What the stated water-resistance time actually means
Duration: Read the stated water-resistance time as the tested immersion duration, not the length of a day outside.
Posture: Test participants are immersed under prescribed laboratory conditions. It is not a test of an individual swimmer’s stroke, a sailor’s movement, or a child playing at the water’s edge.
Reflective surface: Water can add reflected ultraviolet exposure, but reflection is not measured by a water-resistance claim.
Immersion: This is the part the claim addresses. The exact protocol and claim language vary between regulatory systems.
Sweat load: Water-immersion testing is not a quantified all-day sweat test.
Cover: Clothing, straps, wetsuits, lifejackets and towels can disturb the applied film. They are outside the claim.
Reapplication window: Reapply after the stated water-resistance interval, after towel drying, and whenever the coating may have been removed. The separate field note, Reapplication, sets out a practical approach.
What fails first: The sunscreen film can be removed or redistributed by drying, rubbing and contact before a planned day is over.
This reference is for reading a pack bought abroad, rather than choosing between products. It compares the principal UK and EU cosmetics framework, the United States Food and Drug Administration system, and AS/NZS 2604, the Australian and New Zealand sunscreen standard. None permits a sunscreen to be described as waterproof. A water-resistance result concerns an SPF measurement after a specified water procedure. It does not turn sun protection into a guarantee of continuous protection.
The figures below are deliberately confined to values stated in the relevant recommendation, regulation or standard. Where a public regulator’s summary does not publish a requested numerical detail, the cell says so. That is more useful than treating similar-looking labels as interchangeable.
Cross-standard table: permitted water claims and test meaning
| Jurisdiction or standard | Permitted front-of-pack water wording | Immersion test and duration | SPF retained to pass | UVA or broad-spectrum status | What the result does not certify |
|---|---|---|---|---|---|
| UK and European Union cosmetics framework | “Water resistant” after two 20-minute immersions, or “very water resistant” after four 20-minute immersions. Source: European Commission Recommendation 2006/647/EC. | Two or four periods of 20 minutes in water, according to the claim. Source: European Commission Recommendation 2006/647/EC. | At least 50% of the pre-immersion sun-protection factor must remain after the relevant procedure. Source: European Commission Recommendation 2006/647/EC. | Separate UVA recommendation: UVA protection factor of at least one third of labelled SPF and critical wavelength of 370 nm. The UVA logo is addressed by European Commission Recommendation 2006/647/EC, not created by the water test. | No certification of towel drying, sand abrasion, garment or wetsuit friction, a particular swimming style, or a stated number of hours of sweat. Source: the scope of European Commission Recommendation 2006/647/EC. |
| United States Food and Drug Administration | “Water Resistant (40 minutes)” or “Water Resistant (80 minutes)”. “Waterproof” and “sweatproof” are not permitted. Source: United States Food and Drug Administration, 21 CFR 201.327. | 40 minutes uses two 20-minute immersion periods. 80 minutes uses four 20-minute immersion periods. Source: United States Food and Drug Administration, 21 CFR 201.327. | The post-immersion SPF test result must be at least the labelled SPF value. Source: United States Food and Drug Administration, 21 CFR 201.327. | “Broad Spectrum” is a separate critical-wavelength test of at least 370 nm. It is not established by the water-resistance test. Source: United States Food and Drug Administration, 21 CFR 201.327. | No certification of towel drying, rubbing from equipment or clothing, sand, or protection for a number of hours of sweating. Source: the defined water-resistance test in 21 CFR 201.327. |
| AS/NZS 2604, Australia and New Zealand sunscreen standard | Water-resistance claims identify the tested duration: 40, 80, 120 or 240 minutes. Source: AS/NZS 2604:2012 and the Australian Therapeutic Goods Administration sunscreen guidance. | The standard uses repeated 20-minute water-immersion periods, with duration corresponding to the claim. Source: AS/NZS 2604:2012. | At least 50% of the labelled SPF must remain following the applicable water-resistance procedure. Source: AS/NZS 2604:2012. | Broad-spectrum status is separately assessed under the standard’s UVA requirements. The water-resistance procedure does not itself demonstrate UVA protection. Source: AS/NZS 2604:2012. | No certification of towel drying, sand abrasion, rubbing by a wetsuit or other clothing, or a defined number of hours of sweat. Source: the water-resistance scope in AS/NZS 2604:2012. |
The table compares what the claims mean, not the legal status of every sunscreen in every shop. In particular, Australia regulates therapeutic sunscreens through the Therapeutic Goods Administration, while New Zealand’s wider legal framework is different even where a label refers to the joint standard.
How to read a UK or EU water-resistance claim
In the UK and EU framework, “water resistant” and “very water resistant” are distinct claims. The useful number is not printed as 40 or 80 minutes in the claim itself, but follows from the prescribed test: two 20-minute immersions for water resistant, four for very water resistant. The European Commission’s 2006 sunscreen recommendation says that, after the relevant procedure, the product should retain at least 50% of the protection measured before immersion.
That threshold needs careful reading. It does not mean that a wearer receives half of the factor printed on the pack after every 40 or 80 minutes at a beach. It describes a test comparison before and after a controlled procedure. Applied quantity, water movement, drying, physical contact and uneven coverage all matter outside that procedure. A label also cannot convert a one-off laboratory result into permission to wait all afternoon before applying again.
