Emergency Water Storage & Filtration for UK Homes and Flats: The Complete Guide

A burst main, a freeze-thaw event or a treatment-works fault can leave a UK town without tap water for days or longer. The good news is that water is the cheapest and easiest part of preparing.

How much water per person?

Plan on at least 3 litres per person per day for drinking and basic hygiene, more for children, pregnancy, hot weather or medical needs.

You do not need to store all of it. Combine stored water with the safe sources and filtration below.

Where to store water in a flat

• Sealed bottles under beds and at the bottom of wardrobes.
• Food-grade 10–20 L containers in a cupboard or hallway.
• Clean bottles filled from the tap before a forecast outage; rotate every 6 months.
• Keep stored water away from sunlight and chemicals.

Hidden safe sources in a British home

If you know a water cut is coming, fill the bath, sinks and pans (for flushing and washing). Your kitchen cold tap is usually direct from the mains and the best source while pressure lasts. A hot-water cylinder can hold a significant amount, but ask a professional or check guidance before drinking from it, as it may be unsuitable. Never drink from the central heating system or toilet cistern.

Two-stage purification

1. Filter: remove sediment through a clean cloth or a purpose-made filter.
2. Disinfect: boil at a rolling boil for at least 1 minute, or use purification tablets following the maker's instructions.