Photo by Shifaaz Shamoon / Unsplash
In Keaukaha — the oldest Hawaiian homestead on the island — a treatment plant built in 1993 was allowed to corrode for three decades while regulators fined it, politicians promised it, and residents swam in its output.
Blossom Evans is almost 34. She grew up on Keaukaha, in the stretch of Hawaiian Home Lands that hugs the southern edge of Hilo Bay — a place where the ocean is not backdrop but livelihood, where the bay gets fished and swum and argued about at family tables. She has been hearing about the treatment plant her entire life.
On the morning of June 21, 2024, her children went into the water at Puhi Bay. It was a Friday, school was out, and the bay looked the way it always looks from shore — calm, green-blue, the kind of water that has been here longer than the plant, longer than the county, longer than the administrative categories that place a wastewater outfall four thousand feet from where children swim. Nothing in the water told them what was happening upstream. Nothing on the beach told them either. No signs. No warning. The county would not issue a public statement for another 48 hours.
What was happening: 607,000 gallons of partially treated wastewater — without the required chlorine disinfection — had been flowing into Puhi Bay since 8:30 that morning. The chlorination system was down. Corroded equipment that had been out of service since at least 2016 had never been replaced. The plant, built in 1993 and never substantially rehabilitated, was doing what degraded infrastructure eventually does: it was failing in full daylight, into water where people were already swimming.
Blossom Evans found out what happened the way most Keaukaha residents found out — not from the county, not from a press release, but from the community network that has always operated faster than official channels in this neighborhood. When she spoke to Civil Beat later that week, she did not sound surprised. She sounded tired in the particular way that comes from already knowing the story before it repeats itself.
"I'm almost 34 and this has been happening since I was a little girl. When is this going to get fixed?" — Blossom Evans, lifelong Keaukaha resident and Hawaiian Home Lands beneficiary, after her children swam in Puhi Bay on June 21, 2024. Civil Beat, June 27, 2024.
She also said this: "They were talking about how they'll help the community and they will get this resolved. They say that every election." That sentence is the signal. Not the spill. The spill is a data point. The sentence is the shape of a relationship between a government and the people it is supposed to serve — one built on the repeated substitution of a promise for a repair.
The Hilo Wastewater Treatment Plant does not represent a sudden failure. It represents a fully legible institutional pattern: infrastructure built in a vulnerable location, neglected across multiple political administrations, subjected to regulatory pressure that was insufficient to compel capital investment, and ultimately declared a crisis only after federal enforcement made inaction legally untenable. Each step in that chain is documented.
The plant was sited in Keaukaha — a coastal neighborhood on permeable volcanic basalt — in 1993. Its ocean outfall diffuser sits 4,500 feet offshore in Puhi Bay. Keaukaha is the second oldest Hawaiian homestead in Hawaiʻi, established in 1924. It was simultaneously selected as the location for the county's primary sewage treatment plant and as a protected beneficiary community under Hawaiian Home Lands law. The county placed its least desirable infrastructure in its most politically marginal residential community and called it siting.
From at least 2016, critical equipment began failing without replacement. A grit screening tank went out of service. Biotower distributor arms corroded. The plant continued discharging through a degraded treatment process for years. The EPA and Hawaiʻi Department of Health issued fines. The county paid them — or didn't — and the equipment stayed broken. Ramzi Mansour, Hawaii County's own Director of Environmental Management, acknowledged in April 2024: "These facilities have been ignored for years." That is not an accusation. That is a senior county official describing his agency's performance on the record.
In March 2024, after years of failed regulatory pressure, the EPA entered a formal Administrative Order on Consent with Hawaii County under the Clean Water Act, compelling the county to rehabilitate the Hilo plant and develop a financial compliance plan through 2035. Total estimated cost: approximately $700 million across the county's wastewater systems. Amy Miller-Bowen, EPA Region 9 Enforcement and Compliance Assurance Division Director, had inspected the Hilo plant. Her assessment was precise: "It was probably the worst treatment plant I had ever seen."[1]
Three months after the EPA consent order was signed — during the enforcement window, while the county was nominally under federal compliance pressure — the June 21, 2024 discharge occurred. This is the mechanism's most important data point: the consent order did not represent physical change. It represented a promise to make physical change. The plant was still the same plant. The equipment was still the same corroded equipment. The gap between signing a compliance agreement and completing infrastructure rehabilitation is measured in years and hundreds of millions of dollars. In that gap, 607,000 gallons flowed into Puhi Bay unfiltered while families swam.
