Hualalai to Hapuna: each resort has its own beach cove, and every one is public.
The Hawaii Department of Health recommends staying out of the ocean for at least 72 hours after heavy rain. The Kohala Coast is Big Island’s driest area, receiving less than 10 inches of rain per year. This makes it one of the most consistently clean swimming areas in all of Hawaiʻi.
The Kohala Coast stretches for about 30 miles along the Big Island’s dry northwestern shore, from Keahole Point north to Kawaihae Harbor. It is the driest inhabited coastline in Hawaiʻi, receiving less than 10 inches of rainfall per year. The landscape is dramatic: barren black lava fields punctuated by lush green resort oases.
This is Big Island’s luxury resort corridor. Five major resort complexes — Hualalai, Waikoloa, Mauna Lani, Mauna Kea, and Hapuna — are spread along the coast. The area draws golfers, honeymooners, and families who want a high-end Hawaiʻi experience with reliable sunshine.
The extreme dryness gives the Kohala Coast some of the best water quality in all of Hawaiʻi. With almost no rainfall, there is almost no stormwater runoff to carry bacteria into the ocean. Ancient Hawaiian fishponds and petroglyph fields dot the coast between resorts.
Hapuna Beach — One of Hawaiʻi’s largest white sand beaches. State recreation area with lifeguards. Strong shorebreak in winter.
Mauna Kea Beach (Kaunaʻoa Bay) — Iconic crescent beach. Limited to 30 public parking spots that fill by 8am.
Anaehoomalu Bay (A-Bay) — Wide crescent fronting Waikoloa. Kayaking, snorkeling on the south reef, ancient fishponds.
Mauna Lani Beach — Small coves near the resort. Historic fishponds, petroglyph trail.
The Kohala Coast stretches along Big Island’s dry northwest shore, from Hualalai in the south to Hapuna in the north. Built on ancient lava flows, each resort complex has its own carved-out beach cove. The landscape is stark black lava with green oases at each resort. Less than 10 inches of rain falls here annually, giving the Kohala Coast some of the cleanest ocean water in Hawaiʻi.
Resort: Four Seasons Resort Hualalai
Beach: Kaʻūpūlehu Beach — small, calm, excellent snorkeling. King’s Pond (man-made pool carved from lava).
Access: Most exclusive on the coast. Public access exists but is not well-marked.
Hotels: Hilton Waikoloa Village, Marriott Waikoloa Ocean Club, shopping at Kingsʻ Shops and Queensʻ MarketPlace
Beach: Anaehoomalu Bay (A-Bay) — wide crescent beach, good for swimming, kayaking, and snorkeling on the south reef.
Warning: Do NOT confuse with Waikoloa Village — that is 15 minutes inland with no beach. See our guide →
Hotels: Mauna Lani Auberge Resorts Collection
Beach: Small beach coves, historic fishponds, Puakō reef area nearby for snorkeling.
Character: More nature-focused. Petroglyph trail, fishpond restoration. Less beach-centric than Waikoloa or Mauna Kea.
Hotels: Mauna Kea Beach Hotel (Kaunaʻoa Bay), Westin Hapuna Beach Resort
Beaches: Kaunaʻoa Bay is an iconic crescent — calm, white sand, limited access (30 public parking spots). Hapuna Beach is one of Hawaiʻi’s largest white sand beaches — state park, lifeguards, strong shorebreak in winter.
Note: Same resort complex but very different beaches. Kaunaʻoa = calm, protected. Hapuna = open, powerful.
The Kohala Coast has arguably the best ocean water quality of any resort area in Hawaiʻi. Less than 10 inches of annual rainfall means virtually no stormwater runoff. DOH bacteria testing consistently shows very low Enterococcus counts, well below the advisory threshold.
Four Seasons Resort Hualalai — The most exclusive resort on the coast. Small private beach, King’s Pond carved from lava.
Hilton Waikoloa Village — Massive 62-acre resort with monorail, boat canal, and dolphin lagoon.
Mauna Lani, Auberge Resorts Collection — Renovated luxury resort focused on Hawaiian culture and nature.
Mauna Kea Beach Hotel — Classic luxury hotel on Kaunaʻoa Bay. One of the original Kohala Coast resorts (opened 1965).
From Kona Airport (KOA): Waikoloa is about 25 minutes north, Mauna Lani 30 minutes, Hapuna/Mauna Kea 35 minutes via Queen Kaʻahumanu Highway (Hwy 19).
