DOH Releases New North Shore Flood Contamination Data

Department of Health advises ongoing precautions for communities affected by recent Kona Low storms

Apr. 9, 2026 at 3:38am

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A ghostly, translucent X-ray image revealing the internal structure of flood-contaminated mud, with faint outlines of bacteria and other pathogens, conceptually illustrating the hidden health risks in the aftermath of a major storm.An X-ray view into the unseen dangers lurking in flood-affected mud and sediment, underscoring the need for caution and protective measures.Honolulu Today

The Hawaiʻi Department of Health (DOH) has released additional test results from mud and sediment samples collected in North Shore areas impacted by recent Kona Low storms. The samples detected the presence of several types of bacteria, including Staphylococcus aureus, Clostridium perfringens, and Leptospira, in addition to previously announced findings of E. coli, Enterococcus, and Salmonella. DOH is advising residents to take precautions when handling flood-affected mud, soil, or standing water to prevent potential health risks.

Why it matters

The presence of these contaminants in flood-carried mud and sediment is common after major storm events, but testing is not routinely conducted. These findings underscore the need for ongoing community vigilance and protective measures to mitigate health risks, especially as Hawaii continues to experience severe weather patterns.

The details

Initial samples were collected from three sites where mud from impacted North Shore communities is being consolidated, as well as one floodwater drainage site. The samples were tested for a range of bacteria and pathogens typically found in floodwaters and associated mud, including E. coli, Salmonella, Enterococcus, Hepatitis A, Staphylococcus aureus, Campylobacter, Clostridium perfringens, Clostridium tetani, and Leptospira. While Hepatitis A and Campylobacter were not detected, the presence of the other contaminants was confirmed.

  • The DOH released the additional test results on April 9, 2026.
  • The samples were collected in the aftermath of recent Kona Low storms that impacted the North Shore of Hawaii.

The players

Hawaiʻi Department of Health (DOH)

The state agency responsible for protecting public health and the environment in Hawaii.

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What’s next

DOH is awaiting additional sampling results for Clostridium tetani, legacy pesticides, and metals. The department continues to advise residents in affected areas to take precautions when handling flood-related mud, soil, or standing water.

The takeaway

These findings highlight the importance of community vigilance and protective measures in the aftermath of major storm events, as floodwaters can carry a range of harmful contaminants that pose health risks. As Hawaii faces more severe weather patterns, the state's public health agency remains committed to monitoring environmental conditions and providing guidance to keep residents safe.