Is Kanaha Beach safe to swim?

Kanaha Beach has a Moderate-Low bacteria risk rating (2 out of 5). Water quality is generally acceptable, though the beach is near Kahului Harbor and can be affected by urban runoff from the Kahului area after rain. The beach is best known as Maui's premier windsurfing and kiteboarding destination rather than a swimming beach.

What is the water quality like at Kanaha Beach?

Kanaha Beach generally has moderate-low bacteria risk. The area has decent ocean flushing from the trade winds and waves, but its proximity to Kahului town and the harbor means urban runoff can affect water quality after heavy rain. The beach is adjacent to a wildlife sanctuary and wetland area which can also contribute to elevated nutrient levels.

When is the best time to visit Kanaha Beach?

For water quality, visit during dry weather and avoid swimming for 72 hours after heavy rain. For windsurfing and kiteboarding, the best wind conditions are typically from late morning through afternoon, with the strongest and most consistent winds from April through September. Mornings are usually calmer if you prefer swimming or stand-up paddleboarding.

Is Kanaha Beach near Kahului Airport?

Kanaha Beach Park is one of the closest beaches to Kahului Airport (OGG), located just about 2 miles away or a 5-minute drive. This makes it a convenient stop if you have time before a flight or want to visit a beach right after arriving on Maui. The beach has parking, restrooms, and picnic facilities.

← All beaches & hotels

MAUI · NORTH SHORE

Kanaha Beach Park

Q: What is Kanaha Beach known for?

Kanaha Beach Park is Maui's top destination for windsurfing and kiteboarding, thanks to the strong, consistent trade winds that blow across the North Shore. The beach has a long, sandy shoreline with a reef-protected inner area that provides relatively flat water for beginners. It is located just minutes from Kahului Airport, making it a popular first or last stop for visitors.

Water quality status and bacteria risk rating

📍 Kahului, Maui — windsurfing & kiteboarding hub

Checking live advisories…

Community Water Testing

The Hawai‘i Department of Health does not run routine bacteria-testing here. The readings below come from the Surfrider Foundation’s volunteer Blue Water Task Force, which fills coverage gaps DOH doesn’t reach.

Community Testing · Surfrider BWTF

Kanahā - Kalialinui Stream

Last sample 2026-04-15 · view full report →

20 MPN/100mL

within threshold

About: Volunteer water-quality monitoring by the Surfrider Foundation's Blue Water Task Force. Method: IDEXX Enterolert (MPN/100mL). Threshold: 130 MPN/100mL Beach Action Value — matches Hawaii DOH. Sampling: monthly (Kauaʻi/Maui), biweekly (Oʻahu).

Source: Surfrider Foundation Blue Water Task Force · Updated 2026-05-15

⚠

If It Looks Brown, Don't Swim

Never enter the ocean when the water appears brown or murky, even if no advisory is posted. Hawaii is often slow to test beaches and update advisories — not every beach is monitored. After heavy rain, wait at least 72 hours and until the water clears before swimming.

Learn more about brown water advisories →

Historical Bacteria Risk

⚠ Historical rating — this is based on long-term testing data, not current conditions. The state of Hawaii is often slow to test beaches and update advisories. Always check the water yourself and avoid brown or murky water.

Moderate-Low Risk 2 / 5

Kanaha Beach Park is Maui's premier windsurfing and kiteboarding destination with generally acceptable water quality. The beach has a long sandy shoreline with a reef-protected inner area. Strong trade winds help with water circulation and flushing.

Located near Kahului town and the airport, the beach can be affected by urban runoff after heavy rain. The adjacent Kanaha Pond Wildlife Sanctuary (a wetland area) can also contribute to elevated nutrient levels. Avoid swimming after storms when runoff from the Kahului area may impact water quality.

Based on: DOH beach monitoring, proximity to Kahului urban area, trade wind flushing, adjacent wetland

⚠️ The 72-Hour Rain Rule

The Department of Health recommends staying out of the ocean for at least 72 hours after heavy rain. Kanaha Beach is near the Kahului urban area, so runoff after storms can carry pollutants into the ocean. Always check the water visually before entering.

Book Tours & Activities

Top-rated experiences near this beach. Check water quality above, then plan your trip.

Windsurfing Lesson

Learn to windsurf at Maui's top wind sport beach

Viator

Kiteboarding Lesson

Beginner kiteboarding in Maui's consistent trade winds

Viator

Maui Whale Watching Tour

Seasonal whale watching from Kahului Harbor

Viator

🦈 Compare Tours & Prices

Browse top-rated Maui tours. Multiple operators, reviews, and instant confirmation.

GetYourGuide

Tours listed via Viator and GetYourGuide. Safe to Swim Hawaii may earn a commission if you book, at no extra cost to you.

Related Guides

Baldwin Beach Water Quality

Nearby →

Hoʻokipa Beach Water Quality

Nearby →

Swimming After Rain in Hawaii

Guide →

Maui Beach Closures

Guide →

Hawaii Brown Water Advisory Guide

Guide →

Maui East Side Beaches Guide

Region →

Wailea Beach Water Quality

Nearby →

Kaʻanapali Beach Water Quality

Nearby →

Maui Beach Guide

Island → Baldwin Vs Kanaha — Water Quality Compared→ Hookipa Vs Kanaha Wind — Water Quality Compared→

Kanaha Beach Park Water Quality by Month

January February March April May June July August September October November December

Get Beach Safety Alerts

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.

Check all Hawaii beaches & hotels →

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. 🤙