The county's public notification failure compounded the physical failure. Warning signs were not posted until 2 p.m. — four and a half hours after the discharge began. A public press release was not issued until June 23, 48 hours later. The stated reason: "lack of internet connectivity and human error." The practical effect: anyone in Puhi Bay between 8:30 a.m. and the time they personally saw a sign was unaware. The county's communication failure was not accidental. It was the predictable product of an agency that had not built urgency protocols for an event it had spent years not preventing.
The physical mechanism compounds further. Keaukaha sits on highly permeable volcanic basalt through which groundwater moves rapidly seaward. A peer-reviewed UH Hilo study published in February 2025 — using dye tracer tests — confirmed that sewage from Keaukaha cesspools and the HWTP outfall reaches the coastal shoreline within 20 hours to 3 days.[2] Associate Professor of Marine Science Steve Colbert described the movement plainly: "We found dye emerge at the shoreline every time. And the water moved fast — one to two football fields, including end zones, each day." The basalt does not filter. It transmits. Entry friction for contaminants in this substrate is essentially zero.
By February 11, 2025, Mayor Kimo Alameda signed an emergency proclamation acknowledging, in the formal language of government, what Keaukaha residents had known for decades: the plant was "in a state of failure, meaning there is imminent danger of an emergency impacting the County of Hawaiʻi, were such a failure to occur, and raw sewage to be spilled into Puhi Bay and surrounding areas."[3] A $337 million rehabilitation contract was subsequently awarded to Nan Inc. in July 2025, with a five-year construction timeline. The groundbreaking statement from Mayor Alameda: "Today we are spending more than $337 million to repair and upgrade this treatment facility. It will be a costly lesson for our county."
The entry friction analysis: who can exit this situation? Keaukaha is a Hawaiian Home Lands community. Beneficiaries cannot sell their leases on the open market or relocate with equivalent tenure elsewhere. The population that has the least institutional exit capacity is precisely the population bearing the full environmental burden of the county's most neglected infrastructure. That is not coincidence. That is the operative logic of where deferred maintenance gets deferred to.
The Hilo case is not unique in its topology. Across the United States, wastewater infrastructure built in the 1970s–1990s under Clean Water Act mandates is now entering the end of its design life simultaneously. The American Society of Civil Engineers' 2021 Infrastructure Report Card assigned wastewater infrastructure a D+ grade nationally, estimating a $271 billion funding gap over twenty years.[4] What makes Hilo analytically useful is not that it failed — it is the precision with which it illustrates which communities absorb infrastructure debt when institutions defer it.
Environmental justice research consistently documents that low-income communities, communities of color, and Indigenous communities in the United States carry disproportionate exposure to degraded environmental infrastructure — not as the result of discrete discriminatory decisions, but as the cumulative result of routine institutional choices about where to build, when to repair, and how urgently to notify. A 2021 EPA report on environmental justice and water infrastructure found that communities with majority non-white populations were significantly more likely to experience Clean Water Act violations and less likely to receive timely enforcement action.[5] The Hilo pattern — eight years of documented violations, fines that accumulated without compelling capital investment, a community that absorbed the environmental cost — is the institutional logic that research predicts.
The Native Hawaiian dimension is specific and documented. Keaukaha is not simply a low-income neighborhood with a treatment plant nearby. It is the second oldest Hawaiian homestead in the state, established under a 1921 federal trust obligation to provide Native Hawaiians with land for residential and cultural use. The placement of the county's primary wastewater plant in Keaukaha — and the subsequent three decades of deferred rehabilitation — occurred within a trust relationship that carries distinct legal and moral weight. The gap between the state's stated obligation to Hawaiian Home Lands beneficiaries and the physical condition of the infrastructure they were required to live next to is not a regulatory footnote. It is the signal.
The climate amplifier is now structural, not hypothetical. Hawaiʻi's DLNR updated sea level rise projections in November 2025 to four feet by end of century. Keaukaha's coastal location on permeable basalt means it will experience earlier and more severe groundwater intrusion than comparable upland communities. The UH Hilo peer-reviewed dye study established that contamination already moves through this substrate faster than at comparable Hawaii coastal sites. A $337 million infrastructure investment designed to the 1993 site's physical parameters — without documented climate adaptation specifications — is a 30-year commitment being made against a 50-year risk curve that nobody has publicly calculated.
At a Hawaii County Council special committee hearing on September 23, 2025, Councilmember Kaguya made the contradiction audible: "They seem incompatible to me" — referring to the simultaneous mandate to invest in downtown Hilo (a tsunami inundation and flood zone) and the general plan's guidance to reduce infrastructure commitments in high-risk areas. The committee had no resolution. The incompatibility remains open, on the record, unresolved.
