Ranked by DOH bacteria testing data and water quality analysis
The Hawaiʻi Department of Health tests beach water for enterococci bacteria — the federal indicator of fecal contamination. The safety threshold is 130 CFU per 100 mL. This ranking uses long-term testing data, geographic analysis, and proximity to pollution sources to identify the cleanest beaches across all islands.
The dry Kohala Coast receives under 10 inches of rain annually. Combined with open-ocean exposure, Hapuna consistently tests among the lowest bacteria levels in the state.
Surrounded by barren lava fields with zero nearby development. Virtually no runoff sources make this one of the purest swimming beaches in the state.
South Maui’s arid climate produces very little runoff. Modern resort wastewater infrastructure and open-ocean flushing keep bacteria levels consistently low.
Sheltered bay with minimal runoff and good natural flushing. Consistently clean water with world-class snorkeling conditions.
Wide open beach far from development. Powerful waves provide strong flushing. Minimal pollution sources in the surrounding area.
Crystal-clear water with strong tidal flushing through the Mokulua Islands channel. Residential area but minimal direct runoff into the bay.
Kauaʻi’s dry south shore receives a fraction of the rainfall the north shore gets. Consistently low bacteria with protected swimming area and lifeguards.
Long, wide beach with excellent open-ocean exposure. Low-density surrounding area means minimal runoff. Consistently clean water.
Marine preserve with minimal human impact. Extremely low development on Lānaʻi means virtually no pollution sources. World-class snorkeling.
Military beach open to public on weekends. Limited development and access restrictions help maintain excellent water quality. Beautiful ironwood tree-lined shore.
Less rainfall means less runoff washing bacteria into the ocean. South Maui, Kohala Coast, and south Kauaʻi are the driest coastal areas.
Streams carry bacteria, sediment, and nutrients from upland areas. Beaches away from stream mouths consistently test cleaner.
Strong currents and wave action flush nearshore water quickly, preventing bacteria from accumulating.
Less urban and agricultural development means fewer cesspools, septic systems, and stormwater drains contributing contamination.
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100+ beaches and 25+ hotels across all 6 islands
⚠️ 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.
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. 🤙