Two snorkeling spots, two islands, very different bacteria levels.
The Hawaii Department of Health recommends staying out of the ocean for at least 72 hours after heavy rain. Rain washes bacteria from cesspools, animal waste, and urban contamination into streams and the ocean. Check Safe to Swim Hawaii before every beach visit.
| Feature | Big Island Kahaluʻu | Oʻahu Kahaluʻu |
|---|---|---|
| Island | Hawaiʻi (Big Island) | Oʻahu |
| Location | Kona coast, Aliʻi Drive | Kaneohe, windward side |
| Known For | Famous snorkeling spot | Residential/harbor area |
| Bacteria Rate | 92% test failure | Variable |
| Tourist Draw | High | Low |
When tourists search for "Kahaluu snorkeling," they almost always mean the Big Island location. Kahaluʻu Beach Park in Kona is one of the most accessible snorkeling spots in Hawaiʻi, with shallow reefs, calm water, and frequent sea turtle sightings.
However, this Kahaluʻu also has a 92% bacteria test failure rate. Cold freshwater springs discharge through the porous lava rock, carrying bacteria from thousands of upslope cesspools directly into the bay. This is a chronic, geological condition — not something that clears up after dry weather.
Top-rated experiences in the area.
Tours via Viator and GetYourGuide. We may earn a commission at no extra cost to you.
Free alerts when water quality changes.
No spam. Just safety alerts.
100+ beaches across all islands
⚠️ 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.
When in doubt, don't go out. 🤙