Check live DOH advisory status — bacteria risk rating, post-fire runoff conditions, stream drainage, and 72-hour rain rule
📍 On Maui's west coast in the town of Lahaina, south of Kaʻanapali
Lahaina Beach water quality today: This beach carries a moderate-high 3/5 historical bacteria risk due to Lahaina Stream outlets, urban runoff, historical cesspool issues, and ongoing post-fire contamination. DOH issued an advisory in April 2025 after heavy rain runoff. The shallow, reef-protected area is popular with families but is slower to flush than open-coast beaches. After rain: wait at least 72 hours. Construction runoff from Lahaina rebuilding adds additional risk. If the water looks brown or murky, stay out regardless of what any advisory says. Check live advisory status above and make your own judgment.
West Maui offers world-class snorkeling, whale watching, and sunset cruises. When water conditions are clear, Lahaina Harbor is the departure point for many tours.
Tours listed via Viator and GetYourGuide. Safe to Swim Hawaii may earn a commission if you book, at no extra cost to you.
Lahaina Beach sits near stream outlets south of the town of Lahaina on West Maui. The beach had a DOH advisory in April 2025 due to heavy rain runoff. The shallow, reef-protected area is popular with families but is slower to flush than open-coast beaches.
The August 2023 Lahaina wildfire devastated the town, and rebuilding is ongoing. Water quality has been affected by fire debris, ash runoff, construction activity, and disrupted wastewater infrastructure. Historical cesspool issues in the Lahaina area add to the contamination risk for nearshore waters.
Based on: DOH beach monitoring, Lahaina Stream proximity, post-fire contamination context, cesspool/injection well history, geographic risk assessment
The August 8, 2023 Lahaina wildfire was the deadliest U.S. wildfire in over a century. It destroyed most of historic Lahaina town and significantly impacted the surrounding environment, including nearshore water quality.
How the fire affects water quality: Burned land loses its vegetation and soil stability. When it rains, water runs off faster and carries ash, heavy metals, and debris into streams and the ocean. Lahaina Stream, which outlets near the beach, now drains through the fire-affected zone. Demolition and rebuilding activity adds construction sediment and materials to the runoff.
Damaged infrastructure: The fire disrupted wastewater systems in the Lahaina area. Combined with West Maui's pre-existing cesspool issues — thousands of cesspools release partially treated wastewater that can seep into groundwater — the contamination risk for nearshore waters is elevated above pre-fire levels.
Recovery timeline: Post-wildfire water quality impacts can persist for years. Vegetation regrowth, infrastructure repair, and cesspool conversion are all ongoing. Conditions are expected to gradually improve, but rain events will continue to mobilize residual contaminants from the burn zone for the foreseeable future.
Outlets south of the main beach area. Carries urban runoff, post-fire debris, and sediment into nearshore waters after rain. The stream now drains through the fire-damaged zone, increasing contamination risk compared to pre-fire conditions.
Large-scale demolition and rebuilding of Lahaina town generates disturbed soil, building materials, and debris. Rain events can wash construction sediment through storm drains and streams onto the beach. This is an elevated risk that will persist throughout the rebuilding period.
West Maui has thousands of cesspools that release partially treated wastewater into groundwater. A landmark court case confirmed that injection wells at the Lahaina Wastewater Reclamation Facility polluted nearshore waters. Conversion to modern systems is underway but far from complete.
Streets, parking areas, and developed land in the Lahaina area generate stormwater runoff that carries oil, fertilizer, and bacteria into the ocean. The reef-protected, shallow nearshore zone is slower to flush this contamination than open-coast beaches.
Less rainfall means less runoff through Lahaina Stream. Water quality tends to be better across the beach. Trade winds from the northeast keep conditions pleasant on the leeward coast. Best time for ocean activities.
Kona storms and southerly swells can bring heavy rain to West Maui. Rain washes post-fire debris and urban runoff into the ocean. Brown water events are more common. The shallow reef-protected area is slower to clear after contamination.
West Maui's leeward coast receives less rainfall than the windward side, but Kona storms can deliver heavy rain and significant runoff events.
The Hawaii Department of Health recommends staying out of the ocean for at least 72 hours after heavy rain, even if the water looks clear. At Lahaina Beach, this is especially important because Lahaina Stream carries post-fire runoff from the burn zone and rebuilding sites. The reef-protected, shallow waters are slower to flush contamination than open-coast beaches. After storms, the area near the stream outlets will be most affected.
Free alerts when water quality changes at your beach — brown water advisories, bacteria warnings, and all-clear notices.
No spam. Just safety alerts for your trip.
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. “No DOH Alerts” means no advisory is currently posted — it does not mean the water was tested and found safe. DOH only monitors a fraction of Hawaii’s beaches, and some areas have no regular testing at all.
Always verify current water quality conditions with the Hawaii Department of Health Clean Water Branch before entering the water. This site is for informational purposes only and should not be the sole basis for any swimming decisions.
This site is a work in progress and we want to make it better. If you notice something that isn't working right, have a suggestion, or want to share local knowledge about a beach, please reach out.
This site does not recommend or advise anyone to swim at any beach. We share government data and geographic analysis so you can make your own informed decisions. By using this site you accept full responsibility for your own safety. See our Terms of Use for full details.
When in doubt, don't go out. đ€