Where reef-safe sunscreen is actually required

Hawaii, Key West, the US Virgin Islands, Palau, Bonaire and Aruba restrict specific sunscreen filters — most commonly oxybenzone and octinoxate, with some going further. A mineral sunscreen whose only actives are zinc oxide and/or titanium dioxide satisfies every one of them. Rules vary in scope: some cover sale only, others cover import and possession.

Restrictions change, and new jurisdictions are added periodically, so confirm before you travel rather than relying on a list. What does not change is the ingredient rule: mineral-only passes everywhere.

The restrictions, destination by destination

The US Virgin Islands and Palau are the two to pay closest attention to, because their rules extend to what you bring with you rather than only to what shops may sell. Everywhere else, a bottle already in your bag is generally not the thing being regulated — though it is still the thing the legislation is about.

Places with strong guidance but no ban

Many marine parks, dive operators and resorts request or require mineral sunscreen without any legislation behind it. Mexico's cenotes and several protected areas in Quintana Roo are the most commonly encountered example — operators frequently ask visitors to rinse off chemical sunscreen or use mineral only, and that request has no statutory force but is generally enforced at the gate.

Australia's Great Barrier Reef, Thailand's marine national parks and a range of Caribbean protected areas have varying guidance. The practical answer is the same everywhere: take mineral and the question never arises.

What to pack

1. A mineral body lotion with 80 minutes of water resistance, in a size large enough for the trip. Replacing it locally is possible but expensive in restricted destinations.
2. A mineral face formula, since body lotion on a face for a week is unpleasant. Face picks.
3. A stick for noses, ears and the tops of feet, which burn first in strong sun.
4. A [UPF 50+ rash guard](/sun-protective-gear/best-sun-shirts), which covers the torso and means less product in the water.
5. A wide-brim hat. Sun hats.

Check the actives panel of anything already in your bag before you pack it. A bottle you have used for two summers may well contain oxybenzone. How to read a sunscreen label.

Buying at your destination

In restricted jurisdictions, local shops stock compliant products because they are not permitted to sell the alternatives — so buying on arrival is straightforward, if more expensive than at home. The less reliable purchase is at an airport or a resort shop just outside the jurisdiction, where the restrictions do not apply and reef-safe branding still appears freely.

Why these rules exist

Laboratory research demonstrated that oxybenzone harms coral larvae and contributes to bleaching at measurable concentrations, and that is the evidence legislators acted on. NOAA presents the findings alongside their limits.

Worth keeping the scale honest: ocean warming is the dominant driver of coral loss globally. Complying with these rules is a sensible precaution in exactly the kind of concentrated swimming areas where the concentration argument is strongest — and it is also simply the law where it applies. Reef-safe versus reef-friendly argues both sides.