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Raw Sewage Sneaking Into West Hawaii’s Coastal Waters Threatens Coral Reefs and Public Health, Scientists Find – Inside Climate News

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Raw Sewage Sneaking Into West Hawaii’s Coastal Waters Threatens Coral Reefs and Public Health, Scientists Find – Inside Climate News


For generations, West Hawaii’s picturesque coastlines have been a gathering place for fishing, swimming and ceremony. But those sacred waters are also gathering something else. 

Using airborne mapping, field sampling and advanced statistical analysis, researchers at Arizona State University’s Center for Global Discovery and Conservation Science in Hawaii revealed that nearly half of West Hawaii’s coastline is being quietly contaminated with raw sewage.

As a result, coral reefs in bays like Hōnaunau are struggling to flourish, weakening ecosystems that people rely on for food, and harming their ability to protect coastline communities from erosion and rising sea levels. The sewage-contaminated ocean water not only threatens the environment but also exposes swimmers to E. coli, salmonella and other pathogens or parasites that sicken people.

The researchers collected water samples from 47 shoreline sites in the South Kohala, North Kona and South Kona regions. Of those sites, 42 percent had elevated levels of a bacteria that indicates sewage contamination, and the levels were high enough in nearly a quarter of the sites to threaten both the environment and human health, their study found. 

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“The most alarming thing was how consistently we found contamination at popular swimming sites, places where families take their kids,” said Kelly Hondula, associate research scientist at the Center for Global Discovery and Conservation Science and lead author of the study. “Some of these sites regularly test above public-health thresholds, meaning swimming there poses a higher risk of disease.” 

Cesspools and leaky septic tanks are a key reason for the water contamination, the researchers say.

Hawaii banned the creation of new cesspools in 2016, the last U.S. state to do so. But 

more than 88,000 cesspools, which Hawaii’s Department of Health describes as “little more than holes in the ground,” still operate in the state. Each day, homes and businesses using this inexpensive but ineffective form of waste management discharge more than 53 million gallons of untreated sewage. 

Andrea Kealoha, an assistant professor of marine biology and geochemistry at the University of Hawaiʻi at Mānoa, who wasn’t involved with the new study, notes that the use of injection wells in the state also contributes to sewage contamination in water.

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“They take the wastewater, all of the wastewater, to facilities in a community, they treat that water, but they don’t really remove the nutrients or the other pollutants,” she said. 

What makes the West Hawaii region so vulnerable to coastline contamination is a phenomenon known as submarine groundwater discharge. West Hawaii is built upon the young lava flows of the Hualālai and Mauna Loa volcanoes. The hardened lava, once fluid, has dried up and is filled with cracks, tubes and voids. When homes, businesses and wastewater management plants discharge wastewater into the ground from cesspools, septic tanks or injection wells, it quickly travels through the lava tubes and fractures, emerging under the coast’s tideline. 

That process disperses the substances carried along with the waste. Among them is nitrogen, a nutrient that helps plants grow but in higher concentrations can harm marine ecosystems. In such conditions, it’s harder for coral reefs to reproduce and recover after incidents like bleaching. 

Coral reefs are seen in declining health in the waters near Puako, Hawaii. Credit: Greg Asner/ASU
Coral reefs are seen in declining health in the waters near Puako, Hawaii. Credit: Greg Asner/ASU

“The nitrogen that leaks out into the ocean from groundwater contamination and into the reef system stimulates the growth of algae, the kind of algae that grows on the sea floor, like a weed. And that algae overtakes the coral,” said Greg Asner, director of Arizona State University’s Center for Global Discovery and Conservation Science and senior author of the study.

When that algae dies and decomposes on the coastline floor, it consumes oxygen in the water. Too much of that leaves fish and invertebrates unable to survive. 

“If we continue on the pathway of not taking action, not improving water quality, we’re going to see more ecosystem loss,” said Jasmine Fournier, executive director of the Ocean Sewage Alliance, which aims to reduce the waste contamination problem. “The things we expect when we go into the water, we might not be seeing as much anymore. We’ll see more algal blooms, more fish kills, fishermen who can no longer maintain their livelihoods because the fish stocks are gone.” 

