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Reef-Safe Sunscreen in Hawaiʻi: What the Law Says and What to Pack

What Hawaiʻi’s sunscreen law actually requires, what “reef-safe” labels mean, and what to look for instead.

By the Travel Oahu Local Style Editorial Team Updated 2 min read
A green sea turtle swimming over coral
Photo: Jonathan Ikemura on Unsplash

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In this guide7 sections
  1. What’s required on Oʻahu
  2. What “reef-safe” on the label means
  3. What to look for
  4. Use less sunscreen in the first place
  5. Buying on Oʻahu
  6. Frequently asked questions
  7. While you’re nearby

Hawaiʻi was the first US state to restrict sunscreen ingredients to protect coral reefs. If you’re packing for Oʻahu, here’s what the law actually says, what “reef-safe” labels do and don’t mean, and what to look for instead.

What’s required on Oʻahu

Hawaiʻi’s Act 104, passed in 2018, bans the sale and distribution in Hawaiʻi of sunscreens containing oxybenzone or octinoxate without a prescription. It took effect on January 1, 2021.

  • The state law limits what can be sold; it doesn’t fine visitors for wearing a sunscreen they bought elsewhere.
  • Maui County goes further and restricts the sale and use of non-mineral sunscreens, and Hawaiʻi County restricts their sale. If your trip includes those islands, mineral sunscreen keeps things simple.

What “reef-safe” on the label means

“Reef-safe” and “reef-friendly” aren’t regulated terms. A product can use them and still contain ingredients researchers are concerned about. Read the active ingredients instead of trusting the front of the bottle.

What to look for

  • Mineral active ingredients: zinc oxide and/or titanium dioxide.
  • “Non-nano” particles, which many reef-conservation groups prefer.
  • Water resistance (40 or 80 minutes), and reapply after swimming.
  • No oxybenzone or octinoxate — required for anything sold in Hawaiʻi.

Use less sunscreen in the first place

The most reef-friendly sunscreen is the one you don’t need. A long-sleeve rash guard, a wide-brimmed hat and shade at midday cut how much you apply — and how much washes off into the water.

Buying on Oʻahu

Because of the law, sunscreens sold in Hawaiʻi stores shouldn’t contain oxybenzone or octinoxate, and mineral options are widely stocked in drugstores and ABC Stores. Buying before you fly mostly helps with price and choice.

Frequently asked questions


Will I be fined for using regular sunscreen on Oʻahu?

The state law bans the sale of sunscreens with oxybenzone or octinoxate; it doesn’t fine individuals for using them. Using a mineral sunscreen is still the respectful choice.


Is zinc oxide sunscreen reef-safe?

Mineral sunscreens with non-nano zinc oxide are generally considered the better option for reefs, though research is ongoing. Covering up with clothing is the lowest-impact choice.


Do I need special sunscreen for Hanauma Bay?

Hanauma Bay asks visitors to protect the reef. Mineral sunscreen and a rash guard are the simplest approach.


While you’re nearby

Swimmers and the shallow reef at Hanauma Bay seen from the overlookThe Best Snorkeling Beaches on Oʻahu, by Season and Skill LevelHanauma Bay’s sheltered, reef-filled cove seen from aboveHanauma Bay: Reservations, Snorkeling Tips and What to BringBeach towel, tote bag and sunglasses laid out on the sandWhat to Pack for Oʻahu: A Practical Packing List by ActivityGreen valley below the Koʻolau mountains with the windward coast in the distancePlan Your Oʻahu Trip: A Practical Planning Guide
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