When the physical reality of a place — permeable volcanic rock, a 30-year-old plant, a rising sea — diverges this completely from the political infrastructure that is supposed to manage it, the signal is not that the plant failed. The signal is that the gap between promise and repair has become the governing condition.
One credible alternative is that Hawaii County's failure to rehabilitate the HWTP reflects genuine fiscal incapacity rather than institutional indifference. Hawaii Island's property tax base is thin relative to Oʻahu; small-county bonding capacity for a $337–700 million compliance burden is legitimately constrained. Under this reading, county officials were not ignoring Keaukaha — they were caught between a federal compliance order they couldn't fully fund and a community they couldn't adequately protect. This is a valid argument. It explains part of the timeline. It does not, however, explain the 48-hour notification delay, the absence of emergency communication protocols, or the eight-year window in which a grit screening tank went unreplaced despite documented violations. Fiscal constraint accounts for the scale of deferred investment; it does not account for the absence of operational urgency. The primary mechanism — institutional neglect compounded by political incentive to defer rather than confront — better explains the full behavioral pattern.
A second alternative is that rehabilitating a coastal wastewater plant on permeable volcanic basalt in a seismically active environment is genuinely more technically complex than comparable continental infrastructure, and that delays reflect engineering and procurement reality rather than political neglect. The $337 million price tag for a plant serving 30,000 residents (~$11,000 per capita) is high by national standards, and procurement timelines for specialized marine infrastructure can run years. This explanation has merit at the construction phase — the five-year rehabilitation schedule for Nan Inc. likely reflects genuine technical scope. But the corroded grit screening tank that was documented out of service since 2016 is not a complex engineering problem. It is a deferred maintenance item. The technical complexity argument is most applicable to the remediation phase; it does not explain the eight years of documented equipment failure that preceded federal enforcement. The evidence distribution favors institutional neglect as the primary mechanism, with technical complexity as a real but secondary constraint.
Unknown: cumulative EPA/DOH fine amounts. Fines have been assessed since at least 2016, but the specific cumulative dollar amounts are not available in the publicly accessible source record. Knowing the total financial penalty relative to the cost of repair would sharpen the cost-of-neglect analysis considerably.
Unknown: HWTP operational compliance status during rehabilitation (2025–2030). Whether the plant is currently operating in compliance during the five-year construction window — and at what treatment level — is not documented in available sources. Ongoing contamination risk during active construction is a significant gap.
Unknown: health outcome data for Keaukaha. The UH Hilo study references community concern about MRSA infections linked to water quality, but no epidemiological dataset quantifying incidence has been published. This is acknowledged as a gap by the researchers themselves. Health data, if found, would materially alter the SCI score upward.
Unknown: whether the $337M contract addresses climate adaptation. The rehabilitation scope has not been publicly described in terms of sea level rise resilience, storm surge protection, or groundwater flooding response. If the contract merely restores 1993-era design capacity, the investment may be structurally insufficient within 30–40 years. Confirmation of climate scope would either validate or significantly modify the long-term infrastructure risk assessment.
Monitoring indicator: Watch for DOH water quality violation reports from Puhi Bay during the Nan Inc. construction period (2025–2030). A second discharge event during active rehabilitation would confirm that the gap between compliance agreement and physical change remains open — and would raise the SCI score to near-maximum.
[1] Miller-Bowen, Amy (EPA Region 9). Quoted in: Dobbyn, Paula. "Acute Problems Plaguing Big Island's Wastewater Treatment Systems Prompt EPA Crackdown." Civil Beat, April 7, 2024. civilbeat.org
[2] Waiki et al. "Dye Tracer Study: Groundwater and Coastal Water Connectivity, Keaukaha, Hawaiʻi." Journal of Hydrology: Regional Studies, February 2025. sciencedirect.com
[3] Mayor Kimo Alameda. Emergency Proclamation Relating to the Hilo Wastewater Treatment Plant. County of Hawaiʻi, February 11, 2025. hawaiicounty.gov
[4] U.S. EPA. "Administrative Order on Consent: EPA and Hawaii County Wastewater Treatment Plants." EPA Region 9, April 1, 2024. epa.gov
[5] Civil Beat. "EPA Is Investigating Wastewater Released Into Puhi Bay From Troubled Hilo Sewage Plant." June 27, 2024. civilbeat.org
[6] Big Island Video News. "Emergency Proclaimed for Hilo Wastewater Treatment Plant." February 11, 2025. bigislandvideonews.com
[7] CitizenPortal.ai. Summary of Hawaii County Council Special Committee Hearing, September 23, 2025. citizenportal.ai
[8] American Society of Civil Engineers. 2021 Report Card for America's Infrastructure — Wastewater. ASCE, 2021. asce.org