Oʻahu water quality is worsening (-57pp in 14 days)
Oʻahu ocean water quality worsened 57 percentage points over the last 14 days (100% advisory-free two weeks ago vs. 43% advisory-free now).
For a trip in the next week, prioritize islands with stronger structural protection (dry coasts, reef enclosure, no major streams). See cleanest Hawaiian island and BWA alternatives.
Big Island has been mostly advisory-free — the same baseline as the prior two weeks. 0 of our 7 tracked beaches on the island recorded one or more advisory days in that 30-day history window. NOAA's 7-day forecast is dry, so the mostly advisory-free baseline should hold. See the Big Island leaderboard for the beach-by-beach ranking.
Maui has been mostly advisory-free — the same baseline as the prior two weeks. 0 of our 6 tracked beaches on the island recorded one or more advisory days in that 30-day history window. NOAA's 7-day forecast is dry, so the mostly advisory-free baseline should hold. See the Maui leaderboard for the beach-by-beach ranking.
Oʻahu is worsening over the last 14 days (-57pp vs. the prior two weeks). Our 12 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 wet (peak 51% chance of rain) — expect the pattern to shift toward more advisories. See the Oʻahu leaderboard for the beach-by-beach ranking.
Kauaʻi is worsening over the last 14 days (-14pp 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 wet (peak 55% chance of rain) — expect the pattern to shift toward more advisories. See the Kauaʻi leaderboard for the beach-by-beach ranking.
For the always-live per-island outlook, see our Hawaii Water Quality Forecast, which regenerates daily from NOAA + DOH data.
New report every day: trend per island, NOAA forecast, 30-day advisory-free leaders and most advisory-affected tracked beaches. Free — unsubscribe anytime.