Yes, Heathrow has free water refill stations: over 100 water fountains spread across its four terminals, clearly sign-posted and mostly located near the toilets. You can fill an empty bottle for free both before and after security; the 100ml liquids rule only applies to what you bring through the security scanner already filled, not to an empty bottle you top up afterwards. Checked against Heathrow's own facilities page, 2026.
Where are the water fountains at Heathrow?
Heathrow's own terminal facilities page confirms more than 100 water fountains across Terminals 2, 3, 4 and 5, and says they're "clearly sign-posted and located at most toilets", where you're welcome to fill up a bottle. This matches Heathrow's partnership with Refill, the UK campaign working with transport hubs to cut plastic bottle use by making free tap water easy to find; Heathrow is listed as one of Refill's airport partners.
With 100+ fountains spread across four large terminals, exact locations vary by specific gate and pier, and change as terminals are refurbished, so the most reliable approach on the day is to look near any toilet, which is where most fountains sit, rather than relying on a fixed list of exact spots that could be outdated by your travel date.
Can you bring an empty bottle through Heathrow security?
Yes. An empty, reusable bottle isn't a liquid for the purposes of the security rules and goes through the scanner the same as any other item in your hand luggage. The 100ml limit applies only to liquids, gels and pastes you're carrying filled; it has no bearing on an empty container. Bringing an empty bottle and filling it airside, after security, is a straightforward way to avoid buying bottled water at terminal prices once you're through.
Before or after security: where should you fill up?
Both options work, since fountains exist on both sides, but most travellers get more value filling up after security, since that's when you're waiting at the gate or walking to your flight and water becomes something you actually want to hand. If you're arriving at the airport thirsty well before security, there's no reason not to top up early too, since the fountains before security are free to use as well.
What if you can't find a fountain nearby?
If you're struggling to locate one, ask any member of staff, who can point you to the nearest fountain, typically by the toilets in your pier or terminal area. As a fallback, most airside cafes and restaurants will fill a bottle with tap water free of charge if you ask, even if you're not buying anything, though this depends on the individual outlet rather than being a guaranteed Heathrow-wide policy.
How Heathrow compares with other UK airports
A growing number of UK airports have added free water refill points over the past decade, largely in response to campaigns like Refill and growing pressure to cut single-use plastic in retail-heavy environments like airport terminals. Heathrow's count of over 100 fountains across four terminals is a substantial rollout by the standards of any single UK airport, reflecting both its size (it's the UK's busiest airport) and its stated partnership with the Refill campaign specifically. If you're connecting through a smaller regional airport on the same trip, don't assume the same level of provision; check that airport's own facilities page rather than assuming a Heathrow-style fountain is guaranteed.
Why bring a refillable bottle at all?
Buying bottled water airside at Heathrow, like at most UK airports, costs noticeably more than the same bottle outside the airport, since airside retail generally carries a premium. A reusable bottle filled for free at one of Heathrow's fountains avoids that cost entirely, and cuts down on single-use plastic, which is the specific aim of the Refill partnership Heathrow has signed up to.
FAQs
Does Heathrow Airport have free water fountains?
Yes, over 100 across its four terminals, sign-posted and mostly located near the toilets, both before and after security.
Can I bring an empty water bottle through Heathrow security?
Yes. An empty bottle isn't a liquid for security purposes and can go through the scanner in your hand luggage. The 100ml liquids rule only applies to liquids you're carrying already filled.
Are Heathrow's water fountains free to use?
Yes, there's no charge to refill a bottle at any of Heathrow's water fountains.
Where exactly are the water fountains at each Heathrow terminal?
Mostly near the toilets in each terminal and pier. With over 100 spread across four terminals, ask any member of staff for the nearest one if you can't spot the signage.
Is Heathrow part of any tap water refill scheme?
Yes, Heathrow is a partner of Refill, the UK campaign that works with transport hubs and other venues to make free tap water easy to find and cut single-use plastic bottle waste.
Can I fill a bottle at an airside café instead of a water fountain?
Many airside cafes and restaurants will fill a bottle with tap water on request, even without a purchase, though this depends on the individual outlet rather than being a guaranteed Heathrow-wide service; the dedicated water fountains are the more reliable option.