Water quality status and bacteria risk rating
📍 Kekaha Kai State Park, North Kona, Hawaiʻi Island
Mahāʻiula Beach enjoys excellent water quality due to its remote location and lack of nearby development. Kekaha Kai State Park's lava coastline has no streams, no development runoff, and no wastewater infrastructure nearby. The leeward Big Island coast receives very little rainfall, further minimizing pollution risk.
The DOH does not regularly test this beach given its remote nature, but the physical conditions (no development, no streams, open ocean exposure) indicate consistently low bacteria risk. The primary safety concern here is ocean hazards — currents and surf — not water quality.
Based on: No nearby development, no stream input, leeward location, very low rainfall, open ocean exposure
The Department of Health recommends staying out of the ocean for at least 72 hours after heavy rain. Mahāʻiula is one of the driest beaches in Hawaii — but even on the leeward coast, flash flooding events can occasionally wash debris into the ocean. Given the remote location, always inspect the water visually before entering.
Turn off Highway 19 onto the unmarked lava road approximately 2 miles north of the Kona Airport (look for the state park sign). A high-clearance 4WD vehicle is strongly recommended — rental car agreements typically do not cover this road.
Alternatively, park at the main Kekaha Kai trailhead and hike approximately 1.5 miles along the coast. Bring water, sunscreen, and snacks — there are no vendors or shade at the beach.
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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 Department of Health Clean Water Branch before entering the water.
When in doubt, don't go out. 🤙