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A 2017 law requires all cesspools to be converted to more effective waste management by 2050, but Kealoha said ASU’s findings should prompt more action. 

“We have such a hard time as local communities to combat the whole greater climate issue—which comes with ocean warming and ocean acidification—but we do have power to combat these local stressors,” she said. 

About This Story

Perhaps you noticed: This story, like all the news we publish, is free to read. That’s because Inside Climate News is a 501c3 nonprofit organization. We do not charge a subscription fee, lock our news behind a paywall, or clutter our website with ads. We make our news on climate and the environment freely available to you and anyone who wants it.

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Mikee Quintos, Heaven Peralejo go on beach trip in Hawaii

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Mikee Quintos, Heaven Peralejo go on beach trip in Hawaii


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Mikee Quintos and Heaven Peralejo are having some tropical fun in Hawaii!

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On Instagram, Heaven shared photos from their beach getaway off the coast of Honolulu, along with snaps of them exploring the city.

“From Hawaii with love,” Heaven wrote.

In a separate Instagram post, Mikee also posted a photo of them eating in a restaurant in Oahu.

Mikee and Heaven have been spending time together lately, often traveling side by side. Prior to their Honolulu trip, the two travelled to Siargao, where they enjoyed free diving.

Mikee most recently starred in “Encantadia Chronicles: Sang’gre” as Lira.

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In 2025, she graduated from college after 10 years.

 

 

—Jade Veronique Yap/JCB, GMA News





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Hawaii DOH warns of raw milk cheese recall over E. coli | Honolulu Star-Advertiser

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Hawaii DOH warns of raw milk cheese recall over E. coli | Honolulu Star-Advertiser


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The Hawaii Department of Health is alerting residents to a nationwide raw milk cheddar cheese recall due to potential contamination with E. coli.

The recall is for RAW FARM brand cheddar cheese, including both shredded and block products, after federal investigations found they may be contaminated with E. coli O157:H7.

DOH says the products were distributed to a small number of specialty grocery stores in Hawaii, including Down to Earth and Hanalei Market and is following up to ensure they are no longer available for sale.

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The U.S. Food and Drug Administration requested RAW FARM of Fresno, Calif., issue the voluntary recall, and the business did so under protest.

The FDA continues to investigate a multi-state outbreak of E. coli O157:H7 infections linked to RAW FARM-brand faw dairy products.

The recalled products include:

>> 8 oz. lightly salted cheddar block, with expiration date 8/23/2026

>> 80 oz. lightly salted cheddar block, with expiration date 8/11/2026

>> 16 oz. lightly salted cheddar block, with expiration date 8/23/2026

>> 80 oz. bag of original cheddar shred, with expiration date 5/6/2026

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>> 16 oz. Jalapeno cheddar block, with expiration date 9/24/2026

>> 8 oz. lightly salted cheddar shred, with expiration date 5/13/2026

>> 8 oz. Jalapeno Cheddar Block, with expiration date 9/24/2026

Any batches produced prior to the dates listed above are also under recall.

As of today, nine people infected with the E. coli strain have been reported from three states, including California, Texas and Florida, according to the U.S. Centers for Disease Control and Prevention. Three have been hospitalized.

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More than half of illnesses are in children under age 5.

No illnesses or adverse events from the product have been reported in Hawaii.

Symptoms include severe stomach cramps, diarrhea, fever, nausea and/or vomiting. They can begin anywhere from a few days after consuming contaminated food to up to nine days later.

“Although most healthy adults can recover completely within a week, some infections can cause severe bloody diarrhea and may lead to life-threatening conditions such as a type of kidney failure called hemolytic uremic syndrome,” said DOH in a news release. “HUS is most likely to occur in young children and the elderly.”

Infections with this strain may also lead to the development of high blood pressure, chronic kidney disease, and neurologic problems.

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Anyone exhibiting symptoms after having consumed the recalled products should contact their health care provider immediately.

Consumers with questions may contact RAW FARM https://rawfarmusa.com/contact.




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State bills would raise tax on pricey Hawaii home sales | Honolulu Star-Advertiser

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State bills would raise tax on pricey Hawaii home sales | Honolulu Star-Advertiser




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