UVA information should be read separately. The European Commission recommendation sets the familiar relationship between UVA protection and labelled SPF, alongside the critical-wavelength criterion. Its UVA logo guidance concerns broad ultraviolet protection, whereas water resistance concerns retention after immersion. A product can therefore present both kinds of information, but they answer different questions.
For a fuller explanation of the underlying claim, see this publication’s standards note What water resistant certifies. For the measurement of SPF before or after a water procedure, see How SPF is tested. The separate note The UVA circle explains the European UVA mark rather than treating it as a water symbol.
How to read a United States water-resistance claim
United States labels make the duration more visible. The Food and Drug Administration requires the wording “Water Resistant” followed by either “40 minutes” or “80 minutes”. The label language follows the defined test: two 20-minute immersion periods for 40 minutes and four for 80 minutes. The FDA rules do not allow “waterproof” or “sweatproof” claims for sunscreen.
There is an important difference from the UK and EU reference point. Under the FDA rule, the SPF result after the relevant water-resistance procedure must be at least the SPF shown on the label. This makes the US test threshold different from the European Commission recommendation’s 50% retention criterion. It does not, however, make the US wording a guarantee against every way sunscreen can be removed in use.
“Broad Spectrum” is another separate piece of label information. In the FDA system it depends on a critical-wavelength test, not the water test. A pack carrying both “Broad Spectrum” and “Water Resistant (80 minutes)” is communicating two results under two methods: ultraviolet spectral coverage and performance after the specified immersion procedure. Neither phrase is a statement that the applied film will withstand a towel, a shoulder strap, sand, or persistent rubbing.
For the wider regulatory context, consult this publication’s Sunscreen in the United States. When comparing a US pack with one bought elsewhere, match the words and the stated test duration first. Do not assume that an identical SPF number says anything about water retention on its own.
How to read an Australian or New Zealand standard claim
AS/NZS 2604:2012 gives a broader set of water-resistance durations: 40, 80, 120 and 240 minutes. A claim based on this standard should identify the tested duration. The Australian Therapeutic Goods Administration refers to this standard in its guidance for therapeutic sunscreens. As with the other systems, the duration is attached to a controlled water procedure, not to all the conditions in a holiday, race or working day.
The standard’s water-resistance procedure uses repeated 20-minute immersions. Its threshold is at least 50% of labelled SPF remaining after the applicable procedure. Thus, a 240-minute claim is not simply an enlarged version of a 40-minute label from another system. It rests on more immersion cycles and sits within a different standard. Comparing only the large number on the front of the pack can hide that distinction.
Broad-spectrum protection is assessed separately under the standard’s UVA requirements. It should not be inferred from the word “water resistant”, whatever the stated duration. Equally, a broad-spectrum claim should not be read as proof that sunscreen will stay in place under repeated mechanical contact.
A traveller in Australia may encounter products regulated as therapeutic goods. In New Zealand, a product may refer to the joint standard while operating within a different regulatory setting. This page is therefore a label-reading reference, not a statement that every pack in either country is subject to identical market controls. See this publication’s The Australian standard for the related standards note, and Buying sunscreen abroad for a wider traveller checklist.
Decision rule: what to do with an unfamiliar label
- Find the jurisdictional wording. “Water Resistant (40 minutes)” or “Water Resistant (80 minutes)” points to the FDA format. “Water resistant” or “very water resistant” without a duration may reflect the UK or EU recommendation. A duration up to 240 minutes may indicate AS/NZS 2604.
- Treat the time as an upper test interval, not a schedule for ignoring change. Plan to reapply by the stated interval when you are in and out of water. Reapply sooner after drying or clear disturbance.
- Read UVA or broad-spectrum language separately. A water claim answers a retention question. It does not itself establish broad UV coverage.
- Count physical removal as a reset. Towel drying, rubbing sand away, pulling on a wetsuit, adjusting a lifejacket, and wiping the face can remove or shift the film. None is represented by the standard water test.
- Use activity conditions, not the label alone. If hands are wet or you cannot apply evenly, solve that practical problem before relying on a fresh application. The field note How to reapply sunscreen with wet hands addresses this situation.
This rule is intentionally conservative because labels cannot record what happened to an individual application. Water resistance measures a specified test outcome, whereas real use includes missed areas, too little product, intermittent drying and contact with equipment. The separate field note Reapplication gives the publication’s general timing guidance without confusing sweat, immersion and abrasion.
Limits of this reference
This page covers only water-related sunscreen claims in the UK and EU cosmetics framework, the United States FDA framework, and the AS/NZS 2604 standard used in Australia and New Zealand. It does not cover every national sunscreen rule, local language requirement, import rule, aerosol rule, or any individual product formulation. It also does not assess which sunscreen to buy, compare products, or provide medical advice.
The table does not say that a person will retain a particular percentage of protection in real life. The quoted percentages are test thresholds, measured through the named methods. They should not be converted into an estimate of exposure after swimming, towelling off or wearing water-sports equipment. Likewise, a water-resistance duration is not a measure of resistance to sweat, despite the common overlap between hot weather, exercise and water activity. The distinction is covered in this publication’s separate note Water vs sweat vs rub.
It does not apply as a substitute for individual clinical advice, nor does it cover people whose clinician has given specific sun-avoidance or treatment instructions. It also cannot determine whether a pack sold abroad is genuine, current, legally supplied or correctly stored. Where wording is unfamiliar, the safe reading is narrow: identify the regulatory system, take the stated immersion interval at face value, and do not infer protection against conditions the test does not include.