Project Lead

County of Maui Department of Environmental Management

Project Website

Project Type

Infrastructure

Plan Alignment

Lahaina LTRP

One Water Lahaina (OWL)

Funding Sources

EPA

Brief Description:

This project will plan, design, and build a new sewer system in Wahikuli to replace cesspools serving approximately 231 households, improving wastewater management and supporting community recovery.

Milestones:

June 2025: Final Environmental Assessment and Finding of No Significant Impact (EA/FONSI) completed, prepared jointly by the EPA and the County of Maui.
February 2026: Design 100% complete under EPA mission assignment.
‍
Project is shovel-ready and the County is pursuing funding for construction activities. $3M is available for household laterals, septic conversions, and other activities, as presented in May 2026 Lahaina Community Meeting.

Final Environmental Assessment and Finding of No Significant Impact (EA/FONSI): https://files.hawaii.gov/dbedt/erp/Doc_Library/2025-07-08-MA-FEA-Wahikuli-Subdivision-Gravity-Sewer-System.pdf

Project Location:

Additional Resources:

Final Environmental Assessment and Finding of No Significant Impact (EA/FONSI): https://files.hawaii.gov/dbedt/erp/Doc_Library/2025-07-08-MA-FEA-Wahikuli-Subdivision-Gravity-Sewer-System.pdf

“Connect Wahikuli to the county sewer system. Provide more public information and education on wastewater improvement plans in Wahikuli.”

Community Quote Neighborhood Workshop

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NATURAL & CULTURAL RESOURCES

HOUSING

INFRASTRUCTURE

COMMUNITY PLANNING

ECONOMIC DEVELOPMENT

HEALTH & SOCIAL SERVICES

Wahikuli Subdivision Gravity Sewer System

participation

Inform

Complexity

High

Cost

High

Phase

Design

Kuleana

County

State

County & State

Private

timing

1-2 years

6+ years

3-5 years

Estimated
completion

Lahaina Royal Complex Master Plan

The County of Maui Department of ʻŌiwi Resources is currently working with Group 70 International, Inc. (G70) to develop the Lahaina Royal Complex Master Plan. The project scope includes hydrology and water policy; wildfire resiliency and risk planning; biological and ecological assessment; cultural landscape architecture; community engagement protocol; transportation circulation planning; topographical survey; cultural and archaeological studies; soils and geotechnical studies; and boundary mapping.

View Presentation

Priority Cesspools in Wahikuli Houselots Subdivision

“Connect Wahikuli to the county sewer system. Provide more public information and education on wastewater improvement plans in Wahikuli.”

Community Quote Neighborhood Workshop

Purpose

The enhancement of existing wastewater infrastructure in Lahaina following the August 2023 wildfires, as well as the U.S. Environmental Protection Agency (EPA) Technical Assistance, will provide for more sustainable wastewater management and enhance resident quality of life, promote sustainable economic development, and reduce economic burden on residents returning to their homes.

Project Description

This project will make enhancements to the existing wastewater infrastructure in Lahaina, including planning, design and construction of a proposed gravity sewer system to service approximately 231 households, currently serviced by cesspools. The EPA is providing direct technical assistance to support the County, including the County Department of Environmental Management, Department of Public Works and others, as needed, by developing documents necessary for construction. The intent of this technical assistance is to deliver the project “shovel-ready” to the County for construction implementation. The EPA’s Technical Assistance period of performance is approximately 18 months from contract award date.

Interdependencies and Roadblocks

Lack of funding for construction at the time of writing, compliance with State and federal cross cutters, and applicable County regulations are current roadblocks to implementation of this project. Additional efforts will be needed to incorporate the EPA’s sewer project into a parallel U.S. Army Corps of Engineers (USACE) project in the same vicinity, making sure the designs are prepared in collaboration and navigating the rebuild at the same time as the County is asking for EPA to assist with retainment of easements.

Contact

Project Details

Cost Estimate:

$25 million

Existing Funding Sources:

County DWS Capital Revolving Fund
DEM pursuing EPA Community Change Grant funding for construction
FEMA Mission Assignment to EPA for planning and design

Project Lead:

County of Maui Department of Environmental Management

Potential Funding Sources:

Exploring need for Interagency Reimbursable Work Agreement between EPA and FEMA
Improvement District Program
USACE Planning Assistance to States

Project Partners:

State Department of Health
U.S. Environmental Protection Agency

Alignment with West Maui Community Plan (WMCP)

Goal 2.1 Ready and resilient systems
Action 1.07 Work with the State Department of Health, Clean Water Branch to identify next steps in addressing the impact of sea level rise on on-site disposal systems (i.e., cesspool and septic systems), and develop remediation plans.

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Clear Search

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Wahikuli Subdivision Gravity Sewer System

Project Lead

Project Type

Plan Alignment

Funding Sources

Brief Description:

Milestones:

Project Location:

Additional Resources:

“Connect Wahikuli to the county sewer system. Provide more public information and education on wastewater improvement plans in Wahikuli.”



BACK TO ALL PROJECTS

Wahikuli Subdivision Gravity Sewer System

1-2 years

6+ years

3-5 years

Lahaina Royal Complex Master Plan

“Connect Wahikuli to the county sewer system. Provide more public information and education on wastewater improvement plans in Wahikuli.”

Purpose

Project Description

Interdependencies and Roadblocks

Contact

Project Details

Cost Estimate:

Existing Funding Sources:

Project Lead:

Potential Funding Sources:

Project Partners:

Alignment with West Maui Community Plan (WMCP)

Explore projects

Lahaina Bypass Phase 1C

Lahaina Royal Complex

Lahaina Harbor Restoration

Enhance Emergency Communication Networks

Ke Ola Hou

Kuhua Street Extension

Maui Emergency Management Agency (MEMA) Advancement Program

National Historic Landmark District Update

R-1 Recycled Water Expansion

West Maui Greenway

Rebuild the West Maui Senior Center

Stormwater Resilience and Flood Risk Management

Street Connectivity and Extensions

Watershed Planning for Revegetation & Reforestation of Lahaina & Kula

Water Source Development

Affordable Rental Housing Programs

Energy Resilience and Redundancy

Wildfire Risk Reduction and Mitigation

Agriculture Planning & Long Term Food Security

Asset Management and Acquisitions Program

Building Resilience Incentives

Creation of Lahaina Memorial

Community Facilities

Comprehensive Environmental Monitoring and Sampling Plan (CEMSP)

Economic Innovation and Development

Green Workforce Development

Healthcare Service Expansion

Homeowner Support Programs

Maui County Ferry

Lahaina Business Project

Lahaina Water Infrastructure Firefighting Capacity

Long-Term Disaster Case Management Program (DCMP)

Lahaina Water Infrastructure Resilience and Hardening

Preservation, Revitalization, and Reconstruction of Historic and Cultural Spaces

West Maui Business Center (WMBC)

West Maui Hospital