Akaka Falls State Park, Big Island — ranked by water quality and bacteria risk
ʻAkaka Falls State Park is home to one of Hawaii's most famous waterfalls, a 442-foot cascade plunging into a lush gorge surrounded by tropical bamboo forest and wild orchids. The park sits on the Hamakua Coast north of Hilo, a stretch of the Big Island's windward shore known for its dramatic sea cliffs, rainforest valleys, and sugar plantation history.
The Hamakua Coast does not have traditional sandy beaches — the shoreline is primarily rocky sea cliffs with occasional river mouths and black rock shelves. The nearest swimmable beaches are in Hilo, about 20 to 30 minutes south, or at the few rocky access points along the coast. Heavy rainfall on this windward coast means stream-influenced water quality is a common concern, and checking conditions after rain is especially important.
From ʻAkaka Falls State Park, the Hilo beaches are about 20 to 30 minutes south on the Hawaii Belt Road (Hwy 19). Richardson Beach and the other Hilo bayfront beaches are along Kalanianaole Avenue on the eastern side of Hilo. For the Hamakua Coast access points, these are scattered along the highway between ʻAkaka Falls and Hilo, often requiring local knowledge to find. A car is essential as there is no public transit connecting these areas.
Best for turtles: Richardson Beach (black sand, Hilo, 25 minutes south). Best for snorkeling: Carlsmith Beach area (spring-fed, calm). Best water quality: Check conditions carefully on this coast — heavy rainfall affects all Hamakua and Hilo beaches. Closest: River mouth spots along the Hamakua Coast (experienced swimmers only).
After heavy rain, bacteria levels spike at beaches near streams and river mouths. If a brown water advisory is active near Akaka Falls State Park, Big Island:
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⚠️ 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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