Hanalei Wastewater Solution: Community Plan to Improve Water Quality on Kauai’s North Shore

The Hanalei community has been searching for a long-term solution to its wastewater challenges for decades. Today, that effort is gaining real momentum thanks to a comprehensive, yearlong planning study led by the nonprofit Hanalei Initiative—and what’s being proposed could mark a meaningful turning point for the North Shore.

At the heart of the recommendation is a liquid-only pressure sewer system, estimated to cost approximately $19 million. This approach was selected not only for its cost efficiency, but for its environmental benefits and sensitivity to the cultural landscape that defines Hanalei.

Unlike traditional sewer systems, this model separates solids at each property using a septic tank, then pumps only liquid wastewater to a centralized treatment facility.

Why This System Stands Out

This approach offers several key advantages:

• Compatibility with existing septic and aerobic systems, allowing many homeowners to reuse current infrastructure
• Improved environmental performance and water quality outcomes
• Minimal ground disturbance—critical in culturally sensitive areas

According to Joel Guy, Executive Director of the Hanalei Initiative:

“Ideally, we would like to connect to the Princeville Wastewater Treatment Plant. We’ve had meaningful conversations with Princeville. Tying into an existing system gives us the ability to minimize disturbance to sensitive lands.”

The Initiative is currently exploring funding options, including issuing a bond or securing a federal grant support to bring the project to life.

Protecting What Matters Most

Hanalei is not just a place of extraordinary natural beauty—it is also deeply rooted in Native Hawaiian culture. Historically, iwi kūpuna (ancestral remains) were often buried in sand dunes, yards, and areas close to home. These sites remain present throughout the community today.

The proposed system’s ability to minimize excavation and soil disturbance is a critical factor. In a place like Hanalei, cultural preservation and land stewardship are inseparable, and any infrastructure solution must respect both.

The Bigger Picture: Water Quality in Hanalei

Since 2004, Hanalei Bay and its four primary streams—Hanalei, Waiʻoli, Waipa, and Waikoko—have consistently been listed as impaired due to elevated levels of Enterococcus bacteria, a fecal indicator.

These are the waters where residents and visitors alike surf, fish, swim, boat, and gather.

Clean water is not only an environmental issue, but it is central to the health, lifestyle, and identity of Hanalei.

As Joel Guy noted:
“We need to recognize there is a real issue with unfiltered wastewater entering Hanalei. As a community, we have to come together and ask—what can we do about it?”

Moving Away from Cesspools

For generations, cesspools have been the default wastewater solution across Hawaiʻi. However, with tens of thousands still in use statewide, the environmental impact has become impossible to ignore.

In response, Act 125 (2017) requires all cesspools in Hawaiʻi to be upgraded, converted, or connected to sewer systems by 2050.

In Hanalei alone, an estimated 150 homes are still operating cesspools, contributing to ongoing water quality concerns. Unlike modern systems, cesspools release untreated wastewater directly into the ground—introducing bacteria, viruses, nitrogen, and phosphorus into fragile ecosystems.

For those interested in understanding the scope of the issue, the Hanalei Initiative provides a helpful map outlining cesspool locations from Hāʻena to Hanalei.

What This Means for Homeowners and Buyers

As a real estate professional with over 20 years of experience in Hawaiʻi, I’ve seen firsthand how critical wastewater systems are—not just for regulatory compliance, but for protecting our shared resources.

Wastewater inspections are an essential part of due diligence in any real estate transaction.

Whether buying or selling, understanding the condition and type of system on a property is key:

For Sellers:

• Regular pumping, inspection, and maintenance help protect property value
• Proactive care leads to smoother transactions and fewer surprises

For Buyers:

• Inspections provide clarity on future costs and potential upgrades
• Ensures a responsible investment in both property and environment

Balancing infrastructure, environment, and culture isn’t easy, but Hanalei is showing what’s possible when a community comes together.

This is more than a wastewater solution, It’s a commitment to protecting the future of Hanalei.