Worst flooding in two decades swamps Oahu, triggers federal aid request

Overview

Updated May 30

A slow-moving Kona low drenched Oahu beginning March 17, unleashing the worst flooding Hawaii has seen in over twenty years. Flash floods tore across the North Shore and southern reaches of the island, forcing thousands to evacuate and triggering rescue operations that pulled more than 230 people to safety. Damage estimates now exceed $1 billion.

Governor Josh Green formally requested a presidential major disaster declaration from the Trump administration, seeking a 90% federal cost share—Washington covers nine of every ten recovery dollars. FEMA has deployed damage-assessment teams with state crews, but the declaration hasn't been approved. The gap between request and approval is where the political and fiscal stakes now sit.

Why it matters

A billion-dollar recovery hinges on whether Washington approves the disaster declaration and at what cost share.

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Key Indicators

$1B+

Estimated damage

Preliminary damage estimate across Oahu from flooding, infrastructure failure, and property loss.

230+

People rescued

Individuals pulled from floodwaters by emergency responders since March 17.

90%

Requested federal cost share

The portion of recovery costs Governor Green is asking the federal government to cover.

20+ years

Since comparable flooding

The worst flooding Hawaii has experienced since at least 2006.

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People Involved

Josh Green

Governor of Hawaii

Leading state response; submitted federal disaster declaration request

Organizations Involved

Federal Emergency Management Agency (FEMA)

Federal Agency

Conducting damage assessments on Oahu

The federal agency responsible for coordinating disaster response and administering aid after presidential disaster declarations.

Hawaii Emergency Management Agency (HI-EMA)

State Agency

Coordinating evacuations and rescue operations

Hawaii's state-level emergency management agency, responsible for coordinating disaster preparedness, response, and recovery across the islands.

Timeline

5 events Latest: March 24th, 2026 · 5 months ago

Tap a bar to jump to that date

March 2026
Governor Green requests presidential major disaster declaration
Latest Political

Governor Josh Green formally submitted a request to the Trump administration for a presidential major disaster declaration, seeking a federal cost share of up to 90%. FEMA deployed damage-assessment teams to work alongside state crews.
March 24th, 2026
Damage estimates surpass $1 billion
Assessment

Preliminary damage assessments indicated total losses exceeding $1 billion, accounting for residential and commercial property damage, road and infrastructure failures, and agricultural losses.
March 22nd, 2026
Flooding spreads to southern Oahu, rescue operations intensify
Emergency Response

Flooding expanded to southern regions of Oahu. Rescue teams conducted water rescues across multiple neighborhoods, ultimately saving more than 230 people over the course of the event.
March 20th, 2026
Flash flooding hits North Shore, evacuations begin
Emergency Response

Flash floods struck Oahu's North Shore communities. Emergency services began evacuating residents from low-lying areas as streams and rivers overflowed.
March 18th, 2026
Kona low parks over Oahu, heavy rainfall begins
Weather Event

A slow-moving Kona low weather system settled over the Hawaiian Islands, bringing sustained heavy rainfall to Oahu. Flash flood warnings were issued for multiple areas.
March 17th, 2026

Historical Context

3 moments from history that rhyme with this story — and how they unfolded.

September 1992

Hurricane Iniki (1992)

Hurricane Iniki struck Kauai as a Category 4 storm, the most powerful hurricane to hit Hawaii in recorded history. It destroyed over 1,400 homes and damaged 5,000 more, causing $3.1 billion in damage (in 1992 dollars). The storm killed six people and left much of Kauai without power for months.

Then

President George H.W. Bush declared a major disaster immediately. Federal aid flowed quickly, partly because the disaster occurred during an election year.

Now

Iniki reshaped Hawaii's building codes and insurance markets. It remains the benchmark against which major Hawaiian natural disasters are measured.

Why this matters now

Iniki set the precedent for large-scale federal disaster response in Hawaii. The current flooding, while different in character, approaches Iniki-level damage estimates when adjusted for inflation, underscoring the scale of the recovery challenge.

April 2018

Kauai Floods (2018)

Nearly 50 inches of rain fell on Kauai's north shore over 24 hours in April 2018, triggering catastrophic flooding and landslides that cut off the town of Wainiha. Hundreds of homes were damaged or destroyed, and major roads were washed out, leaving communities isolated for months.

Then

Governor David Ige secured a federal disaster declaration. FEMA provided over $38 million in aid. Some residents were displaced for more than a year.

Now

Kuhio Highway repairs took years and cost over $100 million. The event highlighted the vulnerability of Hawaii's coastal communities and single-road-access areas to extreme rainfall.

Why this matters now

The 2018 Kauai floods are the closest recent precedent for catastrophic Hawaiian flooding and a federal disaster response. The current Oahu event is far larger in economic terms, affecting a much more populated island.

August 2023

Maui Wildfires (2023)

Wind-driven wildfires destroyed the historic town of Lahaina on Maui, killing over 100 people and causing an estimated $5.5 billion in damage. It was the deadliest U.S. wildfire in more than a century. Governor Green led the state response and navigated a complex federal aid process.

Then

President Biden approved a major disaster declaration within days. FEMA faced criticism for slow initial distribution of aid. Thousands of residents were displaced into hotels and temporary housing.

Now

The disaster reshaped Hawaii's approach to emergency management, prompted reforms to warning systems, and left lasting questions about rebuilding in high-risk areas. Federal aid distribution remained contentious more than a year later.

Why this matters now

The Maui disaster is the most recent test of Hawaii's relationship with FEMA and federal disaster aid. Governor Green's experience navigating that process — including its frustrations — directly shapes his approach to the current flooding declaration request.