August 2023 wildfire, March 2026 wastewater spill, and ongoing runoff concerns.
The Hawaii Department of Health recommends staying out of the ocean for at least 72 hours after heavy rain. Lahainaʻs nearshore waters face compounding challenges: post-fire debris runoff, a 200,000-gallon wastewater spill in March 2026, and ongoing reconstruction. Monitor advisories closely.
August 8, 2023: Lahaina wildfire destroys over 2,000 structures, kills 101 people. The deadliest US wildfire in over a century.
2023-2025: Demolition and debris removal. Heavy metals detected in soil and runoff. EPA Superfund-level cleanup.
2025-2026: Rebuilding begins. Construction runoff adds sediment to nearshore waters during rain.
March 2026: ~200,000 gallon wastewater spill in Lahaina area. DOH advisories issued.
Post-fire runoff is not ordinary stormwater. When structures burn, they release heavy metals (lead from pipes and paint, arsenic from treated wood, chromium from appliances), asbestos from older buildings, and chemical compounds from plastics and electronics. Rainfall carries these through the soil and drainage channels into the ocean. This is in addition to the normal bacteria contamination from damaged sewer lines and cesspools.
Most affected: Hanakaoʻo Beach Park (Canoe Beach), beaches directly fronting old Lahaina town, and any beach near drainage channels running through the burn zone.
Moderately affected: Southern Kaʻanapali Beach (near the border with Lahaina), especially after rain.
Least affected: Northern Kaʻanapali (Black Rock area and north), Napili Bay, Kapalua Bay. These are upstream of the burn zone and separated by distance.
West Mauiʻs resort areas remain open and operational. Kaʻanapali, Napili, and Kapalua continue to welcome visitors. The key precaution is monitoring water quality closely, especially after rain. Post-fire contamination compounds the normal rain-runoff bacteria concerns. Northern West Maui beaches (Napili Bay, Kapalua Bay) are your best options during periods of active advisories in the Lahaina area.
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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.
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