Cleanest Maui Beaches Right Now

How This Ranking Is Calculated

Every Hawaii Department of Health advisory is a public record — Beach Advisories are issued when bacteria levels at a monitoring station exceed the EPA recreational threshold of 130 CFU/100 mL enterococcus, and Brown Water Advisories are issued when storm runoff makes coastal water visibly turbid.

We count the number of days each beach has been under any DOH advisory in the last 30 days. Fewer days under advisory means a higher rank. When a DOH advisory is island-wide (“Brown Water Advisory, Island of Maui”), every monitored beach on that island is counted as under advisory for those days. When an advisory is station-specific, only the matching beach is counted.

The ranking measures water quality exposure only — days under advisory. It is not a swim-safety rating. A beach can rank high here but still have strong currents, shore break, rip currents, or no lifeguards. Always check the individual beach page for physical-hazard information and live DOH status before you swim.

Why Wailea, Makena, and Keawakapu rank highest

Maui's water-quality ranking is driven by coastal climate more than any other island:

• South Maui rain shadow. Wailea, Makena, Keawakapu, and Kihei sit in the rain shadow of Haleakala — the Lahaina coast gets about 15 inches of rain per year, Wailea about 12. Less rain means almost no runoff events and almost no Brown Water Advisories. The only significant exposure is from the occasional Kona storm that brings weather in from the opposite direction.
• No major streams on the south/west shore. Unlike O'ahu's Ala Wai or Kaua'i's Hanalei, Maui's dry coasts are not intersected by significant perennial streams. The watersheds don't reach the tourist beaches. Kahului harbor (Lahaina area) is the exception — it catches urban discharge and periodically shows bacteria exceedances.
• North Shore absorbs the storms. Ho'okipa and the windsurf coast catch most Maui rainfall. During the rainy season these beaches can sit under Brown Water Advisory for weeks, while Wailea stays clean 5-7 miles to the south.
• West Maui is in between. Ka'anapali and Hanakao'o are drier than the North Shore but catch Lahaina town's runoff after rain. Historical averages put them between South Maui and North Shore.

For trip planners: Maui's water-quality patterns are the most predictable in Hawaii. If the forecast is dry and calm, almost every Maui beach will test clean. After a significant storm (especially a Kona Low from the southwest), South Maui can take 48-72 hours to clear while the North Shore may stay under advisory for a week or more. See Swimming After Rain for the per-rainfall-intensity wait-time guide.

Data Sources

This ranking is built from:

• Hawaii DOH Clean Water Branch public API — Beach Advisory and Brown Water Advisory events, including bacteria Count values when an advisory is issued.
• DOH station registry — the official list of monitoring stations, mapped to each beach page.
• EPA Recreational Water Quality Criteria — the 130 CFU/100 mL enterococcus threshold referenced throughout.

Every beach in this ranking has its own page with the 30-day daily-bar chart showing exactly which days were under which kind of advisory, plus live DOH status. Click the beach name to see its full history.

Which Maui beach has the cleanest water right now?

Based on the last 30 days of Hawaii DOH advisory data, Hanakao'o Beach Park is currently ranked #1 on Maui with 20/30 days clean. Maui's South Shore beaches (Wailea, Makena, Keawakapu) typically cluster at the top of this ranking because they sit in Haleakala's rain shadow — annual rainfall on that coast is 12-15 inches, compared to 70+ inches on the North Shore.

Is South Maui really that much cleaner than the rest of the island?

Structurally yes, though individual advisory events can temporarily flatten the ranking. South Maui's Wailea-Makena corridor gets roughly 15% of the rainfall that hits Ho'okipa on the North Shore. No significant streams reach the South Maui beaches. The resort wastewater is modern. On most 30-day windows, South Maui beaches rank 4-6 for the state, while Maui's North Shore ranks in the bottom half. See the ranking below for today's exact positions.

Does ’cleanest’ mean safe to swim on Maui?

No. Water quality ranks bacteria and advisory frequency — not physical hazards. Makena's Big Beach has notorious shore break. Ho'okipa can have 15+ foot winter waves. The West Maui cliffs have fewer developed beaches and stronger currents. Always check physical conditions and DOH advisories together before swimming.

Which Maui shore has the best water quality overall?

South Maui (Wailea, Makena, Kihei) consistently ranks highest — dry rain-shadow climate, no major streams, resort-grade wastewater. West Maui (Ka'anapali, Napili, Kapalua) ranks second — slightly wetter but still leeward. North Shore (Pa'ia, Ho'okipa) ranks lowest because it absorbs most Maui rainfall. Lahaina/Kahului has intermittent exposures from urban runoff.