with water already upstairs.