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A filter jug is one of the simplest upgrades for a UK kitchen, but it helps to know what it actually does before you buy one. Here's what to look for, and when a jug is enough.
First: is UK tap water safe?
Yes. In England, public water supplies met regulatory standards in 99.97% of tests in 2025, across more than 3.5 million samples, according to the Drinking Water Inspectorate. So a filter jug isn't about safety. Most people buy one for three everyday reasons:
- Taste and smell. Many people notice a chlorine taste, especially in tea and plain water.
- Limescale. Hard water leaves white scale in kettles and on glassware.
- Cold water on hand. A jug in the fridge makes drinking more water easier than running the tap.
Do you live in a hard water area?
Hard water is common across London, the South East, East Anglia and parts of the Midlands. One postcode analysis puts 44% of UK water districts in the hard or very hard range (TapWater.uk). You can check your own postcode on your water company's website.
If you're in a hard water area, this matters for which cartridge you choose (see point 1 below).
5 things to check before you buy
1. What the filter is certified to reduce
Look for independent certification rather than marketing words. The two you'll see most often:
- NSF/ANSI 42 covers "aesthetic" improvements: reducing chlorine taste and odour.
- NSF/ANSI 372 is a materials standard. It confirms the parts that touch your water are low-lead. It does not, on its own, show that the filter removes anything (Water Filter Guru).
Not every jug filter is designed for limescale. If that's your main reason for buying, check that the cartridge specifically says it is made for hard water.
2. How long a cartridge lasts, and what it costs over a year
The jug is a one-off purchase; the cartridges are the ongoing cost. Check the stated lifespan (in days or litres), then work out how many you'll need in a year. Many jug cartridges need changing about once a month (Hard Water Home), while some brands state longer lifespans. A cartridge that is used past its life stops doing its job, so a built-in reminder light is genuinely useful.
3. Size vs your fridge door
Measure your fridge door shelf before you buy. A larger jug means fewer refills, but only if it actually fits where you'll keep it.
4. Materials and handling
Look for BPA-free plastic or glass, a lid that's easy to fill without removing, and a handle that's comfortable when the jug is full.
5. Whether a jug is the right format at all
If you drink a lot of water, make a lot of tea, or share a kitchen, refilling a jug several times a day gets old. That's where countertop dispensers come in.
Our picks
For most homes: a filter jug
Waterdrop Chubby Water Filter Jug
Waterdrop lists this jug as NSF 42 and NSF 372 certified, with a BPA-free body, a wooden handle and a filter-life indicator light. The brand states a cartridge lasts up to 3 months or 200 gallons, which makes the yearly running cost easier to plan. It's also designed to fit most fridge doors.
Check price at Waterdrop → (#ad)
Replacement cartridges: Waterdrop Pitcher & Dispenser Replacement Filters.
If you want hot and cold water on tap: a countertop dispenser
Waterdrop CT01 Hot & Cold Countertop Dispenser
A plug-in countertop unit with no plumbing. Waterdrop lists 8-stage filtration and five one-touch presets for hot, tea, coffee, formula and cold water, with a 5L tank. Worth considering if the kettle is on all day.
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Waterdrop A1 Reverse Osmosis Hot & Cold Dispenser
The most involved option here: a reverse osmosis countertop system that Waterdrop lists with 7-stage filtration, instant hot and cold water and a display showing water readings. It takes up more counter space and costs more upfront, so it suits households that want one appliance for drinking water and hot drinks.
Check price at Waterdrop → (#ad)
Prices and offers are set by the retailer and change often, so check the current price before you buy.
Quick summary
- UK tap water is safe; a filter is about taste, limescale and convenience.
- Look for NSF/ANSI 42 for chlorine taste. NSF/ANSI 372 covers materials only.
- In a hard water area, choose a cartridge that's made for limescale.
- Budget for cartridges, not just the jug.
- Drinking lots of water or tea? A countertop dispenser may suit you better than a jug.
Photo: Sofie D. on Unsplash.