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Hawaii Water Quality — July 30, 2026

Advisory cleared at Hanakaʻoʻo Beach Park — Maui coast continues recovering

BIG ISLAND
Still advisory-free (100% advisory-free)
MAUI
-36pp worsening
OʻAHU
-79pp worsening
KAUAʻI
-50pp worsening

1 tracked beach cleared DOH advisory status in the last 24 hours: Hanakaʻoʻo Beach Park. Bacteria can linger after visible turbidity clears, so the 72-hour waiting rule still applies if the advisory was rain-driven.

Where the islands stand today

Big Island

still advisory-free

Big Island has been persistently advisory-free — the same baseline as the prior two weeks. 0 of our 7 tracked beaches on the island have active advisory days in the last 30 days. NOAA's 7-day forecast is dry, so the persistently advisory-free baseline should hold. See the Big Island leaderboard for the beach-by-beach ranking.

Maui

worsening

Maui is worsening over the last 14 days (-36pp vs. the prior two weeks). 1 of our 6 tracked beaches on the island have active advisory days in the last 30 days. NOAA's 7-day forecast is dry, which should halt new advisory activity and let the existing advisories begin to clear. See the Maui leaderboard for the beach-by-beach ranking.

Oʻahu

worsening

Oʻahu is worsening over the last 14 days (-79pp vs. the prior two weeks). 1 of our 12 tracked beaches on the island have active advisory days in the last 30 days. NOAA's 7-day forecast is mild — scattered showers possible but unlikely to drive new advisories. See the Oʻahu leaderboard for the beach-by-beach ranking.

Kauaʻi

worsening

Kauaʻi is worsening over the last 14 days (-50pp vs. the prior two weeks). Our 6 tracked beaches happen not to overlap with the DOH advisories driving this signal — the worsening trend is from island-wide or other-area advisory events. NOAA's 7-day forecast is mild — scattered showers possible but unlikely to drive new advisories. See the Kauaʻi leaderboard for the beach-by-beach ranking.

NOAA 7-day forecast, per island tourist coast
  • Kohala Coast, Big Island: dry (max 13% chance of rain across next 7 days)
  • South Maui (Wailea / Kihei): dry (max 17% chance of rain across next 7 days)
  • South Shore O’ahu (Honolulu / Waikiki): mild (max 35% chance of rain across next 7 days)
  • Po’ipu, Kaua’i: mild (max 42% chance of rain across next 7 days)

For the always-live per-island outlook, see our Hawaii Water Quality Forecast, which regenerates daily from NOAA + DOH data.

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Methodology: Statistics in this report come from our pipeline's aggregation of Hawaii DOH Clean Water Branch advisory data across 31 tracked beaches (last 14 days compared against the 14 days before). Forecast data from NOAA National Weather Service (api.weather.gov) sampled at each island's primary tourist coast. All numbers accurate as of publication. This report describes water-quality trends and forecast; it is not a swim recommendation. Physical hazards (shore break, rip currents, surf, marine life) are independent of water quality. Always check the individual beach page and local conditions before entering the water.