A country or city guide describes the usual situation. A water notice tells you what to do about a particular supply now. Follow the notice for your accommodation even if a general guide rates the area's tap water as safe.
Find the notice for your actual water supply
Ask your host which utility supplies the property and whether it uses a private supply. Open the issuer's notice and match the affected area to the accommodation address. The Drinking Water Inspectorate explains that water companies notify affected customers when problems occur; for private supplies, notices come from the local authority. Its guidance is for the UK, so identify the equivalent local authority when travelling elsewhere. Read the DWI guidance.
Keep the original notice link so you can check beyond a screenshot or someone else's summary. Check its issue and update information when available. Authorities use different alert systems; these checks help you find and follow the right notice.
Read the advisory's restrictions
CDC distinguishes three advisory types:
- Boil water: treatment is directed at germs; follow the notice's boiling instructions.
- Do not drink: use the specified alternative supply. Boiling does not make water containing harmful chemicals or toxins safe.
- Do not use: avoid tap-water use altogether while the instruction applies; contact itself may be dangerous.
Names can differ between countries. Read the restrictions in full and follow the local issuer's instructions. CDC's advisory overview explains these distinctions.
Check the uses you might overlook
A boil-water notice can affect brushing teeth, making ice and washing food that will be eaten uncooked. Uisce Éireann's Irish guidance calls for boiled, cooled water for these uses and says to discard existing ice. It also warns that a household filter does not guarantee safety. A filter jug in a rental kitchen is therefore not a reason to disregard the notice. See Uisce Éireann's practical guidance.
Do not assume a refrigerator dispenser solves the problem: CDC advises against using water or ice from appliances connected to the supply during an advisory. Use the alternative water specified by the notice. Check the appliance advice.
Confirm what applies before resuming normal use
Ask the issuer whether the notice still applies to your address and whether there are instructions for returning to normal use. In Ireland, Uisce Éireann links to local updates from its boil-water notice page. Use the appropriate provider's current information at your destination.
This guide explains how to read a notice. It does not report an active incident in any city or certify an individual tap. Follow the issuer's instructions for your supply.