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KAUAI · NORTH SHORE

Anini Beach

Water quality status and bacteria risk rating

📍 North Shore Kauaʻi, near Princeville. About 30 min from Lihue.

Checking live advisories…
If It Looks Brown, Don't Swim
Never enter the ocean when the water appears brown or murky, even if no advisory is posted. Hawaii is often slow to test beaches and update advisories — not every beach is monitored. After heavy rain, wait at least 72 hours and until the water clears before swimming.
Learn more about brown water advisories →
Historical Bacteria Risk
⚠ Historical rating — this is based on long-term testing data, not current conditions. The state of Hawaii is often slow to test beaches and update advisories. Always check the water yourself and avoid brown or murky water.
Moderate-Low Risk 2 / 5

Anini Beach has generally clean water quality. Protected by the longest fringing reef in Hawaiʻi, Anini Beach features calm, shallow water that is popular for snorkeling and families.

The reef provides excellent wave protection but also means slower water circulation compared to open-ocean beaches. Anini Stream can carry agricultural and residential runoff after rain, which temporarily raises bacteria levels in the reef-protected lagoon. During dry weather, water quality is consistently good. The lagoon takes longer to flush after storms than open-ocean beaches.

Based on: Reef-protected circulation, Anini Stream proximity, DOH monitoring data

⚠️ The 72-Hour Rain Rule

After heavy rain, the Department of Health recommends staying out of the ocean for at least 72 hours. Anini Beach is particularly sensitive to rain because the protective reef slows the flushing of runoff from Anini Stream. Bacteria levels can remain elevated longer here than at open-ocean beaches. Kauaʻi's North Shore receives significant rainfall — always check conditions after any storm.

Anini Beach Area Hotels — Historical Beach Water Quality
🏨 1 Hotel Hanalei Bay (St. Regis)
Princeville, 10 min drive west
Mod-Low
🏨 Westin Princeville
Princeville resort area, 10 min drive
Mod-Low
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⚠️ Important Disclaimer

Safe to Swim Hawaii is an independent passion project — it is not affiliated with the Hawaii Department of Health or any government agency. Water quality ratings on this site are estimates based on publicly available testing data and geographic analysis. They are not real-time measurements and may not reflect current conditions. “No DOH Alerts” means no advisory is currently posted — it does not mean the water was tested and found safe. DOH only monitors a fraction of Hawaii’s beaches, and some areas have no regular testing at all.

Always verify current water quality conditions with the Hawaii Department of Health Clean Water Branch before entering the water. This site is for informational purposes only and should not be the sole basis for any swimming decisions.

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