Water quality status & access guide — South Shore hidden gem
📍 South Shore, Kauaʻi · east of Poʻipu
Mahaulepu Beach is on Kauaʻi's drier South Shore, which helps keep baseline bacteria levels lower than the wet North Shore. The area receives significantly less rainfall than Hanalei or Haʻena, and the remote location means minimal urban runoff.
The main water quality concern is the Kawailoa stream that drains into the central section of the beach. After the rare heavy rain events that do affect the South Shore, this stream can carry bacteria into the ocean. Gillin's Beach at the western end, away from the stream, has the best water quality of the three beach sections.
Based on: South Shore dry climate, stream inputs at Kawailoa Bay, DOH area monitoring
Stay out of the ocean for at least 72 hours after heavy rain. While the South Shore is drier than North Kauaʻi, significant rain events do occur and can affect stream quality.
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⚠️ Important Disclaimer
Safe to Swim Hawaii is an independent passion project — not affiliated with the Hawaii Department of Health. Water quality ratings are estimates based on publicly available data and geographic analysis. They are not real-time measurements.
Always verify with the Hawaii DOH Clean Water Branch before entering the water.
When in doubt, don't go out. 🤙