Parking: Hapuna Beach State Recreation Area has a large lot ($5). A-Bay at Waikoloa has a public lot. Mauna Kea limits non-guest parking to about 30 spaces — arrive before 8am.
Important: Do NOT confuse Waikoloa Beach Resort (coastal) with Waikoloa Village (inland, 15 min from coast, no beach). Read our guide →
The Kohala Coast is a year-round destination with remarkably consistent weather. Daytime temperatures range from 80-88°F year-round. The calmest ocean conditions are May through September. For the best value, visit September, October, or early November.
Top-rated experiences in the area.
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Every beach page on this site includes a historical bacteria risk rating from 1 (low) to 5 (high), based on DOH testing data, Surfrider Foundation monitoring, geographic factors like stream proximity and cesspool contamination areas, and historical advisory frequency. These ratings reflect long-term patterns — not current conditions. Always check the live advisory status at the top of each beach page before swimming.
The Hawaii Department of Health monitors approximately 57 beaches statewide through its Tier 1 and Tier 2 testing programs. Many popular beaches have no regular testing. This site aggregates data from DOH, USGS stream monitoring, NOAA ocean conditions, and NWS weather alerts to provide broader coverage.
After heavy rain, streams carry bacteria, sewage, pesticides, and sediment into the ocean. Bacteria levels can be dangerously high even when the water appears clear. The DOH recommends waiting at least 72 hours after heavy rain before swimming, especially near stream mouths and canal outlets.
Beaches on dry, leeward coasts typically recover faster than beaches near major stream outlets. Open ocean beaches with strong wave action flush contamination more quickly than sheltered bays and lagoons.
100+ beaches across all islands
Safe to Swim Hawaii aggregates water quality data from six independent sources to provide broader coverage than any single agency. Our sources include the Hawaii Department of Health Clean Water Branch (beach advisories and bacteria testing), USGS National Water Information System (25 stream monitoring stations across all islands), NOAA CO-OPS (tide levels and water temperature), NDBC (wave buoys and ocean conditions), NWS Honolulu (weather and marine alerts), and City & County of Honolulu Environmental Services (Kailua Bay water testing and spill reports).
Historical bacteria risk ratings on this site are based on DOH testing data, Surfrider Foundation monitoring, geographic analysis (stream proximity, cesspool contamination areas, coastal development), and advisory frequency. These are historical assessments, not live measurements. Always check the live advisory status at the top of each page and verify conditions with the Hawaii DOH Clean Water Branch before entering the water.
Less rainfall means less runoff and generally cleaner ocean water across all islands. Stream flows drop, reducing bacteria transport to coastal areas. This is typically the best time for ocean water quality, though localized contamination from cesspools and urban runoff can still occur.
Frequent heavy rain events cause stream flooding, sewage overflows, and brown water advisories. Windward and north-facing coasts receive more rain. The DOH issues the most advisories during this period. Leeward coasts (west-facing) generally stay drier and cleaner year-round.
Water quality patterns vary significantly by location. Beaches near stream mouths and urban areas show the most dramatic seasonal variation. Open ocean beaches with strong wave action maintain better water quality year-round. Check individual beach pages for location-specific seasonal data.
Hawaii has approximately 88,000 cesspools — more than any other U.S. state. These underground chambers collect untreated household sewage and allow it to leach into the surrounding soil and groundwater. In coastal areas, this contaminated groundwater eventually reaches the ocean through submarine groundwater discharge, contributing to elevated bacteria levels at nearby beaches.
Hawaii Act 125 (2017) requires all cesspools to be upgraded or converted to approved septic systems by 2050. Priority areas near the coast and drinking water sources are being addressed first, but progress has been slow. Beaches in known cesspool contamination zones carry elevated bacteria risk even during dry weather. For more information, see our comprehensive cesspool guide.
⚠️ Important Disclaimer
Safe to Swim Hawaii is an independent passion project — not affiliated with the Hawaii Department of Health or any government agency. Water quality ratings are estimates based on publicly available testing data and geographic analysis. They are not real-time measurements and may not reflect current conditions.
Always verify current water quality conditions with the Hawaii DOH Clean Water Branch before entering the water.
This site does not recommend or advise anyone to swim at any beach. We share government data and geographic analysis so you can make your own informed decisions. By using this site you accept full responsibility for your own safety. See our Terms of Use for